suppress messages for PresubmitAddText results

tests/presubmit_unittest.py

 #!/usr/bin/python
 # Copyright (c) 2010 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.
 
 """Unit tests for presubmit_support.py and presubmit_canned_checks.py."""
 
 # pylint is too confused.
 # pylint: disable=E1101,E1103,W0212,W0403
 
@@ skipping 1027 matching lines @@
     members = [
       'MailTextResult', 'PresubmitAddText', 'PresubmitError',
       'PresubmitNotifyResult', 'PresubmitPromptWarning', 'PresubmitResult',
     ]
     # If this test fails, you should add the relevant test.
     self.compareMembers(presubmit.OutputApi(), members)
 
   def testOutputApiBasics(self):
     self.mox.ReplayAll()
     self.failUnless(presubmit.OutputApi.PresubmitError('').IsFatal())
+    self.failUnless(presubmit.OutputApi.PresubmitError('').IsMessage())
     self.failIf(presubmit.OutputApi.PresubmitError('').ShouldPrompt())
 
     self.failIf(presubmit.OutputApi.PresubmitPromptWarning('').IsFatal())
     self.failUnless(
         presubmit.OutputApi.PresubmitPromptWarning('').ShouldPrompt())
+    self.failUnless(
+        presubmit.OutputApi.PresubmitPromptWarning('').IsMessage())
 
     self.failIf(presubmit.OutputApi.PresubmitNotifyResult('').IsFatal())
     self.failIf(presubmit.OutputApi.PresubmitNotifyResult('').ShouldPrompt())
+    self.failUnless(
+        presubmit.OutputApi.PresubmitNotifyResult('foo').IsMessage())
 
     self.failIf(presubmit.OutputApi.PresubmitAddText('foo').IsFatal())
     self.failIf(presubmit.OutputApi.PresubmitAddText('foo').ShouldPrompt())
+    self.failIf(presubmit.OutputApi.PresubmitAddText('foo').IsMessage())
 
     # TODO(joi) Test MailTextResult once implemented.
 
   def testOutputApiHandling(self):
     self.mox.ReplayAll()
 
     output = StringIO.StringIO()
     unused_input = StringIO.StringIO()
     added_text = presubmit.OutputApi.PresubmitAddText('R=ben@example.com')
     self.failUnless(added_text._Handle(output, unused_input))
@@ skipping 832 matching lines @@
   def testCannedCheckOwners_CommittingWithLGTMs(self):
     self.OwnersTest(is_committing=True,
         approvers=set('ben@example.com'),
         uncovered_files=set(),
         expected_results=[])
 
 
 if __name__ == '__main__':
   import unittest
   unittest.main()