In update-w3c-test-expectations, handle non-existent/non-test files.

third_party/WebKit/Tools/Scripts/webkitpy/w3c/test_parser_unittest.py

 # Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 #
 # 1. Redistributions of source code must retain the above
 #    copyright notice, this list of conditions and the following
 #    disclaimer.
 # 2. Redistributions in binary form must reproduce the above
@@ skipping 183 matching lines @@
 CONTENT OF TEST
 </body>
 </html>
 """
         # Set 'all' to False so this gets skipped.
         options = {'all': False}
 
         test_path = '/some/madeup/path/'
         parser = TestParser(test_path + 'somefile.html', MockHost(), options)
         test_info = parser.analyze_test(test_contents=test_html)
-
         self.assertEqual(test_info, None, 'test should have been skipped')
 
     def test_analyze_non_html_file(self):
         """ Tests analyze_test() with a file that has no html"""
         # FIXME: use a mock filesystem
         parser = TestParser(os.path.join(os.path.dirname(__file__), 'test_parser.py'), MockHost())
         test_info = parser.analyze_test()
         self.assertEqual(test_info, None, 'no tests should have been found in this file')
+
+    def test_parser_initialization_non_existent_file(self):
+        parser = TestParser('some/bogus/path.html', MockHost())
+        self.assertEqual(parser.filename, 'some/bogus/path.html')
+        self.assertIsNone(parser.test_doc)
+        self.assertIsNone(parser.ref_doc)