Fix a test that was leaving unattended tasks after the test

The request was cancelled fast enough, and the response writer was closed. But the response handler continued running and writing into that closed transport — long enough to be noticed by the cleanup fixture.

Signed-off-by: Sergey Vasilyev <[email protected]>

tests/apis/test_api_requests.py

@@ -236,7 +236,7 @@ async def serve_slowly():
 async def test_stopper_in_streams(
         resp_mocker, aresponses, hostname, method, delay, expected, settings, logger):
 
-    async def stream_slowly(request: aiohttp.ClientRequest):
+    async def stream_slowly(request: aiohttp.web.Request) -> aiohttp.web.StreamResponse:
         response = aiohttp.web.StreamResponse()
         await response.prepare(request)
         await asyncio.sleep(0.05)
@@ -256,3 +256,5 @@ async def stream_slowly(request: aiohttp.ClientRequest):
         items.append(item)
 
     assert items == expected
+
+    await asyncio.sleep(0.1)  # give the response some time to be cancelled and its tasks closed