Add PRESUBMIT tests for _CheckUserActionUpdate function.

PRESUBMIT_test_mocks.py

 # Copyright 2014 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 json
 import os
 import re
 import subprocess
 import sys
 
@@ skipping 14 matching lines @@
     self.files = []
     self.is_committing = False
     self.change = MockChange([])
 
   def AffectedFiles(self, file_filter=None):
     return self.files
 
   def AffectedSourceFiles(self, file_filter=None):
     return self.files
 
+  def LocalPaths(self):
+    return self.files
+
   def PresubmitLocalPath(self):
     return os.path.dirname(__file__)
 
   def ReadFile(self, filename, mode='rU'):
     if hasattr(filename, 'AbsoluteLocalPath'):
        filename = filename.AbsoluteLocalPath()
     for file_ in self.files:
       if file_.LocalPath() == filename:
         return '\n'.join(file_.NewContents())
     # Otherwise, file is not in our mock API.
@@ skipping 10 matching lines @@
   class PresubmitResult(object):
     def __init__(self, message, items=None, long_text=''):
       self.message = message
       self.items = items
       self.long_text = long_text
 
     def __repr__(self):
       return self.message
 
   class PresubmitError(PresubmitResult):
-    def __init__(self, message, items, long_text=''):
+    def __init__(self, message, items=None, long_text=''):
       MockOutputApi.PresubmitResult.__init__(self, message, items, long_text)
       self.type = 'error'
 
   class PresubmitPromptWarning(PresubmitResult):
-    def __init__(self, message, items, long_text=''):
+    def __init__(self, message, items=None, long_text=''):
       MockOutputApi.PresubmitResult.__init__(self, message, items, long_text)
       self.type = 'warning'
 
   class PresubmitNotifyResult(PresubmitResult):
-    def __init__(self, message, items, long_text=''):
+    def __init__(self, message, items=None, long_text=''):
       MockOutputApi.PresubmitResult.__init__(self, message, items, long_text)
       self.type = 'notify'
 
   class PresubmitPromptOrNotify(PresubmitResult):
-    def __init__(self, message, items, long_text=''):
+    def __init__(self, message, items=None, long_text=''):
       MockOutputApi.PresubmitResult.__init__(self, message, items, long_text)
       self.type = 'promptOrNotify'
 
 
 class MockFile(object):
   """Mock class for the File class.
 
   This class can be used to form the mock list of changed files in
   MockInputApi for presubmit unittests.
   """
 
   def __init__(self, local_path, new_contents):
     self._local_path = local_path
     self._new_contents = new_contents
     self._changed_contents = [(i + 1, l) for i, l in enumerate(new_contents)]
 
   def ChangedContents(self):
     return self._changed_contents
 
   def NewContents(self):
     return self._new_contents
 
   def LocalPath(self):
     return self._local_path
 
+  def rfind(self, p):
+    """os.path.basename is called on MockFile so we need an rfind method."""
+    return self._local_path.rfind(p)
+
+  def __getitem__(self, i):
+    """os.path.basename is called on MockFile so we need a get method."""
+    return self._local_path[i]
+
 
 class MockAffectedFile(MockFile):
   def AbsoluteLocalPath(self):
     return self._local_path
 
 
 class MockChange(object):
   """Mock class for Change class.
 
   This class can be used in presubmit unittests to mock the query of the
   current change.
   """
 
   def __init__(self, changed_files):
     self._changed_files = changed_files
 
   def LocalPaths(self):
     return self._changed_files