Make assertions for ABC classes

Author: asvetlov

aiohttp/web.py

@@ -972,6 +972,8 @@ def handle_request(self, message, payload):
         try:
             match_info = yield from self._app.router.resolve(request)
 
+            assert isinstance(match_info, AbstractMatchInfo), match_info
+
             request._match_info = match_info
             handler = match_info.handler
 
@@ -1002,6 +1004,7 @@ def __init__(self, *, loop=None, router=None, **kwargs):
         self._kwargs = kwargs
         if router is None:
             router = UrlDispatcher()
+        assert isinstance(router, AbstractRouter), router
         self._router = router
         self._loop = loop
         self._finish_callbacks = []