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

def get_received(self):
        """
        Returns the scope and messages the test application has received
        so far. Note you'll get all messages since scope start, not just any
        new ones since the last call.

        Also checks for any exceptions in the application. If there are,
        raises them.
        """
        try:
            inner_result = TestApplication.load_result()
        except FileNotFoundError:
            raise ValueError("No results available yet.")
        # Check for exception
        if "exception" in inner_result:
            raise inner_result["exception"]
        return inner_result["scope"], inner_result["messages"]