fix failed test

Author: wwwjfy

tests/test_sanic.py

@@ -1,3 +1,5 @@
+import asyncio
+
 from async_generator import yield_, async_generator
 import pytest
 import sanic
@@ -11,6 +13,11 @@
 _MAX_INACTIVE_CONNECTION_LIFETIME = 59.0
 
 
+def teardown_module():
+    # sanic server will close the loop during shutdown
+    asyncio.set_event_loop(asyncio.new_event_loop())
+
+
 # noinspection PyShadowingNames
 async def _app(config):
     app = sanic.Sanic()