libgo/go/reflect/all_test.go

   1 // Copyright 2009 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package reflect_test
   6
   7 import (
   8         "container/vector"
   9         "fmt"
  10         "io"
  11         "os"
  12         . "reflect"
  13         "testing"
  14         "unsafe"
  15 )
  16
  17 type integer int
  18 type T struct {
  19         a int
  20         b float64
  21         c string
  22         d *int
  23 }
  24
  25 type pair struct {
  26         i interface{}
  27         s string
  28 }
  29
  30 func isDigit(c uint8) bool { return '0' <= c && c <= '9' }
  31
  32 func assert(t *testing.T, s, want string) {
  33         if s != want {
  34                 t.Errorf("have %#q want %#q", s, want)
  35         }
  36 }
  37
  38 func typestring(i interface{}) string { return Typeof(i).String() }
  39
  40 var typeTests = []pair{
  41         {struct{ x int }{}, "int"},
  42         {struct{ x int8 }{}, "int8"},
  43         {struct{ x int16 }{}, "int16"},
  44         {struct{ x int32 }{}, "int32"},
  45         {struct{ x int64 }{}, "int64"},
  46         {struct{ x uint }{}, "uint"},
  47         {struct{ x uint8 }{}, "uint8"},
  48         {struct{ x uint16 }{}, "uint16"},
  49         {struct{ x uint32 }{}, "uint32"},
  50         {struct{ x uint64 }{}, "uint64"},
  51         {struct{ x float }{}, "float"},
  52         {struct{ x float32 }{}, "float32"},
  53         {struct{ x float64 }{}, "float64"},
  54         {struct{ x int8 }{}, "int8"},
  55         {struct{ x (**int8) }{}, "**int8"},
  56         {struct{ x (**integer) }{}, "**reflect_test.integer"},
  57         {struct{ x ([32]int32) }{}, "[32]int32"},
  58         {struct{ x ([]int8) }{}, "[]int8"},
  59         {struct{ x (map[string]int32) }{}, "map[string] int32"},
  60         {struct{ x (chan<- string) }{}, "chan<- string"},
  61         {struct {
  62                 x struct {
  63                         c chan *int32
  64                         d float32
  65                 }
  66         }{},
  67                 "struct { c chan *int32; d float32 }",
  68         },
  69         {struct{ x (func(a int8, b int32)) }{}, "func(int8, int32)"},
  70         {struct {
  71                 x struct {
  72                         c func(chan *integer, *int8)
  73                 }
  74         }{},
  75                 "struct { c func(chan *reflect_test.integer, *int8) }",
  76         },
  77         {struct {
  78                 x struct {
  79                         a int8
  80                         b int32
  81                 }
  82         }{},
  83                 "struct { a int8; b int32 }",
  84         },
  85         {struct {
  86                 x struct {
  87                         a int8
  88                         b int8
  89                         c int32
  90                 }
  91         }{},
  92                 "struct { a int8; b int8; c int32 }",
  93         },
  94         {struct {
  95                 x struct {
  96                         a int8
  97                         b int8
  98                         c int8
  99                         d int32
 100                 }
 101         }{},
 102                 "struct { a int8; b int8; c int8; d int32 }",
 103         },
 104         {struct {
 105                 x struct {
 106                         a int8
 107                         b int8
 108                         c int8
 109                         d int8
 110                         e int32
 111                 }
 112         }{},
 113                 "struct { a int8; b int8; c int8; d int8; e int32 }",
 114         },
 115         {struct {
 116                 x struct {
 117                         a int8
 118                         b int8
 119                         c int8
 120                         d int8
 121                         e int8
 122                         f int32
 123                 }
 124         }{},
 125                 "struct { a int8; b int8; c int8; d int8; e int8; f int32 }",
 126         },
 127         {struct {
 128                 x struct {
 129                         a int8 "hi there"
 130                 }
 131         }{},
 132                 `struct { a int8 "hi there" }`,
 133         },
 134         {struct {
 135                 x struct {
 136                         a int8 "hi \x00there\t\n\"\\"
 137                 }
 138         }{},
 139                 `struct { a int8 "hi \x00there\t\n\"\\" }`,
 140         },
 141         {struct {
 142                 x struct {
 143                         f func(args ...int)
 144                 }
 145         }{},
 146                 "struct { f func(...int) }",
 147         },
 148         {struct {
 149                 x (interface {
 150                         a(func(func(int) int) func(func(int)) int)
 151                         b()
 152                 })
 153         }{},
 154                 "interface { a(func(func(int) int) func(func(int)) int); b() }",
 155         },
 156 }
 157
 158 var valueTests = []pair{
 159         {(int8)(0), "8"},
 160         {(int16)(0), "16"},
 161         {(int32)(0), "32"},
 162         {(int64)(0), "64"},
 163         {(uint8)(0), "8"},
 164         {(uint16)(0), "16"},
 165         {(uint32)(0), "32"},
 166         {(uint64)(0), "64"},
 167         {(float32)(0), "256.25"},
 168         {(float64)(0), "512.125"},
 169         {(string)(""), "stringy cheese"},
 170         {(bool)(false), "true"},
 171         {(*int8)(nil), "*int8(0)"},
 172         {(**int8)(nil), "**int8(0)"},
 173         {[5]int32{}, "[5]int32{0, 0, 0, 0, 0}"},
 174         {(**integer)(nil), "**reflect_test.integer(0)"},
 175         {(map[string]int32)(nil), "map[string] int32{<can't iterate on maps>}"},
 176         {(chan<- string)(nil), "chan<- string"},
 177         {struct {
 178                 c chan *int32
 179                 d float32
 180         }{},
 181                 "struct { c chan *int32; d float32 }{chan *int32, 0}",
 182         },
 183         {(func(a int8, b int32))(nil), "func(int8, int32)(0)"},
 184         {struct{ c func(chan *integer, *int8) }{},
 185                 "struct { c func(chan *reflect_test.integer, *int8) }{func(chan *reflect_test.integer, *int8)(0)}",
 186         },
 187         {struct {
 188                 a int8
 189                 b int32
 190         }{},
 191                 "struct { a int8; b int32 }{0, 0}",
 192         },
 193         {struct {
 194                 a int8
 195                 b int8
 196                 c int32
 197         }{},
 198                 "struct { a int8; b int8; c int32 }{0, 0, 0}",
 199         },
 200 }
 201
 202 func testType(t *testing.T, i int, typ Type, want string) {
 203         s := typ.String()
 204         if s != want {
 205                 t.Errorf("#%d: have %#q, want %#q", i, s, want)
 206         }
 207 }
 208
 209 func TestTypes(t *testing.T) {
 210         for i, tt := range typeTests {
 211                 testType(t, i, NewValue(tt.i).(*StructValue).Field(0).Type(), tt.s)
 212         }
 213 }
 214
 215 func TestSet(t *testing.T) {
 216         for i, tt := range valueTests {
 217                 v := NewValue(tt.i)
 218                 switch v := v.(type) {
 219                 case *IntValue:
 220                         switch v.Type().Kind() {
 221                         case Int:
 222                                 v.Set(132)
 223                         case Int8:
 224                                 v.Set(8)
 225                         case Int16:
 226                                 v.Set(16)
 227                         case Int32:
 228                                 v.Set(32)
 229                         case Int64:
 230                                 v.Set(64)
 231                         }
 232                 case *UintValue:
 233                         switch v.Type().Kind() {
 234                         case Uint:
 235                                 v.Set(132)
 236                         case Uint8:
 237                                 v.Set(8)
 238                         case Uint16:
 239                                 v.Set(16)
 240                         case Uint32:
 241                                 v.Set(32)
 242                         case Uint64:
 243                                 v.Set(64)
 244                         }
 245                 case *FloatValue:
 246                         switch v.Type().Kind() {
 247                         case Float:
 248                                 v.Set(128.5)
 249                         case Float32:
 250                                 v.Set(256.25)
 251                         case Float64:
 252                                 v.Set(512.125)
 253                         }
 254                 case *ComplexValue:
 255                         switch v.Type().Kind() {
 256                         case Complex:
 257                                 v.Set(53200.0 + 100i)
 258                         case Complex64:
 259                                 v.Set(532.125 + 10i)
 260                         case Complex128:
 261                                 v.Set(564.25 + 1i)
 262                         }
 263                 case *StringValue:
 264                         v.Set("stringy cheese")
 265                 case *BoolValue:
 266                         v.Set(true)
 267                 }
 268                 s := valueToString(v)
 269                 if s != tt.s {
 270                         t.Errorf("#%d: have %#q, want %#q", i, s, tt.s)
 271                 }
 272         }
 273 }
 274
 275 func TestSetValue(t *testing.T) {
 276         for i, tt := range valueTests {
 277                 v := NewValue(tt.i)
 278                 switch v := v.(type) {
 279                 case *IntValue:
 280                         switch v.Type().Kind() {
 281                         case Int:
 282                                 v.SetValue(NewValue(int(132)))
 283                         case Int8:
 284                                 v.SetValue(NewValue(int8(8)))
 285                         case Int16:
 286                                 v.SetValue(NewValue(int16(16)))
 287                         case Int32:
 288                                 v.SetValue(NewValue(int32(32)))
 289                         case Int64:
 290                                 v.SetValue(NewValue(int64(64)))
 291                         }
 292                 case *UintValue:
 293                         switch v.Type().Kind() {
 294                         case Uint:
 295                                 v.SetValue(NewValue(uint(132)))
 296                         case Uint8:
 297                                 v.SetValue(NewValue(uint8(8)))
 298                         case Uint16:
 299                                 v.SetValue(NewValue(uint16(16)))
 300                         case Uint32:
 301                                 v.SetValue(NewValue(uint32(32)))
 302                         case Uint64:
 303                                 v.SetValue(NewValue(uint64(64)))
 304                         }
 305                 case *FloatValue:
 306                         switch v.Type().Kind() {
 307                         case Float:
 308                                 v.SetValue(NewValue(float(128.5)))
 309                         case Float32:
 310                                 v.SetValue(NewValue(float32(256.25)))
 311                         case Float64:
 312                                 v.SetValue(NewValue(float64(512.125)))
 313                         }
 314                 case *ComplexValue:
 315                         switch v.Type().Kind() {
 316                         case Complex:
 317                                 v.SetValue(NewValue(complex(53200.0 + 100i)))
 318                         case Complex64:
 319                                 v.SetValue(NewValue(complex64(532.125 + 10i)))
 320                         case Complex128:
 321                                 v.SetValue(NewValue(complex128(564.25 + 1i)))
 322                         }
 323
 324                 case *StringValue:
 325                         v.SetValue(NewValue("stringy cheese"))
 326                 case *BoolValue:
 327                         v.SetValue(NewValue(true))
 328                 }
 329                 s := valueToString(v)
 330                 if s != tt.s {
 331                         t.Errorf("#%d: have %#q, want %#q", i, s, tt.s)
 332                 }
 333         }
 334 }
 335
 336 var _i = 7
 337
 338 var valueToStringTests = []pair{
 339         {123, "123"},
 340         {123.5, "123.5"},
 341         {byte(123), "123"},
 342         {"abc", "abc"},
 343         {T{123, 456.75, "hello", &_i}, "reflect_test.T{123, 456.75, hello, *int(&7)}"},
 344         {new(chan *T), "*chan *reflect_test.T(&chan *reflect_test.T)"},
 345         {[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}"},
 346         {&[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "*[10]int(&[10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})"},
 347         {[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}"},
 348         {&[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, "*[]int(&[]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})"},
 349 }
 350
 351 func TestValueToString(t *testing.T) {
 352         for i, test := range valueToStringTests {
 353                 s := valueToString(NewValue(test.i))
 354                 if s != test.s {
 355                         t.Errorf("#%d: have %#q, want %#q", i, s, test.s)
 356                 }
 357         }
 358 }
 359
 360 func TestArrayElemSet(t *testing.T) {
 361         v := NewValue([10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})
 362         v.(*ArrayValue).Elem(4).(*IntValue).Set(123)
 363         s := valueToString(v)
 364         const want = "[10]int{1, 2, 3, 4, 123, 6, 7, 8, 9, 10}"
 365         if s != want {
 366                 t.Errorf("[10]int: have %#q want %#q", s, want)
 367         }
 368
 369         v = NewValue([]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})
 370         v.(*SliceValue).Elem(4).(*IntValue).Set(123)
 371         s = valueToString(v)
 372         const want1 = "[]int{1, 2, 3, 4, 123, 6, 7, 8, 9, 10}"
 373         if s != want1 {
 374                 t.Errorf("[]int: have %#q want %#q", s, want1)
 375         }
 376 }
 377
 378 func TestPtrPointTo(t *testing.T) {
 379         var ip *int32
 380         var i int32 = 1234
 381         vip := NewValue(&ip)
 382         vi := NewValue(i)
 383         vip.(*PtrValue).Elem().(*PtrValue).PointTo(vi)
 384         if *ip != 1234 {
 385                 t.Errorf("got %d, want 1234", *ip)
 386         }
 387
 388         ip = nil
 389         vp := NewValue(ip).(*PtrValue)
 390         vp.PointTo(vp.Elem())
 391         if ip != nil {
 392                 t.Errorf("got non-nil (%p), want nil", ip)
 393         }
 394 }
 395
 396 func TestPtrSetNil(t *testing.T) {
 397         var i int32 = 1234
 398         ip := &i
 399         vip := NewValue(&ip)
 400         vip.(*PtrValue).Elem().(*PtrValue).Set(nil)
 401         if ip != nil {
 402                 t.Errorf("got non-nil (%d), want nil", *ip)
 403         }
 404 }
 405
 406 func TestMapSetNil(t *testing.T) {
 407         m := make(map[string]int)
 408         vm := NewValue(&m)
 409         vm.(*PtrValue).Elem().(*MapValue).Set(nil)
 410         if m != nil {
 411                 t.Errorf("got non-nil (%p), want nil", m)
 412         }
 413 }
 414
 415
 416 func TestAll(t *testing.T) {
 417         testType(t, 1, Typeof((int8)(0)), "int8")
 418         testType(t, 2, Typeof((*int8)(nil)).(*PtrType).Elem(), "int8")
 419
 420         typ := Typeof((*struct {
 421                 c chan *int32
 422                 d float32
 423         })(nil))
 424         testType(t, 3, typ, "*struct { c chan *int32; d float32 }")
 425         etyp := typ.(*PtrType).Elem()
 426         testType(t, 4, etyp, "struct { c chan *int32; d float32 }")
 427         styp := etyp.(*StructType)
 428         f := styp.Field(0)
 429         testType(t, 5, f.Type, "chan *int32")
 430
 431         f, present := styp.FieldByName("d")
 432         if !present {
 433                 t.Errorf("FieldByName says present field is absent")
 434         }
 435         testType(t, 6, f.Type, "float32")
 436
 437         f, present = styp.FieldByName("absent")
 438         if present {
 439                 t.Errorf("FieldByName says absent field is present")
 440         }
 441
 442         typ = Typeof([32]int32{})
 443         testType(t, 7, typ, "[32]int32")
 444         testType(t, 8, typ.(*ArrayType).Elem(), "int32")
 445
 446         typ = Typeof((map[string]*int32)(nil))
 447         testType(t, 9, typ, "map[string] *int32")
 448         mtyp := typ.(*MapType)
 449         testType(t, 10, mtyp.Key(), "string")
 450         testType(t, 11, mtyp.Elem(), "*int32")
 451
 452         typ = Typeof((chan<- string)(nil))
 453         testType(t, 12, typ, "chan<- string")
 454         testType(t, 13, typ.(*ChanType).Elem(), "string")
 455
 456         // make sure tag strings are not part of element type
 457         typ = Typeof(struct {
 458                 d []uint32 "TAG"
 459         }{}).(*StructType).Field(0).Type
 460         testType(t, 14, typ, "[]uint32")
 461 }
 462
 463 func TestInterfaceGet(t *testing.T) {
 464         var inter struct {
 465                 e interface{}
 466         }
 467         inter.e = 123.456
 468         v1 := NewValue(&inter)
 469         v2 := v1.(*PtrValue).Elem().(*StructValue).Field(0)
 470         assert(t, v2.Type().String(), "interface { }")
 471         i2 := v2.(*InterfaceValue).Interface()
 472         v3 := NewValue(i2)
 473         assert(t, v3.Type().String(), "float")
 474 }
 475
 476 func TestInterfaceValue(t *testing.T) {
 477         var inter struct {
 478                 e interface{}
 479         }
 480         inter.e = 123.456
 481         v1 := NewValue(&inter)
 482         v2 := v1.(*PtrValue).Elem().(*StructValue).Field(0)
 483         assert(t, v2.Type().String(), "interface { }")
 484         v3 := v2.(*InterfaceValue).Elem()
 485         assert(t, v3.Type().String(), "float")
 486
 487         i3 := v2.Interface()
 488         if _, ok := i3.(float); !ok {
 489                 t.Error("v2.Interface() did not return float, got ", Typeof(i3))
 490         }
 491 }
 492
 493 func TestFunctionValue(t *testing.T) {
 494         v := NewValue(func() {})
 495         if v.Interface() != v.Interface() {
 496                 t.Fatalf("TestFunction != itself")
 497         }
 498         assert(t, v.Type().String(), "func()")
 499 }
 500
 501 func TestCopyArray(t *testing.T) {
 502         a := []int{1, 2, 3, 4, 10, 9, 8, 7}
 503         b := []int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44}
 504         c := []int{11, 22, 33, 44, 1010, 99, 88, 77, 66, 55, 44}
 505         va := NewValue(&a)
 506         vb := NewValue(&b)
 507         for i := 0; i < len(b); i++ {
 508                 if b[i] != c[i] {
 509                         t.Fatalf("b != c before test")
 510                 }
 511         }
 512         aa := va.(*PtrValue).Elem().(*SliceValue)
 513         ab := vb.(*PtrValue).Elem().(*SliceValue)
 514         for tocopy := 1; tocopy <= 7; tocopy++ {
 515                 aa.SetLen(tocopy)
 516                 ArrayCopy(ab, aa)
 517                 aa.SetLen(8)
 518                 for i := 0; i < tocopy; i++ {
 519                         if a[i] != b[i] {
 520                                 t.Errorf("(i) tocopy=%d a[%d]=%d, b[%d]=%d",
 521                                         tocopy, i, a[i], i, b[i])
 522                         }
 523                 }
 524                 for i := tocopy; i < len(b); i++ {
 525                         if b[i] != c[i] {
 526                                 if i < len(a) {
 527                                         t.Errorf("(ii) tocopy=%d a[%d]=%d, b[%d]=%d, c[%d]=%d",
 528                                                 tocopy, i, a[i], i, b[i], i, c[i])
 529                                 } else {
 530                                         t.Errorf("(iii) tocopy=%d b[%d]=%d, c[%d]=%d",
 531                                                 tocopy, i, b[i], i, c[i])
 532                                 }
 533                         } else {
 534                                 t.Logf("tocopy=%d elem %d is okay\n", tocopy, i)
 535                         }
 536                 }
 537         }
 538 }
 539
 540 func TestBigUnnamedStruct(t *testing.T) {
 541         b := struct{ a, b, c, d int64 }{1, 2, 3, 4}
 542         v := NewValue(b)
 543         b1 := v.Interface().(struct {
 544                 a, b, c, d int64
 545         })
 546         if b1.a != b.a || b1.b != b.b || b1.c != b.c || b1.d != b.d {
 547                 t.Errorf("NewValue(%v).Interface().(*Big) = %v", b, b1)
 548         }
 549 }
 550
 551 type big struct {
 552         a, b, c, d, e int64
 553 }
 554
 555 func TestBigStruct(t *testing.T) {
 556         b := big{1, 2, 3, 4, 5}
 557         v := NewValue(b)
 558         b1 := v.Interface().(big)
 559         if b1.a != b.a || b1.b != b.b || b1.c != b.c || b1.d != b.d || b1.e != b.e {
 560                 t.Errorf("NewValue(%v).Interface().(big) = %v", b, b1)
 561         }
 562 }
 563
 564 type Basic struct {
 565         x int
 566         y float32
 567 }
 568
 569 type NotBasic Basic
 570
 571 type DeepEqualTest struct {
 572         a, b interface{}
 573         eq   bool
 574 }
 575
 576 var deepEqualTests = []DeepEqualTest{
 577         // Equalities
 578         {1, 1, true},
 579         {int32(1), int32(1), true},
 580         {0.5, 0.5, true},
 581         {float32(0.5), float32(0.5), true},
 582         {"hello", "hello", true},
 583         {make([]int, 10), make([]int, 10), true},
 584         {&[3]int{1, 2, 3}, &[3]int{1, 2, 3}, true},
 585         {Basic{1, 0.5}, Basic{1, 0.5}, true},
 586         {os.Error(nil), os.Error(nil), true},
 587         {map[int]string{1: "one", 2: "two"}, map[int]string{2: "two", 1: "one"}, true},
 588
 589         // Inequalities
 590         {1, 2, false},
 591         {int32(1), int32(2), false},
 592         {0.5, 0.6, false},
 593         {float32(0.5), float32(0.6), false},
 594         {"hello", "hey", false},
 595         {make([]int, 10), make([]int, 11), false},
 596         {&[3]int{1, 2, 3}, &[3]int{1, 2, 4}, false},
 597         {Basic{1, 0.5}, Basic{1, 0.6}, false},
 598         {Basic{1, 0}, Basic{2, 0}, false},
 599         {map[int]string{1: "one", 3: "two"}, map[int]string{2: "two", 1: "one"}, false},
 600         {map[int]string{1: "one", 2: "txo"}, map[int]string{2: "two", 1: "one"}, false},
 601         {map[int]string{1: "one"}, map[int]string{2: "two", 1: "one"}, false},
 602         {map[int]string{2: "two", 1: "one"}, map[int]string{1: "one"}, false},
 603         {nil, 1, false},
 604         {1, nil, false},
 605
 606         // Mismatched types
 607         {1, 1.0, false},
 608         {int32(1), int64(1), false},
 609         {0.5, "hello", false},
 610         {[]int{1, 2, 3}, [3]int{1, 2, 3}, false},
 611         {&[3]interface{}{1, 2, 4}, &[3]interface{}{1, 2, "s"}, false},
 612         {Basic{1, 0.5}, NotBasic{1, 0.5}, false},
 613         {map[uint]string{1: "one", 2: "two"}, map[int]string{2: "two", 1: "one"}, false},
 614 }
 615
 616 func TestDeepEqual(t *testing.T) {
 617         for _, test := range deepEqualTests {
 618                 if r := DeepEqual(test.a, test.b); r != test.eq {
 619                         t.Errorf("DeepEqual(%v, %v) = %v, want %v", test.a, test.b, r, test.eq)
 620                 }
 621         }
 622 }
 623
 624 func TestTypeof(t *testing.T) {
 625         for _, test := range deepEqualTests {
 626                 v := NewValue(test.a)
 627                 if v == nil {
 628                         continue
 629                 }
 630                 typ := Typeof(test.a)
 631                 if typ != v.Type() {
 632                         t.Errorf("Typeof(%v) = %v, but NewValue(%v).Type() = %v", test.a, typ, test.a, v.Type())
 633                 }
 634         }
 635 }
 636
 637 type Recursive struct {
 638         x int
 639         r *Recursive
 640 }
 641
 642 func TestDeepEqualRecursiveStruct(t *testing.T) {
 643         a, b := new(Recursive), new(Recursive)
 644         *a = Recursive{12, a}
 645         *b = Recursive{12, b}
 646         if !DeepEqual(a, b) {
 647                 t.Error("DeepEqual(recursive same) = false, want true")
 648         }
 649 }
 650
 651 type _Complex struct {
 652         a int
 653         b [3]*_Complex
 654         c *string
 655         d map[float]float
 656 }
 657
 658 func TestDeepEqualComplexStruct(t *testing.T) {
 659         m := make(map[float]float)
 660         stra, strb := "hello", "hello"
 661         a, b := new(_Complex), new(_Complex)
 662         *a = _Complex{5, [3]*_Complex{a, b, a}, &stra, m}
 663         *b = _Complex{5, [3]*_Complex{b, a, a}, &strb, m}
 664         if !DeepEqual(a, b) {
 665                 t.Error("DeepEqual(complex same) = false, want true")
 666         }
 667 }
 668
 669 func TestDeepEqualComplexStructInequality(t *testing.T) {
 670         m := make(map[float]float)
 671         stra, strb := "hello", "helloo" // Difference is here
 672         a, b := new(_Complex), new(_Complex)
 673         *a = _Complex{5, [3]*_Complex{a, b, a}, &stra, m}
 674         *b = _Complex{5, [3]*_Complex{b, a, a}, &strb, m}
 675         if DeepEqual(a, b) {
 676                 t.Error("DeepEqual(complex different) = true, want false")
 677         }
 678 }
 679
 680
 681 func check2ndField(x interface{}, offs uintptr, t *testing.T) {
 682         s := NewValue(x).(*StructValue)
 683         f := s.Type().(*StructType).Field(1)
 684         if f.Offset != offs {
 685                 t.Error("mismatched offsets in structure alignment:", f.Offset, offs)
 686         }
 687 }
 688
 689 // Check that structure alignment & offsets viewed through reflect agree with those
 690 // from the compiler itself.
 691 func TestAlignment(t *testing.T) {
 692         type T1inner struct {
 693                 a int
 694         }
 695         type T1 struct {
 696                 T1inner
 697                 f int
 698         }
 699         type T2inner struct {
 700                 a, b int
 701         }
 702         type T2 struct {
 703                 T2inner
 704                 f int
 705         }
 706
 707         x := T1{T1inner{2}, 17}
 708         check2ndField(x, uintptr(unsafe.Pointer(&x.f))-uintptr(unsafe.Pointer(&x)), t)
 709
 710         x1 := T2{T2inner{2, 3}, 17}
 711         check2ndField(x1, uintptr(unsafe.Pointer(&x1.f))-uintptr(unsafe.Pointer(&x1)), t)
 712 }
 713
 714 type IsNiller interface {
 715         IsNil() bool
 716 }
 717
 718 func Nil(a interface{}, t *testing.T) {
 719         n := NewValue(a).(*StructValue).Field(0).(IsNiller)
 720         if !n.IsNil() {
 721                 t.Errorf("%v should be nil", a)
 722         }
 723 }
 724
 725 func NotNil(a interface{}, t *testing.T) {
 726         n := NewValue(a).(*StructValue).Field(0).(IsNiller)
 727         if n.IsNil() {
 728                 t.Errorf("value of type %v should not be nil", NewValue(a).Type().String())
 729         }
 730 }
 731
 732 func TestIsNil(t *testing.T) {
 733         // These do not implement IsNil
 734         doNotNil := []interface{}{int(0), float32(0), struct{ a int }{}}
 735         for _, ts := range doNotNil {
 736                 ty := Typeof(ts)
 737                 v := MakeZero(ty)
 738                 if _, ok := v.(IsNiller); ok {
 739                         t.Errorf("%s is nilable; should not be", ts)
 740                 }
 741         }
 742
 743         // These do implement IsNil.
 744         // Wrap in extra struct to hide interface type.
 745         doNil := []interface{}{
 746                 struct{ x *int }{},
 747                 struct{ x interface{} }{},
 748                 struct{ x map[string]int }{},
 749                 struct{ x func() bool }{},
 750                 struct{ x chan int }{},
 751                 struct{ x []string }{},
 752         }
 753         for _, ts := range doNil {
 754                 ty := Typeof(ts).(*StructType).Field(0).Type
 755                 v := MakeZero(ty)
 756                 if _, ok := v.(IsNiller); !ok {
 757                         t.Errorf("%s %T is not nilable; should be", ts, v)
 758                 }
 759         }
 760
 761         // Check the implementations
 762         var pi struct {
 763                 x *int
 764         }
 765         Nil(pi, t)
 766         pi.x = new(int)
 767         NotNil(pi, t)
 768
 769         var si struct {
 770                 x []int
 771         }
 772         Nil(si, t)
 773         si.x = make([]int, 10)
 774         NotNil(si, t)
 775
 776         var ci struct {
 777                 x chan int
 778         }
 779         Nil(ci, t)
 780         ci.x = make(chan int)
 781         NotNil(ci, t)
 782
 783         var mi struct {
 784                 x map[int]int
 785         }
 786         Nil(mi, t)
 787         mi.x = make(map[int]int)
 788         NotNil(mi, t)
 789
 790         var ii struct {
 791                 x interface{}
 792         }
 793         Nil(ii, t)
 794         ii.x = 2
 795         NotNil(ii, t)
 796
 797         var fi struct {
 798                 x func(t *testing.T)
 799         }
 800         Nil(fi, t)
 801         fi.x = TestIsNil
 802         NotNil(fi, t)
 803 }
 804
 805 func TestInterfaceExtraction(t *testing.T) {
 806         var s struct {
 807                 w io.Writer
 808         }
 809
 810         s.w = os.Stdout
 811         v := Indirect(NewValue(&s)).(*StructValue).Field(0).Interface()
 812         if v != s.w.(interface{}) {
 813                 t.Error("Interface() on interface: ", v, s.w)
 814         }
 815 }
 816
 817 func TestInterfaceEditing(t *testing.T) {
 818         // strings are bigger than one word,
 819         // so the interface conversion allocates
 820         // memory to hold a string and puts that
 821         // pointer in the interface.
 822         var i interface{} = "hello"
 823
 824         // if i pass the interface value by value
 825         // to NewValue, i should get a fresh copy
 826         // of the value.
 827         v := NewValue(i)
 828
 829         // and setting that copy to "bye" should
 830         // not change the value stored in i.
 831         v.(*StringValue).Set("bye")
 832         if i.(string) != "hello" {
 833                 t.Errorf(`Set("bye") changed i to %s`, i.(string))
 834         }
 835
 836         // the same should be true of smaller items.
 837         i = 123
 838         v = NewValue(i)
 839         v.(*IntValue).Set(234)
 840         if i.(int) != 123 {
 841                 t.Errorf("Set(234) changed i to %d", i.(int))
 842         }
 843 }
 844
 845 func TestNilPtrValueSub(t *testing.T) {
 846         var pi *int
 847         if pv := NewValue(pi).(*PtrValue); pv.Elem() != nil {
 848                 t.Error("NewValue((*int)(nil)).(*PtrValue).Elem() != nil")
 849         }
 850 }
 851
 852 func TestMap(t *testing.T) {
 853         m := map[string]int{"a": 1, "b": 2}
 854         mv := NewValue(m).(*MapValue)
 855         if n := mv.Len(); n != len(m) {
 856                 t.Errorf("Len = %d, want %d", n, len(m))
 857         }
 858         keys := mv.Keys()
 859         i := 0
 860         newmap := MakeMap(mv.Type().(*MapType))
 861         for k, v := range m {
 862                 // Check that returned Keys match keys in range.
 863                 // These aren't required to be in the same order,
 864                 // but they are in this implementation, which makes
 865                 // the test easier.
 866                 if i >= len(keys) {
 867                         t.Errorf("Missing key #%d %q", i, k)
 868                 } else if kv := keys[i].(*StringValue); kv.Get() != k {
 869                         t.Errorf("Keys[%d] = %q, want %q", i, kv.Get(), k)
 870                 }
 871                 i++
 872
 873                 // Check that value lookup is correct.
 874                 vv := mv.Elem(NewValue(k))
 875                 if vi := vv.(*IntValue).Get(); vi != int64(v) {
 876                         t.Errorf("Key %q: have value %d, want %d", vi, v)
 877                 }
 878
 879                 // Copy into new map.
 880                 newmap.SetElem(NewValue(k), NewValue(v))
 881         }
 882         vv := mv.Elem(NewValue("not-present"))
 883         if vv != nil {
 884                 t.Errorf("Invalid key: got non-nil value %s", valueToString(vv))
 885         }
 886
 887         newm := newmap.Interface().(map[string]int)
 888         if len(newm) != len(m) {
 889                 t.Errorf("length after copy: newm=%d, m=%d", newm, m)
 890         }
 891
 892         for k, v := range newm {
 893                 mv, ok := m[k]
 894                 if mv != v {
 895                         t.Errorf("newm[%q] = %d, but m[%q] = %d, %v", k, v, k, mv, ok)
 896                 }
 897         }
 898
 899         newmap.SetElem(NewValue("a"), nil)
 900         v, ok := newm["a"]
 901         if ok {
 902                 t.Errorf("newm[\"a\"] = %d after delete", v)
 903         }
 904
 905         mv = NewValue(&m).(*PtrValue).Elem().(*MapValue)
 906         mv.Set(nil)
 907         if m != nil {
 908                 t.Errorf("mv.Set(nil) failed")
 909         }
 910 }
 911
 912 func TestChan(t *testing.T) {
 913         for loop := 0; loop < 2; loop++ {
 914                 var c chan int
 915                 var cv *ChanValue
 916
 917                 // check both ways to allocate channels
 918                 switch loop {
 919                 case 1:
 920                         c = make(chan int, 1)
 921                         cv = NewValue(c).(*ChanValue)
 922                 case 0:
 923                         cv = MakeChan(Typeof(c).(*ChanType), 1)
 924                         c = cv.Interface().(chan int)
 925                 }
 926
 927                 // Send
 928                 cv.Send(NewValue(2))
 929                 if i := <-c; i != 2 {
 930                         t.Errorf("reflect Send 2, native recv %d", i)
 931                 }
 932
 933                 // Recv
 934                 c <- 3
 935                 if i := cv.Recv().(*IntValue).Get(); i != 3 {
 936                         t.Errorf("native send 3, reflect Recv %d", i)
 937                 }
 938
 939                 // TryRecv fail
 940                 val := cv.TryRecv()
 941                 if val != nil {
 942                         t.Errorf("TryRecv on empty chan: %s", valueToString(val))
 943                 }
 944
 945                 // TryRecv success
 946                 c <- 4
 947                 val = cv.TryRecv()
 948                 if val == nil {
 949                         t.Errorf("TryRecv on ready chan got nil")
 950                 } else if i := val.(*IntValue).Get(); i != 4 {
 951                         t.Errorf("native send 4, TryRecv %d", i)
 952                 }
 953
 954                 // TrySend fail
 955                 c <- 100
 956                 ok := cv.TrySend(NewValue(5))
 957                 i := <-c
 958                 if ok {
 959                         t.Errorf("TrySend on full chan succeeded: value %d", i)
 960                 }
 961
 962                 // TrySend success
 963                 ok = cv.TrySend(NewValue(6))
 964                 if !ok {
 965                         t.Errorf("TrySend on empty chan failed")
 966                 } else {
 967                         if i = <-c; i != 6 {
 968                                 t.Errorf("TrySend 6, recv %d", i)
 969                         }
 970                 }
 971
 972                 // Close
 973                 c <- 123
 974                 cv.Close()
 975                 if cv.Closed() {
 976                         t.Errorf("closed too soon - 1")
 977                 }
 978                 if i := cv.Recv().(*IntValue).Get(); i != 123 {
 979                         t.Errorf("send 123 then close; Recv %d", i)
 980                 }
 981                 if cv.Closed() {
 982                         t.Errorf("closed too soon - 2")
 983                 }
 984                 if i := cv.Recv().(*IntValue).Get(); i != 0 {
 985                         t.Errorf("after close Recv %d", i)
 986                 }
 987                 if !cv.Closed() {
 988                         t.Errorf("not closed")
 989                 }
 990         }
 991
 992         // check creation of unbuffered channel
 993         var c chan int
 994         cv := MakeChan(Typeof(c).(*ChanType), 0)
 995         c = cv.Interface().(chan int)
 996         if cv.TrySend(NewValue(7)) {
 997                 t.Errorf("TrySend on sync chan succeeded")
 998         }
 999         if cv.TryRecv() != nil {
1000                 t.Errorf("TryRecv on sync chan succeeded")
1001         }
1002
1003         // len/cap
1004         cv = MakeChan(Typeof(c).(*ChanType), 10)
1005         c = cv.Interface().(chan int)
1006         for i := 0; i < 3; i++ {
1007                 c <- i
1008         }
1009         if l, m := cv.Len(), cv.Cap(); l != len(c) || m != cap(c) {
1010                 t.Errorf("Len/Cap = %d/%d want %d/%d", l, m, len(c), cap(c))
1011         }
1012
1013 }
1014
1015 // Difficult test for function call because of
1016 // implicit padding between arguments.
1017 func dummy(b byte, c int, d byte) (i byte, j int, k byte) {
1018         return b, c, d
1019 }
1020
1021 func TestFunc(t *testing.T) {
1022         ret := NewValue(dummy).(*FuncValue).Call([]Value{NewValue(byte(10)), NewValue(20), NewValue(byte(30))})
1023         if len(ret) != 3 {
1024                 t.Fatalf("Call returned %d values, want 3", len(ret))
1025         }
1026
1027         i := ret[0].(*UintValue).Get()
1028         j := ret[1].(*IntValue).Get()
1029         k := ret[2].(*UintValue).Get()
1030         if i != 10 || j != 20 || k != 30 {
1031                 t.Errorf("Call returned %d, %d, %d; want 10, 20, 30", i, j, k)
1032         }
1033 }
1034
1035 type Point struct {
1036         x, y int
1037 }
1038
1039 func (p Point) Dist(scale int) int { return p.x*p.x*scale + p.y*p.y*scale }
1040
1041 func TestMethod(t *testing.T) {
1042         // Non-curried method of type.
1043         p := Point{3, 4}
1044         i := Typeof(p).Method(0).Func.Call([]Value{NewValue(p), NewValue(10)})[0].(*IntValue).Get()
1045         if i != 250 {
1046                 t.Errorf("Type Method returned %d; want 250", i)
1047         }
1048
1049         i = Typeof(&p).Method(0).Func.Call([]Value{NewValue(&p), NewValue(10)})[0].(*IntValue).Get()
1050         if i != 250 {
1051                 t.Errorf("Pointer Type Method returned %d; want 250", i)
1052         }
1053
1054         // Curried method of value.
1055         i = NewValue(p).Method(0).Call([]Value{NewValue(10)})[0].(*IntValue).Get()
1056         if i != 250 {
1057                 t.Errorf("Value Method returned %d; want 250", i)
1058         }
1059
1060         // Curried method of interface value.
1061         // Have to wrap interface value in a struct to get at it.
1062         // Passing it to NewValue directly would
1063         // access the underlying Point, not the interface.
1064         var s = struct {
1065                 x interface {
1066                         Dist(int) int
1067                 }
1068         }{p}
1069         pv := NewValue(s).(*StructValue).Field(0)
1070         i = pv.Method(0).Call([]Value{NewValue(10)})[0].(*IntValue).Get()
1071         if i != 250 {
1072                 t.Errorf("Interface Method returned %d; want 250", i)
1073         }
1074 }
1075
1076 func TestInterfaceSet(t *testing.T) {
1077         p := &Point{3, 4}
1078
1079         var s struct {
1080                 I interface{}
1081                 P interface {
1082                         Dist(int) int
1083                 }
1084         }
1085         sv := NewValue(&s).(*PtrValue).Elem().(*StructValue)
1086         sv.Field(0).(*InterfaceValue).Set(NewValue(p))
1087         if q := s.I.(*Point); q != p {
1088                 t.Errorf("i: have %p want %p", q, p)
1089         }
1090
1091         pv := sv.Field(1).(*InterfaceValue)
1092         pv.Set(NewValue(p))
1093         if q := s.P.(*Point); q != p {
1094                 t.Errorf("i: have %p want %p", q, p)
1095         }
1096
1097         i := pv.Method(0).Call([]Value{NewValue(10)})[0].(*IntValue).Get()
1098         if i != 250 {
1099                 t.Errorf("Interface Method returned %d; want 250", i)
1100         }
1101 }
1102
1103 type T1 struct {
1104         a string
1105         int
1106 }
1107
1108 func TestAnonymousFields(t *testing.T) {
1109         var field StructField
1110         var ok bool
1111         var t1 T1
1112         type1 := Typeof(t1).(*StructType)
1113         if field, ok = type1.FieldByName("int"); !ok {
1114                 t.Error("no field 'int'")
1115         }
1116         if field.Index[0] != 1 {
1117                 t.Error("field index should be 1; is", field.Index)
1118         }
1119 }
1120
1121 type FTest struct {
1122         s     interface{}
1123         name  string
1124         index []int
1125         value int
1126 }
1127
1128 type D1 struct {
1129         d int
1130 }
1131 type D2 struct {
1132         d int
1133 }
1134
1135 type S0 struct {
1136         a, b, c int
1137         D1
1138         D2
1139 }
1140
1141 type S1 struct {
1142         b int
1143         S0
1144 }
1145
1146 type S2 struct {
1147         a int
1148         *S1
1149 }
1150
1151 type S1x struct {
1152         S1
1153 }
1154
1155 type S1y struct {
1156         S1
1157 }
1158
1159 type S3 struct {
1160         S1x
1161         S2
1162         d, e int
1163         *S1y
1164 }
1165
1166 type S4 struct {
1167         *S4
1168         a int
1169 }
1170
1171 var fieldTests = []FTest{
1172         {struct{}{}, "", nil, 0},
1173         {struct{}{}, "foo", nil, 0},
1174         {S0{a: 'a'}, "a", []int{0}, 'a'},
1175         {S0{}, "d", nil, 0},
1176         {S1{S0: S0{a: 'a'}}, "a", []int{1, 0}, 'a'},
1177         {S1{b: 'b'}, "b", []int{0}, 'b'},
1178         {S1{}, "S0", []int{1}, 0},
1179         {S1{S0: S0{c: 'c'}}, "c", []int{1, 2}, 'c'},
1180         {S2{a: 'a'}, "a", []int{0}, 'a'},
1181         {S2{}, "S1", []int{1}, 0},
1182         {S2{S1: &S1{b: 'b'}}, "b", []int{1, 0}, 'b'},
1183         {S2{S1: &S1{S0: S0{c: 'c'}}}, "c", []int{1, 1, 2}, 'c'},
1184         {S2{}, "d", nil, 0},
1185         {S3{}, "S1", nil, 0},
1186         {S3{S2: S2{a: 'a'}}, "a", []int{1, 0}, 'a'},
1187         {S3{}, "b", nil, 0},
1188         {S3{d: 'd'}, "d", []int{2}, 0},
1189         {S3{e: 'e'}, "e", []int{3}, 'e'},
1190         {S4{a: 'a'}, "a", []int{1}, 'a'},
1191         {S4{}, "b", nil, 0},
1192 }
1193
1194 func TestFieldByIndex(t *testing.T) {
1195         for _, test := range fieldTests {
1196                 s := Typeof(test.s).(*StructType)
1197                 f := s.FieldByIndex(test.index)
1198                 if f.Name != "" {
1199                         if test.index != nil {
1200                                 if f.Name != test.name {
1201                                         t.Errorf("%s.%s found; want %s", s.Name(), f.Name, test.name)
1202                                 }
1203                         } else {
1204                                 t.Errorf("%s.%s found", s.Name(), f.Name)
1205                         }
1206                 } else if len(test.index) > 0 {
1207                         t.Errorf("%s.%s not found", s.Name(), test.name)
1208                 }
1209
1210                 if test.value != 0 {
1211                         v := NewValue(test.s).(*StructValue).FieldByIndex(test.index)
1212                         if v != nil {
1213                                 if x, ok := v.Interface().(int); ok {
1214                                         if x != test.value {
1215                                                 t.Errorf("%s%v is %d; want %d", s.Name(), test.index, x, test.value)
1216                                         }
1217                                 } else {
1218                                         t.Errorf("%s%v value not an int", s.Name(), test.index)
1219                                 }
1220                         } else {
1221                                 t.Errorf("%s%v value not found", s.Name(), test.index)
1222                         }
1223                 }
1224         }
1225 }
1226
1227 func TestFieldByName(t *testing.T) {
1228         for _, test := range fieldTests {
1229                 s := Typeof(test.s).(*StructType)
1230                 f, found := s.FieldByName(test.name)
1231                 if found {
1232                         if test.index != nil {
1233                                 // Verify field depth and index.
1234                                 if len(f.Index) != len(test.index) {
1235                                         t.Errorf("%s.%s depth %d; want %d", s.Name(), test.name, len(f.Index), len(test.index))
1236                                 } else {
1237                                         for i, x := range f.Index {
1238                                                 if x != test.index[i] {
1239                                                         t.Errorf("%s.%s.Index[%d] is %d; want %d", s.Name(), test.name, i, x, test.index[i])
1240                                                 }
1241                                         }
1242                                 }
1243                         } else {
1244                                 t.Errorf("%s.%s found", s.Name(), f.Name)
1245                         }
1246                 } else if len(test.index) > 0 {
1247                         t.Errorf("%s.%s not found", s.Name(), test.name)
1248                 }
1249
1250                 if test.value != 0 {
1251                         v := NewValue(test.s).(*StructValue).FieldByName(test.name)
1252                         if v != nil {
1253                                 if x, ok := v.Interface().(int); ok {
1254                                         if x != test.value {
1255                                                 t.Errorf("%s.%s is %d; want %d", s.Name(), test.name, x, test.value)
1256                                         }
1257                                 } else {
1258                                         t.Errorf("%s.%s value not an int", s.Name(), test.name)
1259                                 }
1260                         } else {
1261                                 t.Errorf("%s.%s value not found", s.Name(), test.name)
1262                         }
1263                 }
1264         }
1265 }
1266
1267 func TestImportPath(t *testing.T) {
1268         if path := Typeof(vector.Vector{}).PkgPath(); path != "libgo_container.vector" {
1269                 t.Errorf("Typeof(vector.Vector{}).PkgPath() = %q, want \"libgo_container.vector\"", path)
1270         }
1271 }
1272
1273 func TestDotDotDot(t *testing.T) {
1274         // Test example from FuncType.DotDotDot documentation.
1275         var f func(x int, y ...float)
1276         typ := Typeof(f).(*FuncType)
1277         if typ.NumIn() == 2 && typ.In(0) == Typeof(int(0)) {
1278                 sl, ok := typ.In(1).(*SliceType)
1279                 if ok {
1280                         if sl.Elem() == Typeof(float(0)) {
1281                                 // ok
1282                                 return
1283                         }
1284                 }
1285         }
1286
1287         // Failed
1288         t.Errorf("want NumIn() = 2, In(0) = int, In(1) = []float")
1289         s := fmt.Sprintf("have NumIn() = %d", typ.NumIn())
1290         for i := 0; i < typ.NumIn(); i++ {
1291                 s += fmt.Sprintf(", In(%d) = %s", i, typ.In(i))
1292         }
1293         t.Error(s)
1294 }
1295
1296 type inner struct {
1297         x int
1298 }
1299
1300 type outer struct {
1301         y int
1302         inner
1303 }
1304
1305 func (*inner) m() {}
1306 func (*outer) m() {}
1307
1308 func TestNestedMethods(t *testing.T) {
1309         typ := Typeof((*outer)(nil))
1310         if typ.NumMethod() != 1 || typ.Method(0).Func.Get() != NewValue((*outer).m).(*FuncValue).Get() {
1311                 t.Errorf("Wrong method table for outer: (m=%p)", (*outer).m)
1312                 for i := 0; i < typ.NumMethod(); i++ {
1313                         m := typ.Method(i)
1314                         t.Errorf("\t%d: %s %#x\n", i, m.Name, m.Func.Get())
1315                 }
1316         }
1317 }
1318
1319 type innerInt struct {
1320         x int
1321 }
1322
1323 type outerInt struct {
1324         y int
1325         innerInt
1326 }
1327
1328 func (i *innerInt) m() int {
1329         return i.x
1330 }
1331
1332 func TestEmbeddedMethods(t *testing.T) {
1333         typ := Typeof((*outerInt)(nil))
1334         if typ.NumMethod() != 1 || typ.Method(0).Func.Get() != NewValue((*outerInt).m).(*FuncValue).Get() {
1335                 t.Errorf("Wrong method table for outerInt: (m=%p)", (*outerInt).m)
1336                 for i := 0; i < typ.NumMethod(); i++ {
1337                         m := typ.Method(i)
1338                         t.Errorf("\t%d: %s %#x\n", i, m.Name, m.Func.Get())
1339                 }
1340         }
1341
1342         i := &innerInt{3}
1343         if v := NewValue(i).Method(0).Call(nil)[0].(*IntValue).Get(); v != 3 {
1344                 t.Errorf("i.m() = %d, want 3", v)
1345         }
1346
1347         o := &outerInt{1, innerInt{2}}
1348         if v := NewValue(o).Method(0).Call(nil)[0].(*IntValue).Get(); v != 2 {
1349                 t.Errorf("i.m() = %d, want 2", v)
1350         }
1351
1352         f := (*outerInt).m
1353         if v := f(o); v != 2 {
1354                 t.Errorf("f(o) = %d, want 2", v)
1355         }
1356 }