rebaseline_server: serve JSON from static file, rather than generating it live

gm/rebaseline_server/results_test.py

 #!/usr/bin/python
 
 """
 Copyright 2013 Google Inc.
 
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 
 Test results.py
 
@@ skipping 16 matching lines @@
 import gm_json  # must import results first, so that gm_json will be in sys.path
 
 
 class ResultsTest(base_unittest.TestCase):
 
   def test_gm(self):
     """Process results of a GM run with the Results object."""
     results_obj = results.Results(
         actuals_root=os.path.join(self._input_dir, 'gm-actuals'),
         expected_root=os.path.join(self._input_dir, 'gm-expectations'),
-        generated_images_root=self._temp_dir)
+        generated_images_root=self._temp_dir,
+        diff_base_url='/static/generated-images')
     results_obj.get_timestamp = mock_get_timestamp
     gm_json.WriteToFile(
         results_obj.get_packaged_results_of_type(
             results.KEY__HEADER__RESULTS_ALL),
         os.path.join(self._output_dir_actual, 'gm.json'))
 
 
 def mock_get_timestamp():
   """Mock version of Results.get_timestamp() for testing."""
   return 12345678
 
 
 def main():
   base_unittest.main(ResultsTest)
 
 
 if __name__ == '__main__':
   main()