Fix a minor test bug in test-webkitpy

Tools/Scripts/webkitpy/test/main_unittest.py

 # Copyright (C) 2012 Google, Inc.
 #
 # 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 copyright
 #     notice, this list of conditions and the following disclaimer in the
 #     documentation and/or other materials provided with the distribution.
@@ skipping 45 matching lines @@
 
         # Here we need to remove any existing log handlers so that they
         # don't log the messages webkitpy.test while we're testing it.
         root_logger = logging.getLogger()
         root_handlers = root_logger.handlers
         root_logger.handlers = []
 
         tester.printer.stream = errors
         tester.finder.find_names = lambda args, run_all: []
         oc = OutputCapture()
+        orig_argv = sys.argv[:]
         try:
+            sys.argv = sys.argv[0:1]
             oc.capture_output()
             self.assertFalse(tester.run())
         finally:
             _, _, logs = oc.restore_output()
             root_logger.handlers = root_handlers
+            sys.argv = orig_argv
 
         self.assertIn('No tests to run', errors.getvalue())
         self.assertIn('No tests to run', logs)
 
     def _find_test_names(self, args):
         tester = Tester()
         tester._options, args = tester._parse_args(args)
         return tester._test_names(_Loader(), args)
 
     def test_individual_names_are_not_run_twice(self):
@@ skipping 26 matching lines @@
         filesystem = FileSystem()
         executive = Executive()
         module_path = filesystem.path_to_module(self.__module__)
         script_dir = module_path[0:module_path.find('webkitpy') - 1]
         proc = executive.popen([sys.executable, filesystem.join(script_dir, 'test-webkitpy'), '-c', STUBS_CLASS + '.test_empty'],
                                stdout=executive.PIPE, stderr=executive.PIPE)
         out, _ = proc.communicate()
         retcode = proc.returncode
         self.assertEqual(retcode, 0)
         self.assertIn('Cover', out)