[ios] Add a PRESUBMIT check for TODO.

All TODOs in src/ios/ should follow the format TODO(crbug.com/######)
so add a PRESUBMIT.py check (and corresponding unit tests) for that.

BUG=677203

Change-Id: I360ad75c786f292d3a8ada8df519cb451c1c2828
Reviewed-on: https://chromium-review.googlesource.com/538613
Commit-Queue: Sylvain Defresne <[email protected]>
Reviewed-by: Eugene But <[email protected]>
Cr-Commit-Position: refs/heads/master@{#482589}
diff --git a/ios/PRESUBMIT_test.py b/ios/PRESUBMIT_test.py
new file mode 100644
index 0000000..e50ff3d
--- /dev/null
+++ b/ios/PRESUBMIT_test.py
@@ -0,0 +1,41 @@
+# Copyright 2017 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 os
+import sys
+import unittest
+
+import PRESUBMIT
+
+sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+import PRESUBMIT_test_mocks
+
+
+class CheckTODOFormatTest(unittest.TestCase):
+  """Test the _CheckBugInToDo presubmit check."""
+
+  def testTODOs(self):
+    bad_lines = ['TO''DO(ldap): fix this',
+                 'TO''DO(ladp): see crbug.com/8675309',
+                 'TO''DO(8675309): fix this',
+                 'TO''DO(http://crbug.com/8675309): fix this',
+                 'TO''DO( crbug.com/8675309): fix this',
+                 'TO''DO(crbug/8675309): fix this',
+                 'TO''DO(crbug.com): fix this']
+    good_lines = ['TO''DO(crbug.com/8675309): fix this',
+                  'TO''DO(crbug.com/8675309): fix this (please)']
+    mock_input = PRESUBMIT_test_mocks.MockInputApi()
+    mock_input.files = [PRESUBMIT_test_mocks.MockFile(
+        'ios/path/foo_controller.mm', bad_lines + good_lines)]
+    mock_output = PRESUBMIT_test_mocks.MockOutputApi()
+    errors = PRESUBMIT._CheckBugInToDo(mock_input, mock_output)
+    self.assertEqual(len(errors), 1)
+    self.assertEqual('error', errors[0].type)
+    self.assertTrue('without bug numbers' in errors[0].message)
+    error_lines = errors[0].message.split('\n')
+    self.assertEqual(len(error_lines), len(bad_lines) + 2)
+
+
+if __name__ == '__main__':
+  unittest.main()