def __init__(self):
        super(MockTestResultsFetcher, self).__init__()
        self._canned_results = {}
        self._canned_retry_summary_json = {}
        self._webdriver_results = {}
        self.fetched_builds = []
        self.fetched_webdriver_builds = []
        self._layout_test_step_name = 'blink_web_tests (with patch)'