Adds the ability to run pure Go unit tests in the Mojo test suite.

mojo/tools/run_pure_go_tests.py

+#!/usr/bin/env python
+# Copyright (c) 2015 The Chromium Authors. All rights reserved.

[viettrungluu, 2015/10/05 23:16:59]

The current copyright does not have the "(c)".

[rudominer, 2015/10/06 00:29:10]

Done.

+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import argparse
+import os
+import subprocess
+import sys
+
+from mopy.paths import Paths
+
+
+def main():
+  parser = argparse.ArgumentParser(description="Runs pure Go tests in the "
+      "Mojo source tree from a hard-coded list of directories.")
+  parser.add_argument('go_tool_path', metavar='go-tool-path',
+      help="the path to the 'go' binary")
+  args = parser.parse_args()
+  go_tool = args.go_tool_path
+  env = os.environ.copy()
+  env['GOROOT'] = os.path.dirname(os.path.dirname(go_tool))
+
+  saved_cwd = os.getcwd()

[viettrungluu, 2015/10/05 23:16:59]

Why do you bother doing this?

[rudominer, 2015/10/06 00:29:10]

Good point. Removed.

+  # TODO(rudominer) Uncomment the line below when we are able to make use of
+  # the src_root variable.
+  # src_root = Paths().src_root
+
+  test_dir_list = [
+      # TODO(rudominer) Add paths to go directories with tests.

[viettrungluu, 2015/10/05 23:16:59]

It seems like a bad idea to hard-code stuff in a script.

[rudominer, 2015/10/06 00:29:10]

OK. What do you think about the following strategy: Add the new file
mojo/tools/data/go_unittests and put the list in there using a format similar to
the formats of the other files in that directory?

[viettrungluu, 2015/10/06 01:46:30]

SGTM

+      # NOTE(rudominer) The paths should all be made absolute by including
+      # src_root as the first path component.
+      #os.path.join(src_root, 'mojom', 'mojom_parser', 'lexer'),
+  ]
+
+  for test_dir in test_dir_list:
+    os.chdir(test_dir)
+    print "Running Go tests in %s..." % test_dir
+    call_result = subprocess.call([go_tool, "test"], env=env)
+    if call_result:
+      os.chdir(saved_cwd )
+      return call_result
+
+  os.chdir(saved_cwd)
+
+if __name__ == '__main__':
+  sys.exit(main())