PRESUBMIT: Enforce tracker prefix for all BUG entries

PRESUBMIT_test.py

+import unittest
+
+import PRESUBMIT
+from PRESUBMIT_test_mocks import MockInputApi, MockOutputApi
+
+
+class CheckBugEntryField(unittest.TestCase):
+  def testCommitMessageBugEntryWithNoError(self):
+    mock_input_api = MockInputApi()
+    mock_output_api = MockOutputApi()
+    mock_input_api.change.BUG = 'webrtc:1234'
+    errors = PRESUBMIT._CheckCommitMessageBugEntry(mock_input_api,
+                                                   mock_output_api)
+    self.assertEqual(0, len(errors))
+
+  def testCommitMessageBugEntryReturnError(self):
+    mock_input_api = MockInputApi()
+    mock_output_api = MockOutputApi()
+    mock_input_api.change.BUG = 'webrtc:1234,webrtc=4321'
+    errors = PRESUBMIT._CheckCommitMessageBugEntry(mock_input_api,
+                                                   mock_output_api)
+    self.assertEqual(1, len(errors))
+    self.assertEqual(('Bogus BUG entry: webrtc=4321. Please specify'
+                      ' the issue tracker prefix and the issue number,'
+                      ' separated by a colon, e.g. webrtc:123 or'
+                      ' chromium:12345.'), str(errors[0]))
+
+  def testCommitMessageButEntryReturnErrorWhenBugIsNone(self):
+    mock_input_api = MockInputApi()
+    mock_output_api = MockOutputApi()
+    mock_input_api.change.BUG = None
+    errors = PRESUBMIT._CheckCommitMessageBugEntry(mock_input_api,
+                                                   mock_output_api)
+    self.assertEqual(1, len(errors))

[kjellander_webrtc, 2017/09/07 08:28:15]

This should not be an error. we want to accept None as a value. So the code
needs to be updated.

[charujain, 2017/09/08 09:57:04]

I think the code already handles this. The test was wrong since i was not
checking for String 'None'. 

Fixed it now.

+    self.assertEqual(('Bogus BUG entry: . Please specify'
+                      ' the issue tracker prefix and the issue number,'
+                      ' separated by a colon, e.g. webrtc:123 or'
+                      ' chromium:12345.'), str(errors[0]))
+
+
+if __name__ == '__main__':
+    unittest.main()
+