async def METHOD_NAME(self):
    mock_http_client = Mock()
    mock_http_client.request.return_value = Response(200, "doesnt matter")
    mock_http_client.is_async = False
    client = Client("username", "password", http_client=mock_http_client)
    with self.assertRaises(RuntimeError):
        await client.request_async("doesnt matter", "doesnt matter")