Add presubmit check to prevent package boundary violations.

tools-webrtc/check_package_boundaries_test.py

Index: tools-webrtc/check_package_boundaries_test.py
diff --git a/tools-webrtc/check_package_boundaries_test.py b/tools-webrtc/check_package_boundaries_test.py
new file mode 100644
index 0000000000000000000000000000000000000000..13c6232c24783759894e58b3f6e6720f884ea3cf
--- /dev/null
+++ b/tools-webrtc/check_package_boundaries_test.py
@@ -0,0 +1,54 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+import logging
+import os
+import subprocess
+import sys
+
+
+def _RunCommand(command, cwd):
+  """Runs a command and returns the output from that command."""
+  p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
+                       cwd=cwd)
+  stdout = p.stdout.read()
+  stderr = p.stderr.read()
+  p.wait()
+  p.stdout.close()
+  p.stderr.close()
+  return p.returncode, stdout, stderr
+

[kjellander_webrtc, 2017/01/19 10:51:26]

+1 blank line

+def _CheckEqual(actual, expected, message=''):

[kjellander_webrtc, 2017/01/19 10:51:26]

Please use unittest module instead.

[ehmaldonado_webrtc, 2017/01/19 13:33:56]

Done.

+  message += '\n\n  ACTUAL:\n{}\n  EXPECTED:\n{}\n'.format(actual, expected)
+  if actual != expected:
+    logging.error(message)
+    sys.exit(1)
+
+def main():
+  logging.basicConfig(format='ERROR:check_package_boundaries.py %(message)s')
+  os.chdir(os.path.dirname(os.path.abspath(__file__)))
+
+  with open(os.path.join('testdata', 'expected_stderr')) as f:
+    expected_stderr = f.read()
+
+  with open(os.path.join('testdata', 'expected_stdout')) as f:
+    expected_stdout = f.read()
+
+  test_command = ['python', 'check_package_boundaries.py', 'testdata']
+  return_code, stdout, stderr = _RunCommand(test_command, cwd=os.getcwd())
+
+  _CheckEqual(return_code, 1, 'Unexpected return code.')
+  _CheckEqual(stdout, expected_stdout, 'Unexpected output (stdout).')
+  _CheckEqual(stderr, expected_stderr, 'Unexpected output (stderr).')
+
+  return 0
+
+if __name__ == '__main__':
+  sys.exit(main())