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/*!
 * QUnit 2.0.1
 * https://qunitjs.com/
 *
 * Copyright jQuery Foundation and other contributors
 * Released under the MIT license
 * https://jquery.org/license
 *
 * Date: 2016-07-23T19:39Z
 */

( function( global ) {

var QUnit = {};

var Date = global.Date;
var now = Date.now || function() {
        return new Date().getTime();
};

var setTimeout = global.setTimeout;
var clearTimeout = global.clearTimeout;

// Store a local window from the global to allow direct references.
var window = global.window;

var defined = {
        document: window && window.document !== undefined,
        setTimeout: setTimeout !== undefined,
        sessionStorage: ( function() {
                var x = "qunit-test-string";
                try {
                        sessionStorage.setItem( x, x );
                        sessionStorage.removeItem( x );
                        return true;
                } catch ( e ) {
                        return false;
                }
        }() )
};

var fileName = ( sourceFromStacktrace( 0 ) || "" ).replace( /(:\d+)+\)?/, "" ).replace( /.+\//, "" );
var globalStartCalled = false;
var runStarted = false;

var autorun = false;

var toString = Object.prototype.toString,
        hasOwn = Object.prototype.hasOwnProperty;

// Returns a new Array with the elements that are in a but not in b
function diff( a, b ) {
        var i, j,
                result = a.slice();

        for ( i = 0; i < result.length; i++ ) {
                for ( j = 0; j < b.length; j++ ) {
                        if ( result[ i ] === b[ j ] ) {
                                result.splice( i, 1 );
                                i--;
                                break;
                        }
                }
        }
        return result;
}

// From jquery.js
function inArray( elem, array ) {
        if ( array.indexOf ) {
                return array.indexOf( elem );
        }

        for ( var i = 0, length = array.length; i < length; i++ ) {
                if ( array[ i ] === elem ) {
                        return i;
                }
        }

        return -1;
}

/**
 * Makes a clone of an object using only Array or Object as base,
 * and copies over the own enumerable properties.
 *
 * @param {Object} obj
 * @return {Object} New object with only the own properties (recursively).
 */
function objectValues ( obj ) {
        var key, val,
                vals = QUnit.is( "array", obj ) ? [] : {};
        for ( key in obj ) {
                if ( hasOwn.call( obj, key ) ) {
                        val = obj[ key ];
                        vals[ key ] = val === Object( val ) ? objectValues( val ) : val;
                }
        }
        return vals;
}

function extend( a, b, undefOnly ) {
        for ( var prop in b ) {
                if ( hasOwn.call( b, prop ) ) {
                        if ( b[ prop ] === undefined ) {
                                delete a[ prop ];
                        } else if ( !( undefOnly && typeof a[ prop ] !== "undefined" ) ) {
                                a[ prop ] = b[ prop ];
                        }
                }
        }

        return a;
}

function objectType( obj ) {
        if ( typeof obj === "undefined" ) {
                return "undefined";
        }

        // Consider: typeof null === object
        if ( obj === null ) {
                return "null";
        }

        var match = toString.call( obj ).match( /^\[object\s(.*)\]$/ ),
                type = match && match[ 1 ];

        switch ( type ) {
                case "Number":
                        if ( isNaN( obj ) ) {
                                return "nan";
                        }
                        return "number";
                case "String":
                case "Boolean":
                case "Array":
                case "Set":
                case "Map":
                case "Date":
                case "RegExp":
                case "Function":
                case "Symbol":
                        return type.toLowerCase();
        }
        if ( typeof obj === "object" ) {
                return "object";
        }
}

// Safe object type checking
function is( type, obj ) {
        return QUnit.objectType( obj ) === type;
}

// Doesn't support IE9, it will return undefined on these browsers
// See also https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error/Stack
function extractStacktrace( e, offset ) {
        offset = offset === undefined ? 4 : offset;

        var stack, include, i;

        if ( e.stack ) {
                stack = e.stack.split( "\n" );
                if ( /^error$/i.test( stack[ 0 ] ) ) {
                        stack.shift();
                }
                if ( fileName ) {
                        include = [];
                        for ( i = offset; i < stack.length; i++ ) {
                                if ( stack[ i ].indexOf( fileName ) !== -1 ) {
                                        break;
                                }
                                include.push( stack[ i ] );
                        }
                        if ( include.length ) {
                                return include.join( "\n" );
                        }
                }
                return stack[ offset ];
        }
}

function sourceFromStacktrace( offset ) {
        var error = new Error();

        // Support: Safari <=7 only, IE <=10 - 11 only
        // Not all browsers generate the `stack` property for `new Error()`, see also #636
        if ( !error.stack ) {
                try {
                        throw error;
                } catch ( err ) {
                        error = err;
                }
        }

        return extractStacktrace( error, offset );
}

/**
 * Config object: Maintain internal state
 * Later exposed as QUnit.config
 * `config` initialized at top of scope
 */
var config = {

        // The queue of tests to run
        queue: [],

        // Block until document ready
        blocking: true,

        // By default, run previously failed tests first
        // very useful in combination with "Hide passed tests" checked
        reorder: true,

        // By default, modify document.title when suite is done
        altertitle: true,

        // HTML Reporter: collapse every test except the first failing test
        // If false, all failing tests will be expanded
        collapse: true,

        // By default, scroll to top of the page when suite is done
        scrolltop: true,

        // Depth up-to which object will be dumped
        maxDepth: 5,

        // When enabled, all tests must call expect()
        requireExpects: false,

        // Placeholder for user-configurable form-exposed URL parameters
        urlConfig: [],

        // Set of all modules.
        modules: [],

        // Stack of nested modules
        moduleStack: [],

        // The first unnamed module
        currentModule: {
                name: "",
                tests: []
        },

        callbacks: {}
};

// Push a loose unnamed module to the modules collection
config.modules.push( config.currentModule );

// Register logging callbacks
function registerLoggingCallbacks( obj ) {
        var i, l, key,
                callbackNames = [ "begin", "done", "log", "testStart", "testDone",
                        "moduleStart", "moduleDone" ];

        function registerLoggingCallback( key ) {
                var loggingCallback = function( callback ) {
                        if ( objectType( callback ) !== "function" ) {
                                throw new Error(
                                        "QUnit logging methods require a callback function as their first parameters."
                                );
                        }

                        config.callbacks[ key ].push( callback );
                };

                return loggingCallback;
        }

        for ( i = 0, l = callbackNames.length; i < l; i++ ) {
                key = callbackNames[ i ];

                // Initialize key collection of logging callback
                if ( objectType( config.callbacks[ key ] ) === "undefined" ) {
                        config.callbacks[ key ] = [];
                }

                obj[ key ] = registerLoggingCallback( key );
        }
}

function runLoggingCallbacks( key, args ) {
        var i, l, callbacks;

        callbacks = config.callbacks[ key ];
        for ( i = 0, l = callbacks.length; i < l; i++ ) {
                callbacks[ i ]( args );
        }
}

( function() {
        if ( !defined.document ) {
                return;
        }

        // `onErrorFnPrev` initialized at top of scope
        // Preserve other handlers
        var onErrorFnPrev = window.onerror;

        // Cover uncaught exceptions
        // Returning true will suppress the default browser handler,
        // returning false will let it run.
        window.onerror = function( error, filePath, linerNr ) {
                var ret = false;
                if ( onErrorFnPrev ) {
                        ret = onErrorFnPrev( error, filePath, linerNr );
                }

                // Treat return value as window.onerror itself does,
                // Only do our handling if not suppressed.
                if ( ret !== true ) {
                        if ( QUnit.config.current ) {
                                if ( QUnit.config.current.ignoreGlobalErrors ) {
                                        return true;
                                }
                                QUnit.pushFailure( error, filePath + ":" + linerNr );
                        } else {
                                QUnit.test( "global failure", extend( function() {
                                        QUnit.pushFailure( error, filePath + ":" + linerNr );
                                }, { validTest: true } ) );
                        }
                        return false;
                }

                return ret;
        };
}() );

// Figure out if we're running the tests from a server or not
QUnit.isLocal = !( defined.document && window.location.protocol !== "file:" );

// Expose the current QUnit version
QUnit.version = "2.0.1";

extend( QUnit, {

        // Call on start of module test to prepend name to all tests
        module: function( name, testEnvironment, executeNow ) {
                var module, moduleFns;
                var currentModule = config.currentModule;

                if ( arguments.length === 2 ) {
                        if ( objectType( testEnvironment ) === "function" ) {
                                executeNow = testEnvironment;
                                testEnvironment = undefined;
                        }
                }

                module = createModule();

                if ( testEnvironment && ( testEnvironment.setup || testEnvironment.teardown ) ) {
                        console.warn(
                                "Module's `setup` and `teardown` are not hooks anymore on QUnit 2.0, use " +
                                "`beforeEach` and `afterEach` instead\n" +
                                "Details in our upgrade guide at https://qunitjs.com/upgrade-guide-2.x/"
                        );
                }

                moduleFns = {
                        before: setHook( module, "before" ),
                        beforeEach: setHook( module, "beforeEach" ),
                        afterEach: setHook( module, "afterEach" ),
                        after: setHook( module, "after" )
                };

                if ( objectType( executeNow ) === "function" ) {
                        config.moduleStack.push( module );
                        setCurrentModule( module );
                        executeNow.call( module.testEnvironment, moduleFns );
                        config.moduleStack.pop();
                        module = module.parentModule || currentModule;
                }

                setCurrentModule( module );

                function createModule() {
                        var parentModule = config.moduleStack.length ?
                                config.moduleStack.slice( -1 )[ 0 ] : null;
                        var moduleName = parentModule !== null ?
                                [ parentModule.name, name ].join( " > " ) : name;
                        var module = {
                                name: moduleName,
                                parentModule: parentModule,
                                tests: [],
                                moduleId: generateHash( moduleName ),
                                testsRun: 0
                        };

                        var env = {};
                        if ( parentModule ) {
                                parentModule.childModule = module;
                                extend( env, parentModule.testEnvironment );
                                delete env.beforeEach;
                                delete env.afterEach;
                        }
                        extend( env, testEnvironment );
                        module.testEnvironment = env;

                        config.modules.push( module );
                        return module;
                }

                function setCurrentModule( module ) {
                        config.currentModule = module;
                }

        },

        test: test,

        skip: skip,

        only: only,

        start: function( count ) {
                var globalStartAlreadyCalled = globalStartCalled;

                if ( !config.current ) {
                        globalStartCalled = true;

                        if ( runStarted ) {
                                throw new Error( "Called start() while test already started running" );
                        } else if ( globalStartAlreadyCalled || count > 1 ) {
                                throw new Error( "Called start() outside of a test context too many times" );
                        } else if ( config.autostart ) {
                                throw new Error( "Called start() outside of a test context when " +
                                        "QUnit.config.autostart was true" );
                        } else if ( !config.pageLoaded ) {

                                // The page isn't completely loaded yet, so bail out and let `QUnit.load` handle it
                                config.autostart = true;
                                return;
                        }
                } else {
                        throw new Error(
                                "QUnit.start cannot be called inside a test context. This feature is removed in " +
                                "QUnit 2.0. For async tests, use QUnit.test() with assert.async() instead.\n" +
                                "Details in our upgrade guide at https://qunitjs.com/upgrade-guide-2.x/"
                        );
                }

                scheduleBegin();
        },

        config: config,

        is: is,

        objectType: objectType,

        extend: extend,

        load: function() {
                config.pageLoaded = true;

                // Initialize the configuration options
                extend( config, {
                        stats: { all: 0, bad: 0 },
                        moduleStats: { all: 0, bad: 0 },
                        started: 0,
                        updateRate: 1000,
                        autostart: true,
                        filter: ""
                }, true );

                if ( !runStarted ) {
                        config.blocking = false;

                        if ( config.autostart ) {
                                scheduleBegin();
                        }
                }
        },

        stack: function( offset ) {
                offset = ( offset || 0 ) + 2;
                return sourceFromStacktrace( offset );
        }
} );

registerLoggingCallbacks( QUnit );

function scheduleBegin() {

        runStarted = true;

        // Add a slight delay to allow definition of more modules and tests.
        if ( defined.setTimeout ) {
                setTimeout( function() {
                        begin();
                }, 13 );
        } else {
                begin();
        }
}

function begin() {
        var i, l,
                modulesLog = [];

        // If the test run hasn't officially begun yet
        if ( !config.started ) {

                // Record the time of the test run's beginning
                config.started = now();

                // Delete the loose unnamed module if unused.
                if ( config.modules[ 0 ].name === "" && config.modules[ 0 ].tests.length === 0 ) {
                        config.modules.shift();
                }

                // Avoid unnecessary information by not logging modules' test environments
                for ( i = 0, l = config.modules.length; i < l; i++ ) {
                        modulesLog.push( {
                                name: config.modules[ i ].name,
                                tests: config.modules[ i ].tests
                        } );
                }

                // The test run is officially beginning now
                runLoggingCallbacks( "begin", {
                        totalTests: Test.count,
                        modules: modulesLog
                } );
        }

        config.blocking = false;
        process( true );
}

function process( last ) {
        function next() {
                process( last );
        }
        var start = now();
        config.depth = ( config.depth || 0 ) + 1;

        while ( config.queue.length && !config.blocking ) {
                if ( !defined.setTimeout || config.updateRate <= 0 ||
                                ( ( now() - start ) < config.updateRate ) ) {
                        if ( config.current ) {

                                // Reset async tracking for each phase of the Test lifecycle
                                config.current.usedAsync = false;
                        }
                        config.queue.shift()();
                } else {
                        setTimeout( next, 13 );
                        break;
                }
        }
        config.depth--;
        if ( last && !config.blocking && !config.queue.length && config.depth === 0 ) {
                done();
        }
}

function done() {
        var runtime, passed;

        autorun = true;

        // Log the last module results
        if ( config.previousModule ) {
                runLoggingCallbacks( "moduleDone", {
                        name: config.previousModule.name,
                        tests: config.previousModule.tests,
                        failed: config.moduleStats.bad,
                        passed: config.moduleStats.all - config.moduleStats.bad,
                        total: config.moduleStats.all,
                        runtime: now() - config.moduleStats.started
                } );
        }
        delete config.previousModule;

        runtime = now() - config.started;
        passed = config.stats.all - config.stats.bad;

        runLoggingCallbacks( "done", {
                failed: config.stats.bad,
                passed: passed,
                total: config.stats.all,
                runtime: runtime
        } );
}

function setHook( module, hookName ) {
        if ( module.testEnvironment === undefined ) {
                module.testEnvironment = {};
        }

        return function( callback ) {
                module.testEnvironment[ hookName ] = callback;
        };
}

var unitSampler,
        focused = false,
        priorityCount = 0;

function Test( settings ) {
        var i, l;

        ++Test.count;

        this.expected = null;
        extend( this, settings );
        this.assertions = [];
        this.semaphore = 0;
        this.usedAsync = false;
        this.module = config.currentModule;
        this.stack = sourceFromStacktrace( 3 );

        // Register unique strings
        for ( i = 0, l = this.module.tests; i < l.length; i++ ) {
                if ( this.module.tests[ i ].name === this.testName ) {
                        this.testName += " ";
                }
        }

        this.testId = generateHash( this.module.name, this.testName );

        this.module.tests.push( {
                name: this.testName,
                testId: this.testId
        } );

        if ( settings.skip ) {

                // Skipped tests will fully ignore any sent callback
                this.callback = function() {};
                this.async = false;
                this.expected = 0;
        } else {
                this.assert = new Assert( this );
        }
}

Test.count = 0;

Test.prototype = {
        before: function() {
                if (

                        // Emit moduleStart when we're switching from one module to another
                        this.module !== config.previousModule ||

                                // They could be equal (both undefined) but if the previousModule property doesn't
                                // yet exist it means this is the first test in a suite that isn't wrapped in a
                                // module, in which case we'll just emit a moduleStart event for 'undefined'.
                                // Without this, reporters can get testStart before moduleStart  which is a problem.
                                !hasOwn.call( config, "previousModule" )
                ) {
                        if ( hasOwn.call( config, "previousModule" ) ) {
                                runLoggingCallbacks( "moduleDone", {
                                        name: config.previousModule.name,
                                        tests: config.previousModule.tests,
                                        failed: config.moduleStats.bad,
                                        passed: config.moduleStats.all - config.moduleStats.bad,
                                        total: config.moduleStats.all,
                                        runtime: now() - config.moduleStats.started
                                } );
                        }
                        config.previousModule = this.module;
                        config.moduleStats = { all: 0, bad: 0, started: now() };
                        runLoggingCallbacks( "moduleStart", {
                                name: this.module.name,
                                tests: this.module.tests
                        } );
                }

                config.current = this;

                if ( this.module.testEnvironment ) {
                        delete this.module.testEnvironment.before;
                        delete this.module.testEnvironment.beforeEach;
                        delete this.module.testEnvironment.afterEach;
                        delete this.module.testEnvironment.after;
                }
                this.testEnvironment = extend( {}, this.module.testEnvironment );

                this.started = now();
                runLoggingCallbacks( "testStart", {
                        name: this.testName,
                        module: this.module.name,
                        testId: this.testId
                } );

                if ( !config.pollution ) {
                        saveGlobal();
                }
        },

        run: function() {
                var promise;

                config.current = this;

                this.callbackStarted = now();

                if ( config.notrycatch ) {
                        runTest( this );
                        return;
                }

                try {
                        runTest( this );
                } catch ( e ) {
                        this.pushFailure( "Died on test #" + ( this.assertions.length + 1 ) + " " +
                                this.stack + ": " + ( e.message || e ), extractStacktrace( e, 0 ) );

                        // Else next test will carry the responsibility
                        saveGlobal();

                        // Restart the tests if they're blocking
                        if ( config.blocking ) {
                                internalRecover( this );
                        }
                }

                function runTest( test ) {
                        promise = test.callback.call( test.testEnvironment, test.assert );
                        test.resolvePromise( promise );
                }
        },

        after: function() {
                checkPollution();
        },

        queueHook: function( hook, hookName, hookOwner ) {
                var promise,
                        test = this;
                return function runHook() {
                        if ( hookName === "before" ) {
                                if ( hookOwner.testsRun !== 0 ) {
                                        return;
                                }

                                test.preserveEnvironment = true;
                        }

                        if ( hookName === "after" && hookOwner.testsRun !== numberOfTests( hookOwner ) - 1 ) {
                                return;
                        }

                        config.current = test;
                        if ( config.notrycatch ) {
                                callHook();
                                return;
                        }
                        try {
                                callHook();
                        } catch ( error ) {
                                test.pushFailure( hookName + " failed on " + test.testName + ": " +
                                ( error.message || error ), extractStacktrace( error, 0 ) );
                        }

                        function callHook() {
                                promise = hook.call( test.testEnvironment, test.assert );
                                test.resolvePromise( promise, hookName );
                        }
                };
        },

        // Currently only used for module level hooks, can be used to add global level ones
        hooks: function( handler ) {
                var hooks = [];

                function processHooks( test, module ) {
                        if ( module.parentModule ) {
                                processHooks( test, module.parentModule );
                        }
                        if ( module.testEnvironment &&
                                QUnit.objectType( module.testEnvironment[ handler ] ) === "function" ) {
                                hooks.push( test.queueHook( module.testEnvironment[ handler ], handler, module ) );
                        }
                }

                // Hooks are ignored on skipped tests
                if ( !this.skip ) {
                        processHooks( this, this.module );
                }
                return hooks;
        },

        finish: function() {
                config.current = this;
                if ( config.requireExpects && this.expected === null ) {
                        this.pushFailure( "Expected number of assertions to be defined, but expect() was " +
                                "not called.", this.stack );
                } else if ( this.expected !== null && this.expected !== this.assertions.length ) {
                        this.pushFailure( "Expected " + this.expected + " assertions, but " +
                                this.assertions.length + " were run", this.stack );
                } else if ( this.expected === null && !this.assertions.length ) {
                        this.pushFailure( "Expected at least one assertion, but none were run - call " +
                                "expect(0) to accept zero assertions.", this.stack );
                }

                var i,
                        skipped = !!this.skip,
                        bad = 0;

                this.runtime = now() - this.started;

                config.stats.all += this.assertions.length;
                config.moduleStats.all += this.assertions.length;

                for ( i = 0; i < this.assertions.length; i++ ) {
                        if ( !this.assertions[ i ].result ) {
                                bad++;
                                config.stats.bad++;
                                config.moduleStats.bad++;
                        }
                }

                notifyTestsRan( this.module );
                runLoggingCallbacks( "testDone", {
                        name: this.testName,
                        module: this.module.name,
                        skipped: skipped,
                        failed: bad,
                        passed: this.assertions.length - bad,
                        total: this.assertions.length,
                        runtime: skipped ? 0 : this.runtime,

                        // HTML Reporter use
                        assertions: this.assertions,
                        testId: this.testId,

                        // Source of Test
                        source: this.stack
                } );

                config.current = undefined;
        },

        preserveTestEnvironment: function() {
                if ( this.preserveEnvironment ) {
                        this.module.testEnvironment = this.testEnvironment;
                        this.testEnvironment = extend( {}, this.module.testEnvironment );
                }
        },

        queue: function() {
                var priority,
                        test = this;

                if ( !this.valid() ) {
                        return;
                }

                function run() {

                        // Each of these can by async
                        synchronize( [
                                function() {
                                        test.before();
                                },

                                test.hooks( "before" ),

                                function() {
                                        test.preserveTestEnvironment();
                                },

                                test.hooks( "beforeEach" ),

                                function() {
                                        test.run();
                                },

                                test.hooks( "afterEach" ).reverse(),
                                test.hooks( "after" ).reverse(),

                                function() {
                                        test.after();
                                },

                                function() {
                                        test.finish();
                                }
                        ] );
                }

                // Prioritize previously failed tests, detected from sessionStorage
                priority = QUnit.config.reorder && defined.sessionStorage &&
                                +sessionStorage.getItem( "qunit-test-" + this.module.name + "-" + this.testName );

                return synchronize( run, priority, config.seed );
        },

        pushResult: function( resultInfo ) {

                // Destructure of resultInfo = { result, actual, expected, message, negative }
                var source,
                        details = {
                                module: this.module.name,
                                name: this.testName,
                                result: resultInfo.result,
                                message: resultInfo.message,
                                actual: resultInfo.actual,
                                expected: resultInfo.expected,
                                testId: this.testId,
                                negative: resultInfo.negative || false,
                                runtime: now() - this.started
                        };

                if ( !resultInfo.result ) {
                        source = sourceFromStacktrace();

                        if ( source ) {
                                details.source = source;
                        }
                }

                runLoggingCallbacks( "log", details );

                this.assertions.push( {
                        result: !!resultInfo.result,
                        message: resultInfo.message
                } );
        },

        pushFailure: function( message, source, actual ) {
                if ( !( this instanceof Test ) ) {
                        throw new Error( "pushFailure() assertion outside test context, was " +
                                sourceFromStacktrace( 2 ) );
                }

                var details = {
                                module: this.module.name,
                                name: this.testName,
                                result: false,
                                message: message || "error",
                                actual: actual || null,
                                testId: this.testId,
                                runtime: now() - this.started
                        };

                if ( source ) {
                        details.source = source;
                }

                runLoggingCallbacks( "log", details );

                this.assertions.push( {
                        result: false,
                        message: message
                } );
        },

        resolvePromise: function( promise, phase ) {
                var then, resume, message,
                        test = this;
                if ( promise != null ) {
                        then = promise.then;
                        if ( QUnit.objectType( then ) === "function" ) {
                                resume = internalStop( test );
                                then.call(
                                        promise,
                                        function() { resume(); },
                                        function( error ) {
                                                message = "Promise rejected " +
                                                        ( !phase ? "during" : phase.replace( /Each$/, "" ) ) +
                                                        " " + test.testName + ": " + ( error.message || error );
                                                test.pushFailure( message, extractStacktrace( error, 0 ) );

                                                // Else next test will carry the responsibility
                                                saveGlobal();

                                                // Unblock
                                                resume();
                                        }
                                );
                        }
                }
        },

        valid: function() {
                var filter = config.filter,
                        regexFilter = /^(!?)\/([\w\W]*)\/(i?$)/.exec( filter ),
                        module = config.module && config.module.toLowerCase(),
                        fullName = ( this.module.name + ": " + this.testName );

                function moduleChainNameMatch( testModule ) {
                        var testModuleName = testModule.name ? testModule.name.toLowerCase() : null;
                        if ( testModuleName === module ) {
                                return true;
                        } else if ( testModule.parentModule ) {
                                return moduleChainNameMatch( testModule.parentModule );
                        } else {
                                return false;
                        }
                }

                function moduleChainIdMatch( testModule ) {
                        return inArray( testModule.moduleId, config.moduleId ) > -1 ||
                                testModule.parentModule && moduleChainIdMatch( testModule.parentModule );
                }

                // Internally-generated tests are always valid
                if ( this.callback && this.callback.validTest ) {
                        return true;
                }

                if ( config.moduleId && config.moduleId.length > 0 &&
                        !moduleChainIdMatch( this.module ) ) {

                        return false;
                }

                if ( config.testId && config.testId.length > 0 &&
                        inArray( this.testId, config.testId ) < 0 ) {

                        return false;
                }

                if ( module && !moduleChainNameMatch( this.module ) ) {
                        return false;
                }

                if ( !filter ) {
                        return true;
                }

                return regexFilter ?
                        this.regexFilter( !!regexFilter[ 1 ], regexFilter[ 2 ], regexFilter[ 3 ], fullName ) :
                        this.stringFilter( filter, fullName );
        },

        regexFilter: function( exclude, pattern, flags, fullName ) {
                var regex = new RegExp( pattern, flags );
                var match = regex.test( fullName );

                return match !== exclude;
        },

        stringFilter: function( filter, fullName ) {
                filter = filter.toLowerCase();
                fullName = fullName.toLowerCase();

                var include = filter.charAt( 0 ) !== "!";
                if ( !include ) {
                        filter = filter.slice( 1 );
                }

                // If the filter matches, we need to honour include
                if ( fullName.indexOf( filter ) !== -1 ) {
                        return include;
                }

                // Otherwise, do the opposite
                return !include;
        }
};

QUnit.pushFailure = function() {
        if ( !QUnit.config.current ) {
                throw new Error( "pushFailure() assertion outside test context, in " +
                        sourceFromStacktrace( 2 ) );
        }

        // Gets current test obj
        var currentTest = QUnit.config.current;

        return currentTest.pushFailure.apply( currentTest, arguments );
};

// Based on Java's String.hashCode, a simple but not
// rigorously collision resistant hashing function
function generateHash( module, testName ) {
        var hex,
                i = 0,
                hash = 0,
                str = module + "\x1C" + testName,
                len = str.length;

        for ( ; i < len; i++ ) {
                hash  = ( ( hash << 5 ) - hash ) + str.charCodeAt( i );
                hash |= 0;
        }

        // Convert the possibly negative integer hash code into an 8 character hex string, which isn't
        // strictly necessary but increases user understanding that the id is a SHA-like hash
        hex = ( 0x100000000 + hash ).toString( 16 );
        if ( hex.length < 8 ) {
                hex = "0000000" + hex;
        }

        return hex.slice( -8 );
}

function synchronize( callback, priority, seed ) {
        var last = !priority,
                index;

        if ( QUnit.objectType( callback ) === "array" ) {
                while ( callback.length ) {
                        synchronize( callback.shift() );
                }
                return;
        }

        if ( priority ) {
                config.queue.splice( priorityCount++, 0, callback );
        } else if ( seed ) {
                if ( !unitSampler ) {
                        unitSampler = unitSamplerGenerator( seed );
                }

                // Insert into a random position after all priority items
                index = Math.floor( unitSampler() * ( config.queue.length - priorityCount + 1 ) );
                config.queue.splice( priorityCount + index, 0, callback );
        } else {
                config.queue.push( callback );
        }

        if ( autorun && !config.blocking ) {
                process( last );
        }
}

function unitSamplerGenerator( seed ) {

        // 32-bit xorshift, requires only a nonzero seed
        // http://excamera.com/sphinx/article-xorshift.html
        var sample = parseInt( generateHash( seed ), 16 ) || -1;
        return function() {
                sample ^= sample << 13;
                sample ^= sample >>> 17;
                sample ^= sample << 5;

                // ECMAScript has no unsigned number type
                if ( sample < 0 ) {
                        sample += 0x100000000;
                }

                return sample / 0x100000000;
        };
}

function saveGlobal() {
        config.pollution = [];

        if ( config.noglobals ) {
                for ( var key in global ) {
                        if ( hasOwn.call( global, key ) ) {

                                // In Opera sometimes DOM element ids show up here, ignore them
                                if ( /^qunit-test-output/.test( key ) ) {
                                        continue;
                                }
                                config.pollution.push( key );
                        }
                }
        }
}

function checkPollution() {
        var newGlobals,
                deletedGlobals,
                old = config.pollution;

        saveGlobal();

        newGlobals = diff( config.pollution, old );
        if ( newGlobals.length > 0 ) {
                QUnit.pushFailure( "Introduced global variable(s): " + newGlobals.join( ", " ) );
        }

        deletedGlobals = diff( old, config.pollution );
        if ( deletedGlobals.length > 0 ) {
                QUnit.pushFailure( "Deleted global variable(s): " + deletedGlobals.join( ", " ) );
        }
}

// Will be exposed as QUnit.test
function test( testName, callback ) {
        if ( focused )  { return; }

        var newTest;

        newTest = new Test( {
                testName: testName,
                callback: callback
        } );

        newTest.queue();
}

// Will be exposed as QUnit.skip
function skip( testName ) {
        if ( focused )  { return; }

        var test = new Test( {
                testName: testName,
                skip: true
        } );

        test.queue();
}

// Will be exposed as QUnit.only
function only( testName, callback ) {
        var newTest;

        if ( focused )  { return; }

        QUnit.config.queue.length = 0;
        focused = true;

        newTest = new Test( {
                testName: testName,
                callback: callback
        } );

        newTest.queue();
}

// Put a hold on processing and return a function that will release it.
function internalStop( test ) {
        var released = false;

        test.semaphore += 1;
        config.blocking = true;

        // Set a recovery timeout, if so configured.
        if ( config.testTimeout && defined.setTimeout ) {
                clearTimeout( config.timeout );
                config.timeout = setTimeout( function() {
                        QUnit.pushFailure( "Test timed out", sourceFromStacktrace( 2 ) );
                        internalRecover( test );
                }, config.testTimeout );
        }

        return function resume() {
                if ( released ) {
                        return;
                }

                released = true;
                test.semaphore -= 1;
                internalStart( test );
        };
}

// Forcefully release all processing holds.
function internalRecover( test ) {
        test.semaphore = 0;
        internalStart( test );
}

// Release a processing hold, scheduling a resumption attempt if no holds remain.
function internalStart( test ) {

        // If semaphore is non-numeric, throw error
        if ( isNaN( test.semaphore ) ) {
                test.semaphore = 0;

                QUnit.pushFailure(
                        "Invalid value on test.semaphore",
                        sourceFromStacktrace( 2 )
                );
                return;
        }

        // Don't start until equal number of stop-calls
        if ( test.semaphore > 0 ) {
                return;
        }

        // Throw an Error if start is called more often than stop
        if ( test.semaphore < 0 ) {
                test.semaphore = 0;

                QUnit.pushFailure(
                        "Tried to restart test while already started (test's semaphore was 0 already)",
                        sourceFromStacktrace( 2 )
                );
                return;
        }

        // Add a slight delay to allow more assertions etc.
        if ( defined.setTimeout ) {
                if ( config.timeout ) {
                        clearTimeout( config.timeout );
                }
                config.timeout = setTimeout( function() {
                        if ( test.semaphore > 0 ) {
                                return;
                        }

                        if ( config.timeout ) {
                                clearTimeout( config.timeout );
                        }

                        begin();
                }, 13 );
        } else {
                begin();
        }
}

function numberOfTests( module ) {
        var count = module.tests.length;
        while ( module = module.childModule ) {
                count += module.tests.length;
        }
        return count;
}

function notifyTestsRan( module ) {
        module.testsRun++;
        while ( module = module.parentModule ) {
                module.testsRun++;
        }
}

function Assert( testContext ) {
        this.test = testContext;
}

// Assert helpers
QUnit.assert = Assert.prototype = {

        // Specify the number of expected assertions to guarantee that failed test
        // (no assertions are run at all) don't slip through.
        expect: function( asserts ) {
                if ( arguments.length === 1 ) {
                        this.test.expected = asserts;
                } else {
                        return this.test.expected;
                }
        },

        // Put a hold on processing and return a function that will release it a maximum of once.
        async: function( count ) {
                var resume,
                        test = this.test,
                        popped = false,
                        acceptCallCount = count;

                if ( typeof acceptCallCount === "undefined" ) {
                        acceptCallCount = 1;
                }

                test.usedAsync = true;
                resume = internalStop( test );

                return function done() {

                        if ( popped ) {
                                test.pushFailure( "Too many calls to the `assert.async` callback",
                                        sourceFromStacktrace( 2 ) );
                                return;
                        }
                        acceptCallCount -= 1;
                        if ( acceptCallCount > 0 ) {
                                return;
                        }

                        popped = true;
                        resume();
                };
        },

        // Exports test.push() to the user API
        // Alias of pushResult.
        push: function( result, actual, expected, message, negative ) {
                var currentAssert = this instanceof Assert ? this : QUnit.config.current.assert;
                return currentAssert.pushResult( {
                        result: result,
                        actual: actual,
                        expected: expected,
                        message: message,
                        negative: negative
                } );
        },

        pushResult: function( resultInfo ) {

                // Destructure of resultInfo = { result, actual, expected, message, negative }
                var assert = this,
                        currentTest = ( assert instanceof Assert && assert.test ) || QUnit.config.current;

                // Backwards compatibility fix.
                // Allows the direct use of global exported assertions and QUnit.assert.*
                // Although, it's use is not recommended as it can leak assertions
                // to other tests from async tests, because we only get a reference to the current test,
                // not exactly the test where assertion were intended to be called.
                if ( !currentTest ) {
                        throw new Error( "assertion outside test context, in " + sourceFromStacktrace( 2 ) );
                }

                if ( currentTest.usedAsync === true && currentTest.semaphore === 0 ) {
                        currentTest.pushFailure( "Assertion after the final `assert.async` was resolved",
                                sourceFromStacktrace( 2 ) );

                        // Allow this assertion to continue running anyway...
                }

                if ( !( assert instanceof Assert ) ) {
                        assert = currentTest.assert;
                }

                return assert.test.pushResult( resultInfo );
        },

        ok: function( result, message ) {
                message = message || ( result ? "okay" : "failed, expected argument to be truthy, was: " +
                        QUnit.dump.parse( result ) );
                this.pushResult( {
                        result: !!result,
                        actual: result,
                        expected: true,
                        message: message
                } );
        },

        notOk: function( result, message ) {
                message = message || ( !result ? "okay" : "failed, expected argument to be falsy, was: " +
                        QUnit.dump.parse( result ) );
                this.pushResult( {
                        result: !result,
                        actual: result,
                        expected: false,
                        message: message
                } );
        },

        equal: function( actual, expected, message ) {
                /*jshint eqeqeq:false */
                this.pushResult( {
                        result: expected == actual,
                        actual: actual,
                        expected: expected,
                        message: message
                } );
        },

        notEqual: function( actual, expected, message ) {
                /*jshint eqeqeq:false */
                this.pushResult( {
                        result: expected != actual,
                        actual: actual,
                        expected: expected,
                        message: message,
                        negative: true
                } );
        },

        propEqual: function( actual, expected, message ) {
                actual = objectValues( actual );
                expected = objectValues( expected );
                this.pushResult( {
                        result: QUnit.equiv( actual, expected ),
                        actual: actual,
                        expected: expected,
                        message: message
                } );
        },

        notPropEqual: function( actual, expected, message ) {
                actual = objectValues( actual );
                expected = objectValues( expected );
                this.pushResult( {
                        result: !QUnit.equiv( actual, expected ),
                        actual: actual,
                        expected: expected,
                        message: message,
                        negative: true
                } );
        },

        deepEqual: function( actual, expected, message ) {
                this.pushResult( {
                        result: QUnit.equiv( actual, expected ),
                        actual: actual,
                        expected: expected,
                        message: message
                } );
        },

        notDeepEqual: function( actual, expected, message ) {
                this.pushResult( {
                        result: !QUnit.equiv( actual, expected ),
                        actual: actual,
                        expected: expected,
                        message: message,
                        negative: true
                } );
        },

        strictEqual: function( actual, expected, message ) {
                this.pushResult( {
                        result: expected === actual,
                        actual: actual,
                        expected: expected,
                        message: message
                } );
        },

        notStrictEqual: function( actual, expected, message ) {
                this.pushResult( {
                        result: expected !== actual,
                        actual: actual,
                        expected: expected,
                        message: message,
                        negative: true
                } );
        },

        "throws": function( block, expected, message ) {
                var actual, expectedType,
                        expectedOutput = expected,
                        ok = false,
                        currentTest = ( this instanceof Assert && this.test ) || QUnit.config.current;

                // 'expected' is optional unless doing string comparison
                if ( QUnit.objectType( expected ) === "string" ) {
                        if ( message == null ) {
                                message = expected;
                                expected = null;
                        } else {
                                throw new Error(
                                        "throws/raises does not accept a string value for the expected argument.\n" +
                                        "Use a non-string object value (e.g. regExp) instead if it's necessary." +
                                        "Details in our upgrade guide at https://qunitjs.com/upgrade-guide-2.x/"
                                );
                        }
                }

                currentTest.ignoreGlobalErrors = true;
                try {
                        block.call( currentTest.testEnvironment );
                } catch ( e ) {
                        actual = e;
                }
                currentTest.ignoreGlobalErrors = false;

                if ( actual ) {
                        expectedType = QUnit.objectType( expected );

                        // We don't want to validate thrown error
                        if ( !expected ) {
                                ok = true;
                                expectedOutput = null;

                        // Expected is a regexp
                        } else if ( expectedType === "regexp" ) {
                                ok = expected.test( errorString( actual ) );

                        // Expected is a constructor, maybe an Error constructor
                        } else if ( expectedType === "function" && actual instanceof expected ) {
                                ok = true;

                        // Expected is an Error object
                        } else if ( expectedType === "object" ) {
                                ok = actual instanceof expected.constructor &&
                                        actual.name === expected.name &&
                                        actual.message === expected.message;

                        // Expected is a validation function which returns true if validation passed
                        } else if ( expectedType === "function" && expected.call( {}, actual ) === true ) {
                                expectedOutput = null;
                                ok = true;
                        }
                }

                currentTest.assert.pushResult( {
                        result: ok,
                        actual: actual,
                        expected: expectedOutput,
                        message: message
                } );
        }
};

// Provide an alternative to assert.throws(), for environments that consider throws a reserved word
// Known to us are: Closure Compiler, Narwhal
( function() {
        /*jshint sub:true */
        Assert.prototype.raises = Assert.prototype [ "throws" ]; //jscs:ignore requireDotNotation
}() );

function errorString( error ) {
        var name, message,
                resultErrorString = error.toString();
        if ( resultErrorString.substring( 0, 7 ) === "[object" ) {
                name = error.name ? error.name.toString() : "Error";
                message = error.message ? error.message.toString() : "";
                if ( name && message ) {
                        return name + ": " + message;
                } else if ( name ) {
                        return name;
                } else if ( message ) {
                        return message;
                } else {
                        return "Error";
                }
        } else {
                return resultErrorString;
        }
}

// Test for equality any JavaScript type.
// Author: Philippe Rathé <prathe@gmail.com>
QUnit.equiv = ( function() {

        // Stack to decide between skip/abort functions
        var callers = [];

        // Stack to avoiding loops from circular referencing
        var parents = [];
        var parentsB = [];

        var getProto = Object.getPrototypeOf || function( obj ) {

                /*jshint proto: true */
                return obj.__proto__;
        };

        function useStrictEquality( b, a ) {

                // To catch short annotation VS 'new' annotation of a declaration. e.g.:
                // `var i = 1;`
                // `var j = new Number(1);`
                if ( typeof a === "object" ) {
                        a = a.valueOf();
                }
                if ( typeof b === "object" ) {
                        b = b.valueOf();
                }

                return a === b;
        }

        function compareConstructors( a, b ) {
                var protoA = getProto( a );
                var protoB = getProto( b );

                // Comparing constructors is more strict than using `instanceof`
                if ( a.constructor === b.constructor ) {
                        return true;
                }

                // Ref #851
                // If the obj prototype descends from a null constructor, treat it
                // as a null prototype.
                if ( protoA && protoA.constructor === null ) {
                        protoA = null;
                }
                if ( protoB && protoB.constructor === null ) {
                        protoB = null;
                }

                // Allow objects with no prototype to be equivalent to
                // objects with Object as their constructor.
                if ( ( protoA === null && protoB === Object.prototype ) ||
                                ( protoB === null && protoA === Object.prototype ) ) {
                        return true;
                }

                return false;
        }

        function getRegExpFlags( regexp ) {
                return "flags" in regexp ? regexp.flags : regexp.toString().match( /[gimuy]*$/ )[ 0 ];
        }

        var callbacks = {
                "string": useStrictEquality,
                "boolean": useStrictEquality,
                "number": useStrictEquality,
                "null": useStrictEquality,
                "undefined": useStrictEquality,
                "symbol": useStrictEquality,
                "date": useStrictEquality,

                "nan": function() {
                        return true;
                },

                "regexp": function( b, a ) {
                        return a.source === b.source &&

                                // Include flags in the comparison
                                getRegExpFlags( a ) === getRegExpFlags( b );
                },

                // - skip when the property is a method of an instance (OOP)
                // - abort otherwise,
                // initial === would have catch identical references anyway
                "function": function() {
                        var caller = callers[ callers.length - 1 ];
                        return caller !== Object && typeof caller !== "undefined";
                },

                "array": function( b, a ) {
                        var i, j, len, loop, aCircular, bCircular;

                        len = a.length;
                        if ( len !== b.length ) {

                                // Safe and faster
                                return false;
                        }

                        // Track reference to avoid circular references
                        parents.push( a );
                        parentsB.push( b );
                        for ( i = 0; i < len; i++ ) {
                                loop = false;
                                for ( j = 0; j < parents.length; j++ ) {
                                        aCircular = parents[ j ] === a[ i ];
                                        bCircular = parentsB[ j ] === b[ i ];
                                        if ( aCircular || bCircular ) {
                                                if ( a[ i ] === b[ i ] || aCircular && bCircular ) {
                                                        loop = true;
                                                } else {
                                                        parents.pop();
                                                        parentsB.pop();
                                                        return false;
                                                }
                                        }
                                }
                                if ( !loop && !innerEquiv( a[ i ], b[ i ] ) ) {
                                        parents.pop();
                                        parentsB.pop();
                                        return false;
                                }
                        }
                        parents.pop();
                        parentsB.pop();
                        return true;
                },

                "set": function( b, a ) {
                        var innerEq,
                                outerEq = true;

                        if ( a.size !== b.size ) {
                                return false;
                        }

                        a.forEach( function( aVal ) {
                                innerEq = false;

                                b.forEach( function( bVal ) {
                                        if ( innerEquiv( bVal, aVal ) ) {
                                                innerEq = true;
                                        }
                                } );

                                if ( !innerEq ) {
                                        outerEq = false;
                                }
                        } );

                        return outerEq;
                },

                "map": function( b, a ) {
                        var innerEq,
                                outerEq = true;

                        if ( a.size !== b.size ) {
                                return false;
                        }

                        a.forEach( function( aVal, aKey ) {
                                innerEq = false;

                                b.forEach( function( bVal, bKey ) {
                                        if ( innerEquiv( [ bVal, bKey ], [ aVal, aKey ] ) ) {
                                                innerEq = true;
                                        }
                                } );

                                if ( !innerEq ) {
                                        outerEq = false;
                                }
                        } );

                        return outerEq;
                },

                "object": function( b, a ) {
                        var i, j, loop, aCircular, bCircular;

                        // Default to true
                        var eq = true;
                        var aProperties = [];
                        var bProperties = [];

                        if ( compareConstructors( a, b ) === false ) {
                                return false;
                        }

                        // Stack constructor before traversing properties
                        callers.push( a.constructor );

                        // Track reference to avoid circular references
                        parents.push( a );
                        parentsB.push( b );

                        // Be strict: don't ensure hasOwnProperty and go deep
                        for ( i in a ) {
                                loop = false;
                                for ( j = 0; j < parents.length; j++ ) {
                                        aCircular = parents[ j ] === a[ i ];
                                        bCircular = parentsB[ j ] === b[ i ];
                                        if ( aCircular || bCircular ) {
                                                if ( a[ i ] === b[ i ] || aCircular && bCircular ) {
                                                        loop = true;
                                                } else {
                                                        eq = false;
                                                        break;
                                                }
                                        }
                                }
                                aProperties.push( i );
                                if ( !loop && !innerEquiv( a[ i ], b[ i ] ) ) {
                                        eq = false;
                                        break;
                                }
                        }

                        parents.pop();
                        parentsB.pop();

                        // Unstack, we are done
                        callers.pop();

                        for ( i in b ) {

                                // Collect b's properties
                                bProperties.push( i );
                        }

                        // Ensures identical properties name
                        return eq && innerEquiv( aProperties.sort(), bProperties.sort() );
                }
        };

        function typeEquiv( a, b ) {
                var type = QUnit.objectType( a );
                return QUnit.objectType( b ) === type && callbacks[ type ]( b, a );
        }

        // The real equiv function
        function innerEquiv( a, b ) {

                // We're done when there's nothing more to compare
                if ( arguments.length < 2 ) {
                        return true;
                }

                // Require type-specific equality
                return ( a === b || typeEquiv( a, b ) ) &&

                        // ...across all consecutive argument pairs
                        ( arguments.length === 2 || innerEquiv.apply( this, [].slice.call( arguments, 1 ) ) );
        }

        return innerEquiv;
}() );

// Based on jsDump by Ariel Flesler
// http://flesler.blogspot.com/2008/05/jsdump-pretty-dump-of-any-javascript.html
QUnit.dump = ( function() {
        function quote( str ) {
                return "\"" + str.toString().replace( /\\/g, "\\\\" ).replace( /"/g, "\\\"" ) + "\"";
        }
        function literal( o ) {
                return o + "";
        }
        function join( pre, arr, post ) {
                var s = dump.separator(),
                        base = dump.indent(),
                        inner = dump.indent( 1 );
                if ( arr.join ) {
                        arr = arr.join( "," + s + inner );
                }
                if ( !arr ) {
                        return pre + post;
                }
                return [ pre, inner + arr, base + post ].join( s );
        }
        function array( arr, stack ) {
                var i = arr.length,
                        ret = new Array( i );

                if ( dump.maxDepth && dump.depth > dump.maxDepth ) {
                        return "[object Array]";
                }

                this.up();
                while ( i-- ) {
                        ret[ i ] = this.parse( arr[ i ], undefined, stack );
                }
                this.down();
                return join( "[", ret, "]" );
        }

        function isArray( obj ) {
                return (

                        //Native Arrays
                        toString.call( obj ) === "[object Array]" ||

                        // NodeList objects
                        ( typeof obj.length === "number" && obj.item !== undefined ) &&
                        ( obj.length ?
                                obj.item( 0 ) === obj[ 0 ] :
                                ( obj.item( 0 ) === null && obj[ 0 ] === undefined )
                        )
                );
        }

        var reName = /^function (\w+)/,
                dump = {

                        // The objType is used mostly internally, you can fix a (custom) type in advance
                        parse: function( obj, objType, stack ) {
                                stack = stack || [];
                                var res, parser, parserType,
                                        inStack = inArray( obj, stack );

                                if ( inStack !== -1 ) {
                                        return "recursion(" + ( inStack - stack.length ) + ")";
                                }

                                objType = objType || this.typeOf( obj  );
                                parser = this.parsers[ objType ];
                                parserType = typeof parser;

                                if ( parserType === "function" ) {
                                        stack.push( obj );
                                        res = parser.call( this, obj, stack );
                                        stack.pop();
                                        return res;
                                }
                                return ( parserType === "string" ) ? parser : this.parsers.error;
                        },
                        typeOf: function( obj ) {
                                var type;

                                if ( obj === null ) {
                                        type = "null";
                                } else if ( typeof obj === "undefined" ) {
                                        type = "undefined";
                                } else if ( QUnit.is( "regexp", obj ) ) {
                                        type = "regexp";
                                } else if ( QUnit.is( "date", obj ) ) {
                                        type = "date";
                                } else if ( QUnit.is( "function", obj ) ) {
                                        type = "function";
                                } else if ( obj.setInterval !== undefined &&
                                                obj.document !== undefined &&
                                                obj.nodeType === undefined ) {
                                        type = "window";
                                } else if ( obj.nodeType === 9 ) {
                                        type = "document";
                                } else if ( obj.nodeType ) {
                                        type = "node";
                                } else if ( isArray( obj ) ) {
                                        type = "array";
                                } else if ( obj.constructor === Error.prototype.constructor ) {
                                        type = "error";
                                } else {
                                        type = typeof obj;
                                }
                                return type;
                        },

                        separator: function() {
                                return this.multiline ? this.HTML ? "<br />" : "\n" : this.HTML ? "&#160;" : " ";
                        },

                        // Extra can be a number, shortcut for increasing-calling-decreasing
                        indent: function( extra ) {
                                if ( !this.multiline ) {
                                        return "";
                                }
                                var chr = this.indentChar;
                                if ( this.HTML ) {
                                        chr = chr.replace( /\t/g, "   " ).replace( / /g, "&#160;" );
                                }
                                return new Array( this.depth + ( extra || 0 ) ).join( chr );
                        },
                        up: function( a ) {
                                this.depth += a || 1;
                        },
                        down: function( a ) {
                                this.depth -= a || 1;
                        },
                        setParser: function( name, parser ) {
                                this.parsers[ name ] = parser;
                        },

                        // The next 3 are exposed so you can use them
                        quote: quote,
                        literal: literal,
                        join: join,
                        depth: 1,
                        maxDepth: QUnit.config.maxDepth,

                        // This is the list of parsers, to modify them, use dump.setParser
                        parsers: {
                                window: "[Window]",
                                document: "[Document]",
                                error: function( error ) {
                                        return "Error(\"" + error.message + "\")";
                                },
                                unknown: "[Unknown]",
                                "null": "null",
                                "undefined": "undefined",
                                "function": function( fn ) {
                                        var ret = "function",

                                                // Functions never have name in IE
                                                name = "name" in fn ? fn.name : ( reName.exec( fn ) || [] )[ 1 ];

                                        if ( name ) {
                                                ret += " " + name;
                                        }
                                        ret += "(";

                                        ret = [ ret, dump.parse( fn, "functionArgs" ), "){" ].join( "" );
                                        return join( ret, dump.parse( fn, "functionCode" ), "}" );
                                },
                                array: array,
                                nodelist: array,
                                "arguments": array,
                                object: function( map, stack ) {
                                        var keys, key, val, i, nonEnumerableProperties,
                                                ret = [];

                                        if ( dump.maxDepth && dump.depth > dump.maxDepth ) {
                                                return "[object Object]";
                                        }

                                        dump.up();
                                        keys = [];
                                        for ( key in map ) {
                                                keys.push( key );
                                        }

                                        // Some properties are not always enumerable on Error objects.
                                        nonEnumerableProperties = [ "message", "name" ];
                                        for ( i in nonEnumerableProperties ) {
                                                key = nonEnumerableProperties[ i ];
                                                if ( key in map && inArray( key, keys ) < 0 ) {
                                                        keys.push( key );
                                                }
                                        }
                                        keys.sort();
                                        for ( i = 0; i < keys.length; i++ ) {
                                                key = keys[ i ];
                                                val = map[ key ];
                                                ret.push( dump.parse( key, "key" ) + ": " +
                                                        dump.parse( val, undefined, stack ) );
                                        }
                                        dump.down();
                                        return join( "{", ret, "}" );
                                },
                                node: function( node ) {
                                        var len, i, val,
                                                open = dump.HTML ? "&lt;" : "<",
                                                close = dump.HTML ? "&gt;" : ">",
                                                tag = node.nodeName.toLowerCase(),
                                                ret = open + tag,
                                                attrs = node.attributes;

                                        if ( attrs ) {
                                                for ( i = 0, len = attrs.length; i < len; i++ ) {
                                                        val = attrs[ i ].nodeValue;

                                                        // IE6 includes all attributes in .attributes, even ones not explicitly
                                                        // set. Those have values like undefined, null, 0, false, "" or
                                                        // "inherit".
                                                        if ( val && val !== "inherit" ) {
                                                                ret += " " + attrs[ i ].nodeName + "=" +
                                                                        dump.parse( val, "attribute" );
                                                        }
                                                }
                                        }
                                        ret += close;

                                        // Show content of TextNode or CDATASection
                                        if ( node.nodeType === 3 || node.nodeType === 4 ) {
                                                ret += node.nodeValue;
                                        }

                                        return ret + open + "/" + tag + close;
                                },

                                // Function calls it internally, it's the arguments part of the function
                                functionArgs: function( fn ) {
                                        var args,
                                                l = fn.length;

                                        if ( !l ) {
                                                return "";
                                        }

                                        args = new Array( l );
                                        while ( l-- ) {

                                                // 97 is 'a'
                                                args[ l ] = String.fromCharCode( 97 + l );
                                        }
                                        return " " + args.join( ", " ) + " ";
                                },

                                // Object calls it internally, the key part of an item in a map
                                key: quote,

                                // Function calls it internally, it's the content of the function
                                functionCode: "[code]",

                                // Node calls it internally, it's a html attribute value
                                attribute: quote,
                                string: quote,
                                date: quote,
                                regexp: literal,
                                number: literal,
                                "boolean": literal,
                                symbol: function( sym ) {
                                        return sym.toString();
                                }
                        },

                        // If true, entities are escaped ( <, >, \t, space and \n )
                        HTML: false,

                        // Indentation unit
                        indentChar: "  ",

                        // If true, items in a collection, are separated by a \n, else just a space.
                        multiline: true
                };

        return dump;
}() );

// Back compat
QUnit.jsDump = QUnit.dump;

function applyDeprecated( name ) {
        return function() {
                throw new Error(
                        name + " is removed in QUnit 2.0.\n" +
                        "Details in our upgrade guide at https://qunitjs.com/upgrade-guide-2.x/"
                );
        };
}

Object.keys( Assert.prototype ).forEach( function( key ) {
        QUnit[ key ] = applyDeprecated( "`QUnit." + key + "`" );
} );

QUnit.asyncTest = function() {
        throw new Error(
                "asyncTest is removed in QUnit 2.0, use QUnit.test() with assert.async() instead.\n" +
                "Details in our upgrade guide at https://qunitjs.com/upgrade-guide-2.x/"
        );
};

QUnit.stop = function() {
        throw new Error(
                "QUnit.stop is removed in QUnit 2.0, use QUnit.test() with assert.async() instead.\n" +
                "Details in our upgrade guide at https://qunitjs.com/upgrade-guide-2.x/"
        );
};

function resetThrower() {
        throw new Error(
                "QUnit.reset is removed in QUnit 2.0 without replacement.\n" +
                "Details in our upgrade guide at https://qunitjs.com/upgrade-guide-2.x/"
        );
}

Object.defineProperty( QUnit, "reset", {
        get: function() {
                return resetThrower;
        },
        set: resetThrower
} );

if ( defined.document ) {
        if ( window.QUnit ) {
                throw new Error( "QUnit has already been defined." );
        }

        [
                "test",
                "module",
                "expect",
                "start",
                "ok",
                "notOk",
                "equal",
                "notEqual",
                "propEqual",
                "notPropEqual",
                "deepEqual",
                "notDeepEqual",
                "strictEqual",
                "notStrictEqual",
                "throws",
                "raises"
        ].forEach( function( key ) {
                window[ key ] = applyDeprecated( "The global `" + key + "`" );
        } );

        window.QUnit = QUnit;
}

// For nodejs
if ( typeof module !== "undefined" && module && module.exports ) {
        module.exports = QUnit;

        // For consistency with CommonJS environments' exports
        module.exports.QUnit = QUnit;
}

// For CommonJS with exports, but without module.exports, like Rhino
if ( typeof exports !== "undefined" && exports ) {
        exports.QUnit = QUnit;
}

if ( typeof define === "function" && define.amd ) {
        define( function() {
                return QUnit;
        } );
        QUnit.config.autostart = false;
}

// Get a reference to the global object, like window in browsers
}( ( function() {
        return this;
}() ) ) );

( function() {

if ( typeof window === "undefined" || !window.document ) {
        return;
}

var config = QUnit.config,
        hasOwn = Object.prototype.hasOwnProperty;

// Stores fixture HTML for resetting later
function storeFixture() {

        // Avoid overwriting user-defined values
        if ( hasOwn.call( config, "fixture" ) ) {
                return;
        }

        var fixture = document.getElementById( "qunit-fixture" );
        if ( fixture ) {
                config.fixture = fixture.innerHTML;
        }
}

QUnit.begin( storeFixture );

// Resets the fixture DOM element if available.
function resetFixture() {
        if ( config.fixture == null ) {
                return;
        }

        var fixture = document.getElementById( "qunit-fixture" );
        if ( fixture ) {
                fixture.innerHTML = config.fixture;
        }
}

QUnit.testStart( resetFixture );

}() );

( function() {

// Only interact with URLs via window.location
var location = typeof window !== "undefined" && window.location;
if ( !location ) {
        return;
}

var urlParams = getUrlParams();

QUnit.urlParams = urlParams;

// Match module/test by inclusion in an array
QUnit.config.moduleId = [].concat( urlParams.moduleId || [] );
QUnit.config.testId = [].concat( urlParams.testId || [] );

// Exact case-insensitive match of the module name
QUnit.config.module = urlParams.module;

// Regular expression or case-insenstive substring match against "moduleName: testName"
QUnit.config.filter = urlParams.filter;

// Test order randomization
if ( urlParams.seed === true ) {

        // Generate a random seed if the option is specified without a value
        QUnit.config.seed = Math.random().toString( 36 ).slice( 2 );
} else if ( urlParams.seed ) {
        QUnit.config.seed = urlParams.seed;
}

// Add URL-parameter-mapped config values with UI form rendering data
QUnit.config.urlConfig.push(
        {
                id: "hidepassed",
                label: "Hide passed tests",
                tooltip: "Only show tests and assertions that fail. Stored as query-strings."
        },
        {
                id: "noglobals",
                label: "Check for Globals",
                tooltip: "Enabling this will test if any test introduces new properties on the " +
                        "global object (`window` in Browsers). Stored as query-strings."
        },
        {
                id: "notrycatch",
                label: "No try-catch",
                tooltip: "Enabling this will run tests outside of a try-catch block. Makes debugging " +
                        "exceptions in IE reasonable. Stored as query-strings."
        }
);

QUnit.begin( function() {
        var i, option,
                urlConfig = QUnit.config.urlConfig;

        for ( i = 0; i < urlConfig.length; i++ ) {

                // Options can be either strings or objects with nonempty "id" properties
                option = QUnit.config.urlConfig[ i ];
                if ( typeof option !== "string" ) {
                        option = option.id;
                }

                if ( QUnit.config[ option ] === undefined ) {
                        QUnit.config[ option ] = urlParams[ option ];
                }
        }
} );

function getUrlParams() {
        var i, param, name, value;
        var urlParams = {};
        var params = location.search.slice( 1 ).split( "&" );
        var length = params.length;

        for ( i = 0; i < length; i++ ) {
                if ( params[ i ] ) {
                        param = params[ i ].split( "=" );
                        name = decodeQueryParam( param[ 0 ] );

                        // Allow just a key to turn on a flag, e.g., test.html?noglobals
                        value = param.length === 1 ||
                                decodeQueryParam( param.slice( 1 ).join( "=" ) ) ;
                        if ( urlParams[ name ] ) {
                                urlParams[ name ] = [].concat( urlParams[ name ], value );
                        } else {
                                urlParams[ name ] = value;
                        }
                }
        }

        return urlParams;
}

function decodeQueryParam( param ) {
        return decodeURIComponent( param.replace( /\+/g, "%20" ) );
}

// Don't load the HTML Reporter on non-browser environments
if ( typeof window === "undefined" || !window.document ) {
        return;
}

QUnit.init = function() {
        throw new Error(
                "QUnit.init is removed in QUnit 2.0, use QUnit.test() with assert.async() instead.\n" +
                "Details in our upgrade guide at https://qunitjs.com/upgrade-guide-2.x/"
        );
};

var config = QUnit.config,
        document = window.document,
        collapseNext = false,
        hasOwn = Object.prototype.hasOwnProperty,
        unfilteredUrl = setUrl( { filter: undefined, module: undefined,
                moduleId: undefined, testId: undefined } ),
        defined = {
                sessionStorage: ( function() {
                        var x = "qunit-test-string";
                        try {
                                sessionStorage.setItem( x, x );
                                sessionStorage.removeItem( x );
                                return true;
                        } catch ( e ) {
                                return false;
                        }
                }() )
        },
        modulesList = [];

// Escape text for attribute or text content.
function escapeText( s ) {
        if ( !s ) {
                return "";
        }
        s = s + "";

        // Both single quotes and double quotes (for attributes)
        return s.replace( /['"<>&]/g, function( s ) {
                switch ( s ) {
                case "'":
                        return "&#039;";
                case "\"":
                        return "&quot;";
                case "<":
                        return "&lt;";
                case ">":
                        return "&gt;";
                case "&":
                        return "&amp;";
                }
        } );
}

function addEvent( elem, type, fn ) {
        elem.addEventListener( type, fn, false );
}

function removeEvent( elem, type, fn ) {
        elem.removeEventListener( type, fn, false );
}

function addEvents( elems, type, fn ) {
        var i = elems.length;
        while ( i-- ) {
                addEvent( elems[ i ], type, fn );
        }
}

function hasClass( elem, name ) {
        return ( " " + elem.className + " " ).indexOf( " " + name + " " ) >= 0;
}

function addClass( elem, name ) {
        if ( !hasClass( elem, name ) ) {
                elem.className += ( elem.className ? " " : "" ) + name;
        }
}

function toggleClass( elem, name, force ) {
        if ( force || typeof force === "undefined" && !hasClass( elem, name ) ) {
                addClass( elem, name );
        } else {
                removeClass( elem, name );
        }
}

function removeClass( elem, name ) {
        var set = " " + elem.className + " ";

        // Class name may appear multiple times
        while ( set.indexOf( " " + name + " " ) >= 0 ) {
                set = set.replace( " " + name + " ", " " );
        }

        // Trim for prettiness
        elem.className = typeof set.trim === "function" ? set.trim() : set.replace( /^\s+|\s+$/g, "" );
}

function id( name ) {
        return document.getElementById && document.getElementById( name );
}

function interceptNavigation( ev ) {
        applyUrlParams();

        if ( ev && ev.preventDefault ) {
                ev.preventDefault();
        }

        return false;
}

function getUrlConfigHtml() {
        var i, j, val,
                escaped, escapedTooltip,
                selection = false,
                urlConfig = config.urlConfig,
                urlConfigHtml = "";

        for ( i = 0; i < urlConfig.length; i++ ) {

                // Options can be either strings or objects with nonempty "id" properties
                val = config.urlConfig[ i ];
                if ( typeof val === "string" ) {
                        val = {
                                id: val,
                                label: val
                        };
                }

                escaped = escapeText( val.id );
                escapedTooltip = escapeText( val.tooltip );

                if ( !val.value || typeof val.value === "string" ) {
                        urlConfigHtml += "<label for='qunit-urlconfig-" + escaped +
                                "' title='" + escapedTooltip + "'><input id='qunit-urlconfig-" + escaped +
                                "' name='" + escaped + "' type='checkbox'" +
                                ( val.value ? " value='" + escapeText( val.value ) + "'" : "" ) +
                                ( config[ val.id ] ? " checked='checked'" : "" ) +
                                " title='" + escapedTooltip + "' />" + escapeText( val.label ) + "</label>";
                } else {
                        urlConfigHtml += "<label for='qunit-urlconfig-" + escaped +
                                "' title='" + escapedTooltip + "'>" + val.label +
                                ": </label><select id='qunit-urlconfig-" + escaped +
                                "' name='" + escaped + "' title='" + escapedTooltip + "'><option></option>";

                        if ( QUnit.is( "array", val.value ) ) {
                                for ( j = 0; j < val.value.length; j++ ) {
                                        escaped = escapeText( val.value[ j ] );
                                        urlConfigHtml += "<option value='" + escaped + "'" +
                                                ( config[ val.id ] === val.value[ j ] ?
                                                        ( selection = true ) && " selected='selected'" : "" ) +
                                                ">" + escaped + "</option>";
                                }
                        } else {
                                for ( j in val.value ) {
                                        if ( hasOwn.call( val.value, j ) ) {
                                                urlConfigHtml += "<option value='" + escapeText( j ) + "'" +
                                                        ( config[ val.id ] === j ?
                                                                ( selection = true ) && " selected='selected'" : "" ) +
                                                        ">" + escapeText( val.value[ j ] ) + "</option>";
                                        }
                                }
                        }
                        if ( config[ val.id ] && !selection ) {
                                escaped = escapeText( config[ val.id ] );
                                urlConfigHtml += "<option value='" + escaped +
                                        "' selected='selected' disabled='disabled'>" + escaped + "</option>";
                        }
                        urlConfigHtml += "</select>";
                }
        }

        return urlConfigHtml;
}

// Handle "click" events on toolbar checkboxes and "change" for select menus.
// Updates the URL with the new state of `config.urlConfig` values.
function toolbarChanged() {
        var updatedUrl, value, tests,
                field = this,
                params = {};

        // Detect if field is a select menu or a checkbox
        if ( "selectedIndex" in field ) {
                value = field.options[ field.selectedIndex ].value || undefined;
        } else {
                value = field.checked ? ( field.defaultValue || true ) : undefined;
        }

        params[ field.name ] = value;
        updatedUrl = setUrl( params );

        // Check if we can apply the change without a page refresh
        if ( "hidepassed" === field.name && "replaceState" in window.history ) {
                QUnit.urlParams[ field.name ] = value;
                config[ field.name ] = value || false;
                tests = id( "qunit-tests" );
                if ( tests ) {
                        toggleClass( tests, "hidepass", value || false );
                }
                window.history.replaceState( null, "", updatedUrl );
        } else {
                window.location = updatedUrl;
        }
}

function setUrl( params ) {
        var key, arrValue, i,
                querystring = "?",
                location = window.location;

        params = QUnit.extend( QUnit.extend( {}, QUnit.urlParams ), params );

        for ( key in params ) {

                // Skip inherited or undefined properties
                if ( hasOwn.call( params, key ) && params[ key ] !== undefined ) {

                        // Output a parameter for each value of this key (but usually just one)
                        arrValue = [].concat( params[ key ] );
                        for ( i = 0; i < arrValue.length; i++ ) {
                                querystring += encodeURIComponent( key );
                                if ( arrValue[ i ] !== true ) {
                                        querystring += "=" + encodeURIComponent( arrValue[ i ] );
                                }
                                querystring += "&";
                        }
                }
        }
        return location.protocol + "//" + location.host +
                location.pathname + querystring.slice( 0, -1 );
}

function applyUrlParams() {
        var i,
                selectedModules = [],
                modulesList = id( "qunit-modulefilter-dropdown-list" ).getElementsByTagName( "input" ),
                filter = id( "qunit-filter-input" ).value;

        for ( i = 0; i < modulesList.length; i++ )  {
                if ( modulesList[ i ].checked ) {
                        selectedModules.push( modulesList[ i ].value );
                }
        }

        window.location = setUrl( {
                filter: ( filter === "" ) ? undefined : filter,
                moduleId: ( selectedModules.length === 0 ) ? undefined : selectedModules,

                // Remove module and testId filter
                module: undefined,
                testId: undefined
        } );
}

function toolbarUrlConfigContainer() {
        var urlConfigContainer = document.createElement( "span" );

        urlConfigContainer.innerHTML = getUrlConfigHtml();
        addClass( urlConfigContainer, "qunit-url-config" );

        addEvents( urlConfigContainer.getElementsByTagName( "input" ), "change", toolbarChanged );
        addEvents( urlConfigContainer.getElementsByTagName( "select" ), "change", toolbarChanged );

        return urlConfigContainer;
}

function toolbarLooseFilter() {
        var filter = document.createElement( "form" ),
                label = document.createElement( "label" ),
                input = document.createElement( "input" ),
                button = document.createElement( "button" );

        addClass( filter, "qunit-filter" );

        label.innerHTML = "Filter: ";

        input.type = "text";
        input.value = config.filter || "";
        input.name = "filter";
        input.id = "qunit-filter-input";

        button.innerHTML = "Go";

        label.appendChild( input );

        filter.appendChild( label );
        filter.appendChild( document.createTextNode( " " ) );
        filter.appendChild( button );
        addEvent( filter, "submit", interceptNavigation );

        return filter;
}

function moduleListHtml () {
        var i, checked,
                html = "";

        for ( i = 0; i < config.modules.length; i++ ) {
                if ( config.modules[ i ].name !== "" ) {
                        checked = config.moduleId.indexOf( config.modules[ i ].moduleId ) > -1;
                        html += "<li><label class='clickable" + ( checked ? " checked" : "" ) +
                                "'><input type='checkbox' " + "value='" + config.modules[ i ].moduleId + "'" +
                                ( checked ? " checked='checked'" : "" ) + " />" +
                                escapeText( config.modules[ i ].name ) + "</label></li>";
                }
        }

        return html;
}

function toolbarModuleFilter () {
        var allCheckbox, commit, reset,
                moduleFilter = document.createElement( "form" ),
                label = document.createElement( "label" ),
                moduleSearch = document.createElement( "input" ),
                dropDown = document.createElement( "div" ),
                actions = document.createElement( "span" ),
                dropDownList = document.createElement( "ul" ),
                dirty = false;

        moduleSearch.id = "qunit-modulefilter-search";
        addEvent( moduleSearch, "input", searchInput );
        addEvent( moduleSearch, "input", searchFocus );
        addEvent( moduleSearch, "focus", searchFocus );
        addEvent( moduleSearch, "click", searchFocus );

        label.id = "qunit-modulefilter-search-container";
        label.innerHTML = "Module: ";
        label.appendChild( moduleSearch );

        actions.id = "qunit-modulefilter-actions";
        actions.innerHTML =
                "<button style='display:none'>Apply</button>" +
                "<button type='reset' style='display:none'>Reset</button>" +
                "<label class='clickable" +
                ( config.moduleId.length ? "" : " checked" ) +
                "'><input type='checkbox'" + ( config.moduleId.length ? "" : " checked='checked'" ) +
                ">All modules</label>";
        allCheckbox = actions.lastChild.firstChild;
        commit = actions.firstChild;
        reset = commit.nextSibling;
        addEvent( commit, "click", applyUrlParams );

        dropDownList.id = "qunit-modulefilter-dropdown-list";
        dropDownList.innerHTML = moduleListHtml();

        dropDown.id = "qunit-modulefilter-dropdown";
        dropDown.style.display = "none";
        dropDown.appendChild( actions );
        dropDown.appendChild( dropDownList );
        addEvent( dropDown, "change", selectionChange );
        selectionChange();

        moduleFilter.id = "qunit-modulefilter";
        moduleFilter.appendChild( label );
        moduleFilter.appendChild( dropDown ) ;
        addEvent( moduleFilter, "submit", interceptNavigation );
        addEvent( moduleFilter, "reset", function() {

                // Let the reset happen, then update styles
                window.setTimeout( selectionChange );
        } );

        // Enables show/hide for the dropdown
        function searchFocus() {
                if ( dropDown.style.display !== "none" ) {
                        return;
                }

                dropDown.style.display = "block";
                addEvent( document, "click", hideHandler );
                addEvent( document, "keydown", hideHandler );

                // Hide on Escape keydown or outside-container click
                function hideHandler( e )  {
                        var inContainer = moduleFilter.contains( e.target );

                        if ( e.keyCode === 27 || !inContainer ) {
                                if ( e.keyCode === 27 && inContainer ) {
                                        moduleSearch.focus();
                                }
                                dropDown.style.display = "none";
                                removeEvent( document, "click", hideHandler );
                                removeEvent( document, "keydown", hideHandler );
                                moduleSearch.value = "";
                                searchInput();
                        }
                }
        }

        // Processes module search box input
        function searchInput() {
                var i, item,
                        searchText = moduleSearch.value.toLowerCase(),
                        listItems = dropDownList.children;

                for ( i = 0; i < listItems.length; i++ ) {
                        item = listItems[ i ];
                        if ( !searchText || item.textContent.toLowerCase().indexOf( searchText ) > -1 ) {
                                item.style.display = "";
                        } else {
                                item.style.display = "none";
                        }
                }
        }

        // Processes selection changes
        function selectionChange( evt ) {
                var i, item,
                        checkbox = evt && evt.target || allCheckbox,
                        modulesList = dropDownList.getElementsByTagName( "input" ),
                        selectedNames = [];

                toggleClass( checkbox.parentNode, "checked", checkbox.checked );

                dirty = false;
                if ( checkbox.checked && checkbox !== allCheckbox ) {
                   allCheckbox.checked = false;
                   removeClass( allCheckbox.parentNode, "checked" );
                }
                for ( i = 0; i < modulesList.length; i++ )  {
                        item = modulesList[ i ];
                        if ( !evt ) {
                                toggleClass( item.parentNode, "checked", item.checked );
                        } else if ( checkbox === allCheckbox && checkbox.checked ) {
                                item.checked = false;
                                removeClass( item.parentNode, "checked" );
                        }
                        dirty = dirty || ( item.checked !== item.defaultChecked );
                        if ( item.checked ) {
                                selectedNames.push( item.parentNode.textContent );
                        }
                }

                commit.style.display = reset.style.display = dirty ? "" : "none";
                moduleSearch.placeholder = selectedNames.join( ", " ) || allCheckbox.parentNode.textContent;
                moduleSearch.title = "Type to filter list. Current selection:\n" +
                        ( selectedNames.join( "\n" ) || allCheckbox.parentNode.textContent );
        }

        return moduleFilter;
}

function appendToolbar() {
        var toolbar = id( "qunit-testrunner-toolbar" );

        if ( toolbar ) {
                toolbar.appendChild( toolbarUrlConfigContainer() );
                toolbar.appendChild( toolbarModuleFilter() );
                toolbar.appendChild( toolbarLooseFilter() );
                toolbar.appendChild( document.createElement( "div" ) ).className = "clearfix";
        }
}

function appendHeader() {
        var header = id( "qunit-header" );

        if ( header ) {
                header.innerHTML = "<a href='" + escapeText( unfilteredUrl ) + "'>" + header.innerHTML +
                        "</a> ";
        }
}

function appendBanner() {
        var banner = id( "qunit-banner" );

        if ( banner ) {
                banner.className = "";
        }
}

function appendTestResults() {
        var tests = id( "qunit-tests" ),
                result = id( "qunit-testresult" );

        if ( result ) {
                result.parentNode.removeChild( result );
        }

        if ( tests ) {
                tests.innerHTML = "";
                result = document.createElement( "p" );
                result.id = "qunit-testresult";
                result.className = "result";
                tests.parentNode.insertBefore( result, tests );
                result.innerHTML = "Running...<br />&#160;";
        }
}

function appendFilteredTest() {
        var testId = QUnit.config.testId;
        if ( !testId || testId.length <= 0 ) {
                return "";
        }
        return "<div id='qunit-filteredTest'>Rerunning selected tests: " +
                escapeText( testId.join( ", " ) ) +
                " <a id='qunit-clearFilter' href='" +
                escapeText( unfilteredUrl ) +
                "'>Run all tests</a></div>";
}

function appendUserAgent() {
        var userAgent = id( "qunit-userAgent" );

        if ( userAgent ) {
                userAgent.innerHTML = "";
                userAgent.appendChild(
                        document.createTextNode(
                                "QUnit " + QUnit.version + "; " + navigator.userAgent
                        )
                );
        }
}

function appendInterface() {
        var qunit = id( "qunit" );

        if ( qunit ) {
                qunit.innerHTML =
                        "<h1 id='qunit-header'>" + escapeText( document.title ) + "</h1>" +
                        "<h2 id='qunit-banner'></h2>" +
                        "<div id='qunit-testrunner-toolbar'></div>" +
                        appendFilteredTest() +
                        "<h2 id='qunit-userAgent'></h2>" +
                        "<ol id='qunit-tests'></ol>";
        }

        appendHeader();
        appendBanner();
        appendTestResults();
        appendUserAgent();
        appendToolbar();
}

function appendTestsList( modules ) {
        var i, l, x, z, test, moduleObj;

        for ( i = 0, l = modules.length; i < l; i++ ) {
                moduleObj = modules[ i ];

                for ( x = 0, z = moduleObj.tests.length; x < z; x++ ) {
                        test = moduleObj.tests[ x ];

                        appendTest( test.name, test.testId, moduleObj.name );
                }
        }
}

function appendTest( name, testId, moduleName ) {
        var title, rerunTrigger, testBlock, assertList,
                tests = id( "qunit-tests" );

        if ( !tests ) {
                return;
        }

        title = document.createElement( "strong" );
        title.innerHTML = getNameHtml( name, moduleName );

        rerunTrigger = document.createElement( "a" );
        rerunTrigger.innerHTML = "Rerun";
        rerunTrigger.href = setUrl( { testId: testId } );

        testBlock = document.createElement( "li" );
        testBlock.appendChild( title );
        testBlock.appendChild( rerunTrigger );
        testBlock.id = "qunit-test-output-" + testId;

        assertList = document.createElement( "ol" );
        assertList.className = "qunit-assert-list";

        testBlock.appendChild( assertList );

        tests.appendChild( testBlock );
}

// HTML Reporter initialization and load
QUnit.begin( function( details ) {
        var i, moduleObj, tests;

        // Sort modules by name for the picker
        for ( i = 0; i < details.modules.length; i++ ) {
                moduleObj = details.modules[ i ];
                if ( moduleObj.name ) {
                        modulesList.push( moduleObj.name );
                }
        }
        modulesList.sort( function( a, b ) {
                return a.localeCompare( b );
        } );

        // Initialize QUnit elements
        appendInterface();
        appendTestsList( details.modules );
        tests = id( "qunit-tests" );
        if ( tests && config.hidepassed ) {
                addClass( tests, "hidepass" );
        }
} );

QUnit.done( function( details ) {
        var i, key,
                banner = id( "qunit-banner" ),
                tests = id( "qunit-tests" ),
                html = [
                        "Tests completed in ",
                        details.runtime,
                        " milliseconds.<br />",
                        "<span class='passed'>",
                        details.passed,
                        "</span> assertions of <span class='total'>",
                        details.total,
                        "</span> passed, <span class='failed'>",
                        details.failed,
                        "</span> failed."
                ].join( "" );

        if ( banner ) {
                banner.className = details.failed ? "qunit-fail" : "qunit-pass";
        }

        if ( tests ) {
                id( "qunit-testresult" ).innerHTML = html;
        }

        if ( config.altertitle && document.title ) {

                // Show ✖ for good, ✔ for bad suite result in title
                // use escape sequences in case file gets loaded with non-utf-8-charset
                document.title = [
                        ( details.failed ? "\u2716" : "\u2714" ),
                        document.title.replace( /^[\u2714\u2716] /i, "" )
                ].join( " " );
        }

        // Clear own sessionStorage items if all tests passed
        if ( config.reorder && defined.sessionStorage && details.failed === 0 ) {
                for ( i = 0; i < sessionStorage.length; i++ ) {
                        key = sessionStorage.key( i++ );
                        if ( key.indexOf( "qunit-test-" ) === 0 ) {
                                sessionStorage.removeItem( key );
                        }
                }
        }

        // Scroll back to top to show results
        if ( config.scrolltop && window.scrollTo ) {
                window.scrollTo( 0, 0 );
        }
} );

function getNameHtml( name, module ) {
        var nameHtml = "";

        if ( module ) {
                nameHtml = "<span class='module-name'>" + escapeText( module ) + "</span>: ";
        }

        nameHtml += "<span class='test-name'>" + escapeText( name ) + "</span>";

        return nameHtml;
}

QUnit.testStart( function( details ) {
        var running, testBlock, bad;

        testBlock = id( "qunit-test-output-" + details.testId );
        if ( testBlock ) {
                testBlock.className = "running";
        } else {

                // Report later registered tests
                appendTest( details.name, details.testId, details.module );
        }

        running = id( "qunit-testresult" );
        if ( running ) {
                bad = QUnit.config.reorder && defined.sessionStorage &&
                        +sessionStorage.getItem( "qunit-test-" + details.module + "-" + details.name );

                running.innerHTML = ( bad ?
                        "Rerunning previously failed test: <br />" :
                        "Running: <br />" ) +
                        getNameHtml( details.name, details.module );
        }

} );

function stripHtml( string ) {

        // Strip tags, html entity and whitespaces
        return string.replace( /<\/?[^>]+(>|$)/g, "" ).replace( /\&quot;/g, "" ).replace( /\s+/g, "" );
}

QUnit.log( function( details ) {
        var assertList, assertLi,
                message, expected, actual, diff,
                showDiff = false,
                testItem = id( "qunit-test-output-" + details.testId );

        if ( !testItem ) {
                return;
        }

        message = escapeText( details.message ) || ( details.result ? "okay" : "failed" );
        message = "<span class='test-message'>" + message + "</span>";
        message += "<span class='runtime'>@ " + details.runtime + " ms</span>";

        // The pushFailure doesn't provide details.expected
        // when it calls, it's implicit to also not show expected and diff stuff
        // Also, we need to check details.expected existence, as it can exist and be undefined
        if ( !details.result && hasOwn.call( details, "expected" ) ) {
                if ( details.negative ) {
                        expected = "NOT " + QUnit.dump.parse( details.expected );
                } else {
                        expected = QUnit.dump.parse( details.expected );
                }

                actual = QUnit.dump.parse( details.actual );
                message += "<table><tr class='test-expected'><th>Expected: </th><td><pre>" +
                        escapeText( expected ) +
                        "</pre></td></tr>";

                if ( actual !== expected ) {

                        message += "<tr class='test-actual'><th>Result: </th><td><pre>" +
                                escapeText( actual ) + "</pre></td></tr>";

                        // Don't show diff if actual or expected are booleans
                        if ( !( /^(true|false)$/.test( actual ) ) &&
                                        !( /^(true|false)$/.test( expected ) ) ) {
                                diff = QUnit.diff( expected, actual );
                                showDiff = stripHtml( diff ).length !==
                                        stripHtml( expected ).length +
                                        stripHtml( actual ).length;
                        }

                        // Don't show diff if expected and actual are totally different
                        if ( showDiff ) {
                                message += "<tr class='test-diff'><th>Diff: </th><td><pre>" +
                                        diff + "</pre></td></tr>";
                        }
                } else if ( expected.indexOf( "[object Array]" ) !== -1 ||
                                expected.indexOf( "[object Object]" ) !== -1 ) {
                        message += "<tr class='test-message'><th>Message: </th><td>" +
                                "Diff suppressed as the depth of object is more than current max depth (" +
                                QUnit.config.maxDepth + ").<p>Hint: Use <code>QUnit.dump.maxDepth</code> to " +
                                " run with a higher max depth or <a href='" +
                                escapeText( setUrl( { maxDepth: -1 } ) ) + "'>" +
                                "Rerun</a> without max depth.</p></td></tr>";
                } else {
                        message += "<tr class='test-message'><th>Message: </th><td>" +
                                "Diff suppressed as the expected and actual results have an equivalent" +
                                " serialization</td></tr>";
                }

                if ( details.source ) {
                        message += "<tr class='test-source'><th>Source: </th><td><pre>" +
                                escapeText( details.source ) + "</pre></td></tr>";
                }

                message += "</table>";

        // This occurs when pushFailure is set and we have an extracted stack trace
        } else if ( !details.result && details.source ) {
                message += "<table>" +
                        "<tr class='test-source'><th>Source: </th><td><pre>" +
                        escapeText( details.source ) + "</pre></td></tr>" +
                        "</table>";
        }

        assertList = testItem.getElementsByTagName( "ol" )[ 0 ];

        assertLi = document.createElement( "li" );
        assertLi.className = details.result ? "pass" : "fail";
        assertLi.innerHTML = message;
        assertList.appendChild( assertLi );
} );

QUnit.testDone( function( details ) {
        var testTitle, time, testItem, assertList,
                good, bad, testCounts, skipped, sourceName,
                tests = id( "qunit-tests" );

        if ( !tests ) {
                return;
        }

        testItem = id( "qunit-test-output-" + details.testId );

        assertList = testItem.getElementsByTagName( "ol" )[ 0 ];

        good = details.passed;
        bad = details.failed;

        // Store result when possible
        if ( config.reorder && defined.sessionStorage ) {
                if ( bad ) {
                        sessionStorage.setItem( "qunit-test-" + details.module + "-" + details.name, bad );
                } else {
                        sessionStorage.removeItem( "qunit-test-" + details.module + "-" + details.name );
                }
        }

        if ( bad === 0 ) {

                // Collapse the passing tests
                addClass( assertList, "qunit-collapsed" );
        } else if ( bad && config.collapse && !collapseNext ) {

                // Skip collapsing the first failing test
                collapseNext = true;
        } else {

                // Collapse remaining tests
                addClass( assertList, "qunit-collapsed" );
        }

        // The testItem.firstChild is the test name
        testTitle = testItem.firstChild;

        testCounts = bad ?
                "<b class='failed'>" + bad + "</b>, " + "<b class='passed'>" + good + "</b>, " :
                "";

        testTitle.innerHTML += " <b class='counts'>(" + testCounts +
                details.assertions.length + ")</b>";

        if ( details.skipped ) {
                testItem.className = "skipped";
                skipped = document.createElement( "em" );
                skipped.className = "qunit-skipped-label";
                skipped.innerHTML = "skipped";
                testItem.insertBefore( skipped, testTitle );
        } else {
                addEvent( testTitle, "click", function() {
                        toggleClass( assertList, "qunit-collapsed" );
                } );

                testItem.className = bad ? "fail" : "pass";

                time = document.createElement( "span" );
                time.className = "runtime";
                time.innerHTML = details.runtime + " ms";
                testItem.insertBefore( time, assertList );
        }

        // Show the source of the test when showing assertions
        if ( details.source ) {
                sourceName = document.createElement( "p" );
                sourceName.innerHTML = "<strong>Source: </strong>" + details.source;
                addClass( sourceName, "qunit-source" );
                if ( bad === 0 ) {
                        addClass( sourceName, "qunit-collapsed" );
                }
                addEvent( testTitle, "click", function() {
                        toggleClass( sourceName, "qunit-collapsed" );
                } );
                testItem.appendChild( sourceName );
        }
} );

// Avoid readyState issue with phantomjs
// Ref: #818
var notPhantom = ( function( p ) {
        return !( p && p.version && p.version.major > 0 );
} )( window.phantom );

if ( notPhantom && document.readyState === "complete" ) {
        QUnit.load();
} else {
        addEvent( window, "load", QUnit.load );
}

/*
 * This file is a modified version of google-diff-match-patch's JavaScript implementation
 * (https://code.google.com/p/google-diff-match-patch/source/browse/trunk/javascript/diff_match_patch_uncompressed.js),
 * modifications are licensed as more fully set forth in LICENSE.txt.
 *
 * The original source of google-diff-match-patch is attributable and licensed as follows:
 *
 * Copyright 2006 Google Inc.
 * https://code.google.com/p/google-diff-match-patch/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * More Info:
 *  https://code.google.com/p/google-diff-match-patch/
 *
 * Usage: QUnit.diff(expected, actual)
 *
 */
QUnit.diff = ( function() {
        function DiffMatchPatch() {
        }

        //  DIFF FUNCTIONS

        /**
         * The data structure representing a diff is an array of tuples:
         * [[DIFF_DELETE, 'Hello'], [DIFF_INSERT, 'Goodbye'], [DIFF_EQUAL, ' world.']]
         * which means: delete 'Hello', add 'Goodbye' and keep ' world.'
         */
        var DIFF_DELETE = -1,
                DIFF_INSERT = 1,
                DIFF_EQUAL = 0;

        /**
         * Find the differences between two texts.  Simplifies the problem by stripping
         * any common prefix or suffix off the texts before diffing.
         * @param {string} text1 Old string to be diffed.
         * @param {string} text2 New string to be diffed.
         * @param {boolean=} optChecklines Optional speedup flag. If present and false,
         *     then don't run a line-level diff first to identify the changed areas.
         *     Defaults to true, which does a faster, slightly less optimal diff.
         * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
         */
        DiffMatchPatch.prototype.DiffMain = function( text1, text2, optChecklines ) {
                var deadline, checklines, commonlength,
                        commonprefix, commonsuffix, diffs;

                // The diff must be complete in up to 1 second.
                deadline = ( new Date() ).getTime() + 1000;

                // Check for null inputs.
                if ( text1 === null || text2 === null ) {
                        throw new Error( "Null input. (DiffMain)" );
                }

                // Check for equality (speedup).
                if ( text1 === text2 ) {
                        if ( text1 ) {
                                return [
                                        [ DIFF_EQUAL, text1 ]
                                ];
                        }
                        return [];
                }

                if ( typeof optChecklines === "undefined" ) {
                        optChecklines = true;
                }

                checklines = optChecklines;

                // Trim off common prefix (speedup).
                commonlength = this.diffCommonPrefix( text1, text2 );
                commonprefix = text1.substring( 0, commonlength );
                text1 = text1.substring( commonlength );
                text2 = text2.substring( commonlength );

                // Trim off common suffix (speedup).
                commonlength = this.diffCommonSuffix( text1, text2 );
                commonsuffix = text1.substring( text1.length - commonlength );
                text1 = text1.substring( 0, text1.length - commonlength );
                text2 = text2.substring( 0, text2.length - commonlength );

                // Compute the diff on the middle block.
                diffs = this.diffCompute( text1, text2, checklines, deadline );

                // Restore the prefix and suffix.
                if ( commonprefix ) {
                        diffs.unshift( [ DIFF_EQUAL, commonprefix ] );
                }
                if ( commonsuffix ) {
                        diffs.push( [ DIFF_EQUAL, commonsuffix ] );
                }
                this.diffCleanupMerge( diffs );
                return diffs;
        };

        /**
         * Reduce the number of edits by eliminating operationally trivial equalities.
         * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
         */
        DiffMatchPatch.prototype.diffCleanupEfficiency = function( diffs ) {
                var changes, equalities, equalitiesLength, lastequality,
                        pointer, preIns, preDel, postIns, postDel;
                changes = false;
                equalities = []; // Stack of indices where equalities are found.
                equalitiesLength = 0; // Keeping our own length var is faster in JS.
                /** @type {?string} */
                lastequality = null;

                // Always equal to diffs[equalities[equalitiesLength - 1]][1]
                pointer = 0; // Index of current position.

                // Is there an insertion operation before the last equality.
                preIns = false;

                // Is there a deletion operation before the last equality.
                preDel = false;

                // Is there an insertion operation after the last equality.
                postIns = false;

                // Is there a deletion operation after the last equality.
                postDel = false;
                while ( pointer < diffs.length ) {

                        // Equality found.
                        if ( diffs[ pointer ][ 0 ] === DIFF_EQUAL ) {
                                if ( diffs[ pointer ][ 1 ].length < 4 && ( postIns || postDel ) ) {

                                        // Candidate found.
                                        equalities[ equalitiesLength++ ] = pointer;
                                        preIns = postIns;
                                        preDel = postDel;
                                        lastequality = diffs[ pointer ][ 1 ];
                                } else {

                                        // Not a candidate, and can never become one.
                                        equalitiesLength = 0;
                                        lastequality = null;
                                }
                                postIns = postDel = false;

                        // An insertion or deletion.
                        } else {

                                if ( diffs[ pointer ][ 0 ] === DIFF_DELETE ) {
                                        postDel = true;
                                } else {
                                        postIns = true;
                                }

                                /*
                                 * Five types to be split:
                                 * <ins>A</ins><del>B</del>XY<ins>C</ins><del>D</del>
                                 * <ins>A</ins>X<ins>C</ins><del>D</del>
                                 * <ins>A</ins><del>B</del>X<ins>C</ins>
                                 * <ins>A</del>X<ins>C</ins><del>D</del>
                                 * <ins>A</ins><del>B</del>X<del>C</del>
                                 */
                                if ( lastequality && ( ( preIns && preDel && postIns && postDel ) ||
                                                ( ( lastequality.length < 2 ) &&
                                                ( preIns + preDel + postIns + postDel ) === 3 ) ) ) {

                                        // Duplicate record.
                                        diffs.splice(
                                                equalities[ equalitiesLength - 1 ],
                                                0,
                                                [ DIFF_DELETE, lastequality ]
                                        );

                                        // Change second copy to insert.
                                        diffs[ equalities[ equalitiesLength - 1 ] + 1 ][ 0 ] = DIFF_INSERT;
                                        equalitiesLength--; // Throw away the equality we just deleted;
                                        lastequality = null;
                                        if ( preIns && preDel ) {

                                                // No changes made which could affect previous entry, keep going.
                                                postIns = postDel = true;
                                                equalitiesLength = 0;
                                        } else {
                                                equalitiesLength--; // Throw away the previous equality.
                                                pointer = equalitiesLength > 0 ? equalities[ equalitiesLength - 1 ] : -1;
                                                postIns = postDel = false;
                                        }
                                        changes = true;
                                }
                        }
                        pointer++;
                }

                if ( changes ) {
                        this.diffCleanupMerge( diffs );
                }
        };

        /**
         * Convert a diff array into a pretty HTML report.
         * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
         * @param {integer} string to be beautified.
         * @return {string} HTML representation.
         */
        DiffMatchPatch.prototype.diffPrettyHtml = function( diffs ) {
                var op, data, x,
                        html = [];
                for ( x = 0; x < diffs.length; x++ ) {
                        op = diffs[ x ][ 0 ]; // Operation (insert, delete, equal)
                        data = diffs[ x ][ 1 ]; // Text of change.
                        switch ( op ) {
                        case DIFF_INSERT:
                                html[ x ] = "<ins>" + escapeText( data ) + "</ins>";
                                break;
                        case DIFF_DELETE:
                                html[ x ] = "<del>" + escapeText( data ) + "</del>";
                                break;
                        case DIFF_EQUAL:
                                html[ x ] = "<span>" + escapeText( data ) + "</span>";
                                break;
                        }
                }
                return html.join( "" );
        };

        /**
         * Determine the common prefix of two strings.
         * @param {string} text1 First string.
         * @param {string} text2 Second string.
         * @return {number} The number of characters common to the start of each
         *     string.
         */
        DiffMatchPatch.prototype.diffCommonPrefix = function( text1, text2 ) {
                var pointermid, pointermax, pointermin, pointerstart;

                // Quick check for common null cases.
                if ( !text1 || !text2 || text1.charAt( 0 ) !== text2.charAt( 0 ) ) {
                        return 0;
                }

                // Binary search.
                // Performance analysis: https://neil.fraser.name/news/2007/10/09/
                pointermin = 0;
                pointermax = Math.min( text1.length, text2.length );
                pointermid = pointermax;
                pointerstart = 0;
                while ( pointermin < pointermid ) {
                        if ( text1.substring( pointerstart, pointermid ) ===
                                        text2.substring( pointerstart, pointermid ) ) {
                                pointermin = pointermid;
                                pointerstart = pointermin;
                        } else {
                                pointermax = pointermid;
                        }
                        pointermid = Math.floor( ( pointermax - pointermin ) / 2 + pointermin );
                }
                return pointermid;
        };

        /**
         * Determine the common suffix of two strings.
         * @param {string} text1 First string.
         * @param {string} text2 Second string.
         * @return {number} The number of characters common to the end of each string.
         */
        DiffMatchPatch.prototype.diffCommonSuffix = function( text1, text2 ) {
                var pointermid, pointermax, pointermin, pointerend;

                // Quick check for common null cases.
                if ( !text1 ||
                                !text2 ||
                                text1.charAt( text1.length - 1 ) !== text2.charAt( text2.length - 1 ) ) {
                        return 0;
                }

                // Binary search.
                // Performance analysis: https://neil.fraser.name/news/2007/10/09/
                pointermin = 0;
                pointermax = Math.min( text1.length, text2.length );
                pointermid = pointermax;
                pointerend = 0;
                while ( pointermin < pointermid ) {
                        if ( text1.substring( text1.length - pointermid, text1.length - pointerend ) ===
                                        text2.substring( text2.length - pointermid, text2.length - pointerend ) ) {
                                pointermin = pointermid;
                                pointerend = pointermin;
                        } else {
                                pointermax = pointermid;
                        }
                        pointermid = Math.floor( ( pointermax - pointermin ) / 2 + pointermin );
                }
                return pointermid;
        };

        /**
         * Find the differences between two texts.  Assumes that the texts do not
         * have any common prefix or suffix.
         * @param {string} text1 Old string to be diffed.
         * @param {string} text2 New string to be diffed.
         * @param {boolean} checklines Speedup flag.  If false, then don't run a
         *     line-level diff first to identify the changed areas.
         *     If true, then run a faster, slightly less optimal diff.
         * @param {number} deadline Time when the diff should be complete by.
         * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
         * @private
         */
        DiffMatchPatch.prototype.diffCompute = function( text1, text2, checklines, deadline ) {
                var diffs, longtext, shorttext, i, hm,
                        text1A, text2A, text1B, text2B,
                        midCommon, diffsA, diffsB;

                if ( !text1 ) {

                        // Just add some text (speedup).
                        return [
                                [ DIFF_INSERT, text2 ]
                        ];
                }

                if ( !text2 ) {

                        // Just delete some text (speedup).
                        return [
                                [ DIFF_DELETE, text1 ]
                        ];
                }

                longtext = text1.length > text2.length ? text1 : text2;
                shorttext = text1.length > text2.length ? text2 : text1;
                i = longtext.indexOf( shorttext );
                if ( i !== -1 ) {

                        // Shorter text is inside the longer text (speedup).
                        diffs = [
                                [ DIFF_INSERT, longtext.substring( 0, i ) ],
                                [ DIFF_EQUAL, shorttext ],
                                [ DIFF_INSERT, longtext.substring( i + shorttext.length ) ]
                        ];

                        // Swap insertions for deletions if diff is reversed.
                        if ( text1.length > text2.length ) {
                                diffs[ 0 ][ 0 ] = diffs[ 2 ][ 0 ] = DIFF_DELETE;
                        }
                        return diffs;
                }

                if ( shorttext.length === 1 ) {

                        // Single character string.
                        // After the previous speedup, the character can't be an equality.
                        return [
                                [ DIFF_DELETE, text1 ],
                                [ DIFF_INSERT, text2 ]
                        ];
                }

                // Check to see if the problem can be split in two.
                hm = this.diffHalfMatch( text1, text2 );
                if ( hm ) {

                        // A half-match was found, sort out the return data.
                        text1A = hm[ 0 ];
                        text1B = hm[ 1 ];
                        text2A = hm[ 2 ];
                        text2B = hm[ 3 ];
                        midCommon = hm[ 4 ];

                        // Send both pairs off for separate processing.
                        diffsA = this.DiffMain( text1A, text2A, checklines, deadline );
                        diffsB = this.DiffMain( text1B, text2B, checklines, deadline );

                        // Merge the results.
                        return diffsA.concat( [
                                [ DIFF_EQUAL, midCommon ]
                        ], diffsB );
                }

                if ( checklines && text1.length > 100 && text2.length > 100 ) {
                        return this.diffLineMode( text1, text2, deadline );
                }

                return this.diffBisect( text1, text2, deadline );
        };

        /**
         * Do the two texts share a substring which is at least half the length of the
         * longer text?
         * This speedup can produce non-minimal diffs.
         * @param {string} text1 First string.
         * @param {string} text2 Second string.
         * @return {Array.<string>} Five element Array, containing the prefix of
         *     text1, the suffix of text1, the prefix of text2, the suffix of
         *     text2 and the common middle.  Or null if there was no match.
         * @private
         */
        DiffMatchPatch.prototype.diffHalfMatch = function( text1, text2 ) {
                var longtext, shorttext, dmp,
                        text1A, text2B, text2A, text1B, midCommon,
                        hm1, hm2, hm;

                longtext = text1.length > text2.length ? text1 : text2;
                shorttext = text1.length > text2.length ? text2 : text1;
                if ( longtext.length < 4 || shorttext.length * 2 < longtext.length ) {
                        return null; // Pointless.
                }
                dmp = this; // 'this' becomes 'window' in a closure.

                /**
                 * Does a substring of shorttext exist within longtext such that the substring
                 * is at least half the length of longtext?
                 * Closure, but does not reference any external variables.
                 * @param {string} longtext Longer string.
                 * @param {string} shorttext Shorter string.
                 * @param {number} i Start index of quarter length substring within longtext.
                 * @return {Array.<string>} Five element Array, containing the prefix of
                 *     longtext, the suffix of longtext, the prefix of shorttext, the suffix
                 *     of shorttext and the common middle.  Or null if there was no match.
                 * @private
                 */
                function diffHalfMatchI( longtext, shorttext, i ) {
                        var seed, j, bestCommon, prefixLength, suffixLength,
                                bestLongtextA, bestLongtextB, bestShorttextA, bestShorttextB;

                        // Start with a 1/4 length substring at position i as a seed.
                        seed = longtext.substring( i, i + Math.floor( longtext.length / 4 ) );
                        j = -1;
                        bestCommon = "";
                        while ( ( j = shorttext.indexOf( seed, j + 1 ) ) !== -1 ) {
                                prefixLength = dmp.diffCommonPrefix( longtext.substring( i ),
                                        shorttext.substring( j ) );
                                suffixLength = dmp.diffCommonSuffix( longtext.substring( 0, i ),
                                        shorttext.substring( 0, j ) );
                                if ( bestCommon.length < suffixLength + prefixLength ) {
                                        bestCommon = shorttext.substring( j - suffixLength, j ) +
                                                shorttext.substring( j, j + prefixLength );
                                        bestLongtextA = longtext.substring( 0, i - suffixLength );
                                        bestLongtextB = longtext.substring( i + prefixLength );
                                        bestShorttextA = shorttext.substring( 0, j - suffixLength );
                                        bestShorttextB = shorttext.substring( j + prefixLength );
                                }
                        }
                        if ( bestCommon.length * 2 >= longtext.length ) {
                                return [ bestLongtextA, bestLongtextB,
                                        bestShorttextA, bestShorttextB, bestCommon
                                ];
                        } else {
                                return null;
                        }
                }

                // First check if the second quarter is the seed for a half-match.
                hm1 = diffHalfMatchI( longtext, shorttext,
                        Math.ceil( longtext.length / 4 ) );

                // Check again based on the third quarter.
                hm2 = diffHalfMatchI( longtext, shorttext,
                        Math.ceil( longtext.length / 2 ) );
                if ( !hm1 && !hm2 ) {
                        return null;
                } else if ( !hm2 ) {
                        hm = hm1;
                } else if ( !hm1 ) {
                        hm = hm2;
                } else {

                        // Both matched.  Select the longest.
                        hm = hm1[ 4 ].length > hm2[ 4 ].length ? hm1 : hm2;
                }

                // A half-match was found, sort out the return data.
                text1A, text1B, text2A, text2B;
                if ( text1.length > text2.length ) {
                        text1A = hm[ 0 ];
                        text1B = hm[ 1 ];
                        text2A = hm[ 2 ];
                        text2B = hm[ 3 ];
                } else {
                        text2A = hm[ 0 ];
                        text2B = hm[ 1 ];
                        text1A = hm[ 2 ];
                        text1B = hm[ 3 ];
                }
                midCommon = hm[ 4 ];
                return [ text1A, text1B, text2A, text2B, midCommon ];
        };

        /**
         * Do a quick line-level diff on both strings, then rediff the parts for
         * greater accuracy.
         * This speedup can produce non-minimal diffs.
         * @param {string} text1 Old string to be diffed.
         * @param {string} text2 New string to be diffed.
         * @param {number} deadline Time when the diff should be complete by.
         * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
         * @private
         */
        DiffMatchPatch.prototype.diffLineMode = function( text1, text2, deadline ) {
                var a, diffs, linearray, pointer, countInsert,
                        countDelete, textInsert, textDelete, j;

                // Scan the text on a line-by-line basis first.
                a = this.diffLinesToChars( text1, text2 );
                text1 = a.chars1;
                text2 = a.chars2;
                linearray = a.lineArray;

                diffs = this.DiffMain( text1, text2, false, deadline );

                // Convert the diff back to original text.
                this.diffCharsToLines( diffs, linearray );

                // Eliminate freak matches (e.g. blank lines)
                this.diffCleanupSemantic( diffs );

                // Rediff any replacement blocks, this time character-by-character.
                // Add a dummy entry at the end.
                diffs.push( [ DIFF_EQUAL, "" ] );
                pointer = 0;
                countDelete = 0;
                countInsert = 0;
                textDelete = "";
                textInsert = "";
                while ( pointer < diffs.length ) {
                        switch ( diffs[ pointer ][ 0 ] ) {
                        case DIFF_INSERT:
                                countInsert++;
                                textInsert += diffs[ pointer ][ 1 ];
                                break;
                        case DIFF_DELETE:
                                countDelete++;
                                textDelete += diffs[ pointer ][ 1 ];
                                break;
                        case DIFF_EQUAL:

                                // Upon reaching an equality, check for prior redundancies.
                                if ( countDelete >= 1 && countInsert >= 1 ) {

                                        // Delete the offending records and add the merged ones.
                                        diffs.splice( pointer - countDelete - countInsert,
                                                countDelete + countInsert );
                                        pointer = pointer - countDelete - countInsert;
                                        a = this.DiffMain( textDelete, textInsert, false, deadline );
                                        for ( j = a.length - 1; j >= 0; j-- ) {
                                                diffs.splice( pointer, 0, a[ j ] );
                                        }
                                        pointer = pointer + a.length;
                                }
                                countInsert = 0;
                                countDelete = 0;
                                textDelete = "";
                                textInsert = "";
                                break;
                        }
                        pointer++;
                }
                diffs.pop(); // Remove the dummy entry at the end.

                return diffs;
        };

        /**
         * Find the 'middle snake' of a diff, split the problem in two
         * and return the recursively constructed diff.
         * See Myers 1986 paper: An O(ND) Difference Algorithm and Its Variations.
         * @param {string} text1 Old string to be diffed.
         * @param {string} text2 New string to be diffed.
         * @param {number} deadline Time at which to bail if not yet complete.
         * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
         * @private
         */
        DiffMatchPatch.prototype.diffBisect = function( text1, text2, deadline ) {
                var text1Length, text2Length, maxD, vOffset, vLength,
                        v1, v2, x, delta, front, k1start, k1end, k2start,
                        k2end, k2Offset, k1Offset, x1, x2, y1, y2, d, k1, k2;

                // Cache the text lengths to prevent multiple calls.
                text1Length = text1.length;
                text2Length = text2.length;
                maxD = Math.ceil( ( text1Length + text2Length ) / 2 );
                vOffset = maxD;
                vLength = 2 * maxD;
                v1 = new Array( vLength );
                v2 = new Array( vLength );

                // Setting all elements to -1 is faster in Chrome & Firefox than mixing
                // integers and undefined.
                for ( x = 0; x < vLength; x++ ) {
                        v1[ x ] = -1;
                        v2[ x ] = -1;
                }
                v1[ vOffset + 1 ] = 0;
                v2[ vOffset + 1 ] = 0;
                delta = text1Length - text2Length;

                // If the total number of characters is odd, then the front path will collide
                // with the reverse path.
                front = ( delta % 2 !== 0 );

                // Offsets for start and end of k loop.
                // Prevents mapping of space beyond the grid.
                k1start = 0;
                k1end = 0;
                k2start = 0;
                k2end = 0;
                for ( d = 0; d < maxD; d++ ) {

                        // Bail out if deadline is reached.
                        if ( ( new Date() ).getTime() > deadline ) {
                                break;
                        }

                        // Walk the front path one step.
                        for ( k1 = -d + k1start; k1 <= d - k1end; k1 += 2 ) {
                                k1Offset = vOffset + k1;
                                if ( k1 === -d || ( k1 !== d && v1[ k1Offset - 1 ] < v1[ k1Offset + 1 ] ) ) {
                                        x1 = v1[ k1Offset + 1 ];
                                } else {
                                        x1 = v1[ k1Offset - 1 ] + 1;
                                }
                                y1 = x1 - k1;
                                while ( x1 < text1Length && y1 < text2Length &&
                                        text1.charAt( x1 ) === text2.charAt( y1 ) ) {
                                        x1++;
                                        y1++;
                                }
                                v1[ k1Offset ] = x1;
                                if ( x1 > text1Length ) {

                                        // Ran off the right of the graph.
                                        k1end += 2;
                                } else if ( y1 > text2Length ) {

                                        // Ran off the bottom of the graph.
                                        k1start += 2;
                                } else if ( front ) {
                                        k2Offset = vOffset + delta - k1;
                                        if ( k2Offset >= 0 && k2Offset < vLength && v2[ k2Offset ] !== -1 ) {

                                                // Mirror x2 onto top-left coordinate system.
                                                x2 = text1Length - v2[ k2Offset ];
                                                if ( x1 >= x2 ) {

                                                        // Overlap detected.
                                                        return this.diffBisectSplit( text1, text2, x1, y1, deadline );
                                                }
                                        }
                                }
                        }

                        // Walk the reverse path one step.
                        for ( k2 = -d + k2start; k2 <= d - k2end; k2 += 2 ) {
                                k2Offset = vOffset + k2;
                                if ( k2 === -d || ( k2 !== d && v2[ k2Offset - 1 ] < v2[ k2Offset + 1 ] ) ) {
                                        x2 = v2[ k2Offset + 1 ];
                                } else {
                                        x2 = v2[ k2Offset - 1 ] + 1;
                                }
                                y2 = x2 - k2;
                                while ( x2 < text1Length && y2 < text2Length &&
                                        text1.charAt( text1Length - x2 - 1 ) ===
                                        text2.charAt( text2Length - y2 - 1 ) ) {
                                        x2++;
                                        y2++;
                                }
                                v2[ k2Offset ] = x2;
                                if ( x2 > text1Length ) {

                                        // Ran off the left of the graph.
                                        k2end += 2;
                                } else if ( y2 > text2Length ) {

                                        // Ran off the top of the graph.
                                        k2start += 2;
                                } else if ( !front ) {
                                        k1Offset = vOffset + delta - k2;
                                        if ( k1Offset >= 0 && k1Offset < vLength && v1[ k1Offset ] !== -1 ) {
                                                x1 = v1[ k1Offset ];
                                                y1 = vOffset + x1 - k1Offset;

                                                // Mirror x2 onto top-left coordinate system.
                                                x2 = text1Length - x2;
                                                if ( x1 >= x2 ) {

                                                        // Overlap detected.
                                                        return this.diffBisectSplit( text1, text2, x1, y1, deadline );
                                                }
                                        }
                                }
                        }
                }

                // Diff took too long and hit the deadline or
                // number of diffs equals number of characters, no commonality at all.
                return [
                        [ DIFF_DELETE, text1 ],
                        [ DIFF_INSERT, text2 ]
                ];
        };

        /**
         * Given the location of the 'middle snake', split the diff in two parts
         * and recurse.
         * @param {string} text1 Old string to be diffed.
         * @param {string} text2 New string to be diffed.
         * @param {number} x Index of split point in text1.
         * @param {number} y Index of split point in text2.
         * @param {number} deadline Time at which to bail if not yet complete.
         * @return {!Array.<!DiffMatchPatch.Diff>} Array of diff tuples.
         * @private
         */
        DiffMatchPatch.prototype.diffBisectSplit = function( text1, text2, x, y, deadline ) {
                var text1a, text1b, text2a, text2b, diffs, diffsb;
                text1a = text1.substring( 0, x );
                text2a = text2.substring( 0, y );
                text1b = text1.substring( x );
                text2b = text2.substring( y );

                // Compute both diffs serially.
                diffs = this.DiffMain( text1a, text2a, false, deadline );
                diffsb = this.DiffMain( text1b, text2b, false, deadline );

                return diffs.concat( diffsb );
        };

        /**
         * Reduce the number of edits by eliminating semantically trivial equalities.
         * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
         */
        DiffMatchPatch.prototype.diffCleanupSemantic = function( diffs ) {
                var changes, equalities, equalitiesLength, lastequality,
                        pointer, lengthInsertions2, lengthDeletions2, lengthInsertions1,
                        lengthDeletions1, deletion, insertion, overlapLength1, overlapLength2;
                changes = false;
                equalities = []; // Stack of indices where equalities are found.
                equalitiesLength = 0; // Keeping our own length var is faster in JS.
                /** @type {?string} */
                lastequality = null;

                // Always equal to diffs[equalities[equalitiesLength - 1]][1]
                pointer = 0; // Index of current position.

                // Number of characters that changed prior to the equality.
                lengthInsertions1 = 0;
                lengthDeletions1 = 0;

                // Number of characters that changed after the equality.
                lengthInsertions2 = 0;
                lengthDeletions2 = 0;
                while ( pointer < diffs.length ) {
                        if ( diffs[ pointer ][ 0 ] === DIFF_EQUAL ) { // Equality found.
                                equalities[ equalitiesLength++ ] = pointer;
                                lengthInsertions1 = lengthInsertions2;
                                lengthDeletions1 = lengthDeletions2;
                                lengthInsertions2 = 0;
                                lengthDeletions2 = 0;
                                lastequality = diffs[ pointer ][ 1 ];
                        } else { // An insertion or deletion.
                                if ( diffs[ pointer ][ 0 ] === DIFF_INSERT ) {
                                        lengthInsertions2 += diffs[ pointer ][ 1 ].length;
                                } else {
                                        lengthDeletions2 += diffs[ pointer ][ 1 ].length;
                                }

                                // Eliminate an equality that is smaller or equal to the edits on both
                                // sides of it.
                                if ( lastequality && ( lastequality.length <=
                                                Math.max( lengthInsertions1, lengthDeletions1 ) ) &&
                                                ( lastequality.length <= Math.max( lengthInsertions2,
                                                        lengthDeletions2 ) ) ) {

                                        // Duplicate record.
                                        diffs.splice(
                                                equalities[ equalitiesLength - 1 ],
                                                0,
                                                [ DIFF_DELETE, lastequality ]
                                        );

                                        // Change second copy to insert.
                                        diffs[ equalities[ equalitiesLength - 1 ] + 1 ][ 0 ] = DIFF_INSERT;

                                        // Throw away the equality we just deleted.
                                        equalitiesLength--;

                                        // Throw away the previous equality (it needs to be reevaluated).
                                        equalitiesLength--;
                                        pointer = equalitiesLength > 0 ? equalities[ equalitiesLength - 1 ] : -1;

                                        // Reset the counters.
                                        lengthInsertions1 = 0;
                                        lengthDeletions1 = 0;
                                        lengthInsertions2 = 0;
                                        lengthDeletions2 = 0;
                                        lastequality = null;
                                        changes = true;
                                }
                        }
                        pointer++;
                }

                // Normalize the diff.
                if ( changes ) {
                        this.diffCleanupMerge( diffs );
                }

                // Find any overlaps between deletions and insertions.
                // e.g: <del>abcxxx</del><ins>xxxdef</ins>
                //   -> <del>abc</del>xxx<ins>def</ins>
                // e.g: <del>xxxabc</del><ins>defxxx</ins>
                //   -> <ins>def</ins>xxx<del>abc</del>
                // Only extract an overlap if it is as big as the edit ahead or behind it.
                pointer = 1;
                while ( pointer < diffs.length ) {
                        if ( diffs[ pointer - 1 ][ 0 ] === DIFF_DELETE &&
                                        diffs[ pointer ][ 0 ] === DIFF_INSERT ) {
                                deletion = diffs[ pointer - 1 ][ 1 ];
                                insertion = diffs[ pointer ][ 1 ];
                                overlapLength1 = this.diffCommonOverlap( deletion, insertion );
                                overlapLength2 = this.diffCommonOverlap( insertion, deletion );
                                if ( overlapLength1 >= overlapLength2 ) {
                                        if ( overlapLength1 >= deletion.length / 2 ||
                                                        overlapLength1 >= insertion.length / 2 ) {

                                                // Overlap found.  Insert an equality and trim the surrounding edits.
                                                diffs.splice(
                                                        pointer,
                                                        0,
                                                        [ DIFF_EQUAL, insertion.substring( 0, overlapLength1 ) ]
                                                );
                                                diffs[ pointer - 1 ][ 1 ] =
                                                        deletion.substring( 0, deletion.length - overlapLength1 );
                                                diffs[ pointer + 1 ][ 1 ] = insertion.substring( overlapLength1 );
                                                pointer++;
                                        }
                                } else {
                                        if ( overlapLength2 >= deletion.length / 2 ||
                                                        overlapLength2 >= insertion.length / 2 ) {

                                                // Reverse overlap found.
                                                // Insert an equality and swap and trim the surrounding edits.
                                                diffs.splice(
                                                        pointer,
                                                        0,
                                                        [ DIFF_EQUAL, deletion.substring( 0, overlapLength2 ) ]
                                                );

                                                diffs[ pointer - 1 ][ 0 ] = DIFF_INSERT;
                                                diffs[ pointer - 1 ][ 1 ] =
                                                        insertion.substring( 0, insertion.length - overlapLength2 );
                                                diffs[ pointer + 1 ][ 0 ] = DIFF_DELETE;
                                                diffs[ pointer + 1 ][ 1 ] =
                                                        deletion.substring( overlapLength2 );
                                                pointer++;
                                        }
                                }
                                pointer++;
                        }
                        pointer++;
                }
        };

        /**
         * Determine if the suffix of one string is the prefix of another.
         * @param {string} text1 First string.
         * @param {string} text2 Second string.
         * @return {number} The number of characters common to the end of the first
         *     string and the start of the second string.
         * @private
         */
        DiffMatchPatch.prototype.diffCommonOverlap = function( text1, text2 ) {
                var text1Length, text2Length, textLength,
                        best, length, pattern, found;

                // Cache the text lengths to prevent multiple calls.
                text1Length = text1.length;
                text2Length = text2.length;

                // Eliminate the null case.
                if ( text1Length === 0 || text2Length === 0 ) {
                        return 0;
                }

                // Truncate the longer string.
                if ( text1Length > text2Length ) {
                        text1 = text1.substring( text1Length - text2Length );
                } else if ( text1Length < text2Length ) {
                        text2 = text2.substring( 0, text1Length );
                }
                textLength = Math.min( text1Length, text2Length );

                // Quick check for the worst case.
                if ( text1 === text2 ) {
                        return textLength;
                }

                // Start by looking for a single character match
                // and increase length until no match is found.
                // Performance analysis: https://neil.fraser.name/news/2010/11/04/
                best = 0;
                length = 1;
                while ( true ) {
                        pattern = text1.substring( textLength - length );
                        found = text2.indexOf( pattern );
                        if ( found === -1 ) {
                                return best;
                        }
                        length += found;
                        if ( found === 0 || text1.substring( textLength - length ) ===
                                        text2.substring( 0, length ) ) {
                                best = length;
                                length++;
                        }
                }
        };

        /**
         * Split two texts into an array of strings.  Reduce the texts to a string of
         * hashes where each Unicode character represents one line.
         * @param {string} text1 First string.
         * @param {string} text2 Second string.
         * @return {{chars1: string, chars2: string, lineArray: !Array.<string>}}
         *     An object containing the encoded text1, the encoded text2 and
         *     the array of unique strings.
         *     The zeroth element of the array of unique strings is intentionally blank.
         * @private
         */
        DiffMatchPatch.prototype.diffLinesToChars = function( text1, text2 ) {
                var lineArray, lineHash, chars1, chars2;
                lineArray = []; // E.g. lineArray[4] === 'Hello\n'
                lineHash = {};  // E.g. lineHash['Hello\n'] === 4

                // '\x00' is a valid character, but various debuggers don't like it.
                // So we'll insert a junk entry to avoid generating a null character.
                lineArray[ 0 ] = "";

                /**
                 * Split a text into an array of strings.  Reduce the texts to a string of
                 * hashes where each Unicode character represents one line.
                 * Modifies linearray and linehash through being a closure.
                 * @param {string} text String to encode.
                 * @return {string} Encoded string.
                 * @private
                 */
                function diffLinesToCharsMunge( text ) {
                        var chars, lineStart, lineEnd, lineArrayLength, line;
                        chars = "";

                        // Walk the text, pulling out a substring for each line.
                        // text.split('\n') would would temporarily double our memory footprint.
                        // Modifying text would create many large strings to garbage collect.
                        lineStart = 0;
                        lineEnd = -1;

                        // Keeping our own length variable is faster than looking it up.
                        lineArrayLength = lineArray.length;
                        while ( lineEnd < text.length - 1 ) {
                                lineEnd = text.indexOf( "\n", lineStart );
                                if ( lineEnd === -1 ) {
                                        lineEnd = text.length - 1;
                                }
                                line = text.substring( lineStart, lineEnd + 1 );
                                lineStart = lineEnd + 1;

                                if ( lineHash.hasOwnProperty ? lineHash.hasOwnProperty( line ) :
                                                        ( lineHash[ line ] !== undefined ) ) {
                                        chars += String.fromCharCode( lineHash[ line ] );
                                } else {
                                        chars += String.fromCharCode( lineArrayLength );
                                        lineHash[ line ] = lineArrayLength;
                                        lineArray[ lineArrayLength++ ] = line;
                                }
                        }
                        return chars;
                }

                chars1 = diffLinesToCharsMunge( text1 );
                chars2 = diffLinesToCharsMunge( text2 );
                return {
                        chars1: chars1,
                        chars2: chars2,
                        lineArray: lineArray
                };
        };

        /**
         * Rehydrate the text in a diff from a string of line hashes to real lines of
         * text.
         * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
         * @param {!Array.<string>} lineArray Array of unique strings.
         * @private
         */
        DiffMatchPatch.prototype.diffCharsToLines = function( diffs, lineArray ) {
                var x, chars, text, y;
                for ( x = 0; x < diffs.length; x++ ) {
                        chars = diffs[ x ][ 1 ];
                        text = [];
                        for ( y = 0; y < chars.length; y++ ) {
                                text[ y ] = lineArray[ chars.charCodeAt( y ) ];
                        }
                        diffs[ x ][ 1 ] = text.join( "" );
                }
        };

        /**
         * Reorder and merge like edit sections.  Merge equalities.
         * Any edit section can move as long as it doesn't cross an equality.
         * @param {!Array.<!DiffMatchPatch.Diff>} diffs Array of diff tuples.
         */
        DiffMatchPatch.prototype.diffCleanupMerge = function( diffs ) {
                var pointer, countDelete, countInsert, textInsert, textDelete,
                        commonlength, changes, diffPointer, position;
                diffs.push( [ DIFF_EQUAL, "" ] ); // Add a dummy entry at the end.
                pointer = 0;
                countDelete = 0;
                countInsert = 0;
                textDelete = "";
                textInsert = "";
                commonlength;
                while ( pointer < diffs.length ) {
                        switch ( diffs[ pointer ][ 0 ] ) {
                        case DIFF_INSERT:
                                countInsert++;
                                textInsert += diffs[ pointer ][ 1 ];
                                pointer++;
                                break;
                        case DIFF_DELETE:
                                countDelete++;
                                textDelete += diffs[ pointer ][ 1 ];
                                pointer++;
                                break;
                        case DIFF_EQUAL:

                                // Upon reaching an equality, check for prior redundancies.
                                if ( countDelete + countInsert > 1 ) {
                                        if ( countDelete !== 0 && countInsert !== 0 ) {

                                                // Factor out any common prefixes.
                                                commonlength = this.diffCommonPrefix( textInsert, textDelete );
                                                if ( commonlength !== 0 ) {
                                                        if ( ( pointer - countDelete - countInsert ) > 0 &&
                                                                        diffs[ pointer - countDelete - countInsert - 1 ][ 0 ] ===
                                                                        DIFF_EQUAL ) {
                                                                diffs[ pointer - countDelete - countInsert - 1 ][ 1 ] +=
                                                                        textInsert.substring( 0, commonlength );
                                                        } else {
                                                                diffs.splice( 0, 0, [ DIFF_EQUAL,
                                                                        textInsert.substring( 0, commonlength )
                                                                ] );
                                                                pointer++;
                                                        }
                                                        textInsert = textInsert.substring( commonlength );
                                                        textDelete = textDelete.substring( commonlength );
                                                }

                                                // Factor out any common suffixies.
                                                commonlength = this.diffCommonSuffix( textInsert, textDelete );
                                                if ( commonlength !== 0 ) {
                                                        diffs[ pointer ][ 1 ] = textInsert.substring( textInsert.length -
                                                                        commonlength ) + diffs[ pointer ][ 1 ];
                                                        textInsert = textInsert.substring( 0, textInsert.length -
                                                                commonlength );
                                                        textDelete = textDelete.substring( 0, textDelete.length -
                                                                commonlength );
                                                }
                                        }

                                        // Delete the offending records and add the merged ones.
                                        if ( countDelete === 0 ) {
                                                diffs.splice( pointer - countInsert,
                                                        countDelete + countInsert, [ DIFF_INSERT, textInsert ] );
                                        } else if ( countInsert === 0 ) {
                                                diffs.splice( pointer - countDelete,
                                                        countDelete + countInsert, [ DIFF_DELETE, textDelete ] );
                                        } else {
                                                diffs.splice(
                                                        pointer - countDelete - countInsert,
                                                        countDelete + countInsert,
                                                        [ DIFF_DELETE, textDelete ], [ DIFF_INSERT, textInsert ]
                                                );
                                        }
                                        pointer = pointer - countDelete - countInsert +
                                                ( countDelete ? 1 : 0 ) + ( countInsert ? 1 : 0 ) + 1;
                                } else if ( pointer !== 0 && diffs[ pointer - 1 ][ 0 ] === DIFF_EQUAL ) {

                                        // Merge this equality with the previous one.
                                        diffs[ pointer - 1 ][ 1 ] += diffs[ pointer ][ 1 ];
                                        diffs.splice( pointer, 1 );
                                } else {
                                        pointer++;
                                }
                                countInsert = 0;
                                countDelete = 0;
                                textDelete = "";
                                textInsert = "";
                                break;
                        }
                }
                if ( diffs[ diffs.length - 1 ][ 1 ] === "" ) {
                        diffs.pop(); // Remove the dummy entry at the end.
                }

                // Second pass: look for single edits surrounded on both sides by equalities
                // which can be shifted sideways to eliminate an equality.
                // e.g: A<ins>BA</ins>C -> <ins>AB</ins>AC
                changes = false;
                pointer = 1;

                // Intentionally ignore the first and last element (don't need checking).
                while ( pointer < diffs.length - 1 ) {
                        if ( diffs[ pointer - 1 ][ 0 ] === DIFF_EQUAL &&
                                        diffs[ pointer + 1 ][ 0 ] === DIFF_EQUAL ) {

                                diffPointer = diffs[ pointer ][ 1 ];
                                position = diffPointer.substring(
                                        diffPointer.length - diffs[ pointer - 1 ][ 1 ].length
                                );

                                // This is a single edit surrounded by equalities.
                                if ( position === diffs[ pointer - 1 ][ 1 ] ) {

                                        // Shift the edit over the previous equality.
                                        diffs[ pointer ][ 1 ] = diffs[ pointer - 1 ][ 1 ] +
                                                diffs[ pointer ][ 1 ].substring( 0, diffs[ pointer ][ 1 ].length -
                                                        diffs[ pointer - 1 ][ 1 ].length );
                                        diffs[ pointer + 1 ][ 1 ] =
                                                diffs[ pointer - 1 ][ 1 ] + diffs[ pointer + 1 ][ 1 ];
                                        diffs.splice( pointer - 1, 1 );
                                        changes = true;
                                } else if ( diffPointer.substring( 0, diffs[ pointer + 1 ][ 1 ].length ) ===
                                                diffs[ pointer + 1 ][ 1 ] ) {

                                        // Shift the edit over the next equality.
                                        diffs[ pointer - 1 ][ 1 ] += diffs[ pointer + 1 ][ 1 ];
                                        diffs[ pointer ][ 1 ] =
                                                diffs[ pointer ][ 1 ].substring( diffs[ pointer + 1 ][ 1 ].length ) +
                                                diffs[ pointer + 1 ][ 1 ];
                                        diffs.splice( pointer + 1, 1 );
                                        changes = true;
                                }
                        }
                        pointer++;
                }

                // If shifts were made, the diff needs reordering and another shift sweep.
                if ( changes ) {
                        this.diffCleanupMerge( diffs );
                }
        };

        return function( o, n ) {
                var diff, output, text;
                diff = new DiffMatchPatch();
                output = diff.DiffMain( o, n );
                diff.diffCleanupEfficiency( output );
                text = diff.diffPrettyHtml( output );

                return text;
        };
}() );

}() );