Prepare python code for reftests.

sky/tools/webkitpy/tool/commands/rebaseline_unittest.py

 # Copyright (C) 2010 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #    * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #    * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 245 matching lines @@
 
     def test_rebaseline_test_with_results_directory(self):
         self._write("userscripts/another-test.html", "test data")
         self._write(self.lion_expectations_path, "Bug(x) [ Mac ] userscripts/another-test.html [ ImageOnlyFailure ]\nbug(z) [ Linux ] userscripts/another-test.html [ ImageOnlyFailure ]\n")
         self.options.results_directory = '/tmp'
         self.command._rebaseline_test_and_update_expectations(self.options)
         self.assertItemsEqual(self.tool.web.urls_fetched, ['file:///tmp/userscripts/another-test-actual.txt'])
 
     def test_rebaseline_reftest(self):
         self._write("userscripts/another-test.html", "test data")
-        self._write("userscripts/another-test-expected.html", "generic result")
+        self._write("userscripts/another-test-expected.sky", "generic result")
         OutputCapture().assert_outputs(self, self.command._rebaseline_test_and_update_expectations, args=[self.options],
             expected_logs="Cannot rebaseline reftest: userscripts/another-test.html\n")
         self.assertDictEqual(self.command._scm_changes, {'add': [], 'remove-lines': [], "delete": []})
 
     def test_rebaseline_test_and_print_scm_changes(self):
         self.command._print_scm_changes = True
         self.command._scm_changes = {'add': [], 'delete': []}
         self.tool._scm.exists = lambda x: False
 
         self.command._rebaseline_test("WebKit Linux", "userscripts/another-test.html", "txt", None)
@@ skipping 981 matching lines @@
         oc.capture_output()
         self.command._do_one_rebaseline()
         out, _, _ = oc.restore_output()
 
         self.assertEqual(out, 'MOCK STDOUT\n')
         self.assertEqual(self.tool.executive.calls, [
             ['git', 'pull'],
             ['/mock-checkout/third_party/WebKit/tools/webkit-patch', 'auto-rebaseline', '--verbose'],
         ])
         self.assertEqual(self._logs, ['MOCK STDOUT'])