[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

tests/test_middlewares/test_middleware_mixin.py

@@ -15,17 +15,20 @@
 async def async_get_response(request):
     return resp_for_get_response
 
+
 class ResponseMiddleware(AsyncMiddlewareMixin):
     async def process_request(self, request):
         return req
 
     async def process_response(self, request, response):
         return resp
 
+
 class RequestMiddleware(AsyncMiddlewareMixin):
     async def process_request(self, request):
         return resp
 
+
 class TestMiddlewareMixin:
     def test_repr(self):
         class GetResponse: