tests: Fix warnings

tests/test_aiohttp.py

@@ -22,7 +22,7 @@ class _TestAioHTTP:
             return aiohttp.web.Response(text=PAYLOAD)
 
         asyncio.set_event_loop(self.loop)
-        app = aiohttp.web.Application(loop=self.loop)
+        app = aiohttp.web.Application()
         app.router.add_get('/', on_request)
 
         f = self.loop.create_server(
@@ -33,6 +33,9 @@ class _TestAioHTTP:
         port = srv.sockets[0].getsockname()[1]
 
         async def test():
+            # Make sure we're using the correct event loop.
+            self.assertIs(asyncio.get_event_loop(), self.loop)
+
             for addr in (('localhost', port),
                          ('127.0.0.1', port)):
                 async with aiohttp.ClientSession() as client:

tests/test_tcp.py

@@ -823,7 +823,7 @@ class Test_UV_TCP(_TestTCP, tb.UVTestCase):
                 super().data_received(data)
                 self.transport.write(expected_response)
 
-        lsock = socket.socket()
+        lsock = socket.socket(socket.AF_INET)
         lsock.bind(('127.0.0.1', 0))
         lsock.listen(1)
         addr = lsock.getsockname()
@@ -835,7 +835,7 @@ class Test_UV_TCP(_TestTCP, tb.UVTestCase):
         def client():
             nonlocal response
             try:
-                csock = socket.socket()
+                csock = socket.socket(socket.AF_INET)
                 if client_ssl is not None:
                     csock = client_ssl.wrap_socket(csock)
                 csock.connect(addr)

tests/test_udp.py

@@ -114,6 +114,9 @@ class _TestUDP:
         finally:
             if s_transport:
                 s_transport.close()
+                # let it close
+                self.loop.run_until_complete(
+                    asyncio.sleep(0.1, loop=self.loop))
 
     def test_create_datagram_endpoint_sock(self):
         sock = None