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 2015 The Chromium Authors. All rights reserved.
+# 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))

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

Maybe it should take the Go root as an argument instead (and infer the location
of go)?

Though I wonder if we shouldn't be invoking go via mojo/go/go.py (which may
itself require updating) instead.

[viettrungluu, 2015/10/06 21:08:06]

You didn't say anything about this.

[rudominer, 2015/10/09 18:30:30]

I'm sorry I missed this comment. I took your second suggestion and am now using
go.py to invoke the go tool.

+
+  # 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.
+      # NOTE(rudominer) The paths should all be made absolute by including

[ppi, 2015/10/06 17:57:47]

This will be better enforced by assert on os.path.isabs() later in the loop. I'd
check this just before os.chdir, where it will be clear why we need the path to
be absolute.

[rudominer, 2015/10/06 20:28:54]

This is now organized differently.

+      # 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 )

[ppi, 2015/10/06 17:57:46]

Need to drop this line too.

[rudominer, 2015/10/06 20:28:54]

Thanks. Done.

+      return call_result
+
+if __name__ == '__main__':
+  sys.exit(main())