Add python wrapper for test.dart.

tools/test_wrapper.py

+#!/usr/bin/env python
+# Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+import os
+import platform
+import string
+import subprocess
+import sys
+
+# Try to guess the host operating system.
+def GuessOS():

[ahe, 2012/01/04 15:38:40]

Any reason for not importing this from utils.py?

[Mads Ager (google), 2012/01/05 14:15:45]

I had two reasons:

1. I want to return 'windows' and not 'win32'.
2. I would like to get rid of as much python code as possible.

None of these are critical. I can just test for win32 explicitly and I actually
think it will be a while before we can get rid of utils.py in any case. Let's
just import utils for now.

[ahe, 2012/01/05 14:19:52]

Thank you!

+  id = platform.system()
+  if id == "Linux":
+    return "linux"
+  elif id == "Darwin":
+    return "macos"
+  elif id == "Windows" or id == "Microsoft":
+    # On Windows Vista platform.system() can return "Microsoft" with some
+    # versions of Python, see http://bugs.python.org/issue1082 for details.
+    return "windows"
+  else:
+    return None
+
+def Main():
+  args = string.join(sys.argv[1:])
+  tools_dir = os.path.dirname(os.path.realpath(__file__))
+  dart_binary = string.join([tools_dir, 'testing', 'bin', GuessOS(), 'dart'],

[ahe, 2012/01/04 15:38:40]

os.path.join(tools_dir, 'testing', 'bin', GuessOS(), 'dart')

[Mads Ager (google), 2012/01/05 14:15:45]

Thanks! Done.

+                            os.sep)
+  if GuessOS() == "windows":
+    dart_binary = dart_binary + ".exe"
+  dart_test_script = string.join([tools_dir, 'test.dart'], os.sep)
+  command = "%s %s %s" % (dart_binary, dart_test_script, args)

[ahe, 2012/01/04 15:38:40]

command = [dart_binary, dart_test_script] + args

[Mads Ager (google), 2012/01/05 14:15:45]

Done.

+  return subprocess.call(command, shell=True)
+
+if __name__ == '__main__':
+  sys.exit(Main())