Add alltests script to run all tests at once

diff --git a/tests/alltests b/tests/alltests
new file mode 100755 (executable)
index 0000000..77569c5
--- /dev/null
+++ b/tests/alltests
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# fail immediately if any subsequent command fails
+set -e
+
+BASEDIR=$(dirname $0)
+cd $BASEDIR
+
+./modify1
+./modify2
+./modify3
+./modify4
+./modify5