How to use the daphne.testing.TestApplication.delete_result function in daphne

def tearDown(self):
        """
        Ensures any storage files are cleared.
        """
        TestApplication.delete_setup()
        TestApplication.delete_result()

def __enter__(self):
        # Clear result storage
        TestApplication.delete_setup()
        TestApplication.delete_result()
        # Option Daphne features
        kwargs = {}
        # Optionally enable X-Forwarded-For support.
        if self.xff:
            kwargs["proxy_forwarded_address_header"] = "X-Forwarded-For"
            kwargs["proxy_forwarded_port_header"] = "X-Forwarded-Port"
            kwargs["proxy_forwarded_proto_header"] = "X-Forwarded-Proto"
        if self.http_timeout:
            kwargs["http_timeout"] = self.http_timeout
        # Start up process
        self.process = DaphneProcess(
            host=self.host,
            application=TestApplication,
            kwargs=kwargs,
            setup=self.process_setup,
            teardown=self.process_teardown,