event_loop for pytest-asyncio (see pytest-dev/pytest-asyncio#68)

Author: alwx

tests/core/conftest.py

@@ -84,6 +84,13 @@ def __init__(
         super(MongoTrackerStore, self).__init__(_domain, None)
 
 
+@pytest.yield_fixture(scope='session')
+def event_loop(request):
+    loop = asyncio.get_event_loop_policy().new_event_loop()
+    yield loop
+    loop.close()
+
+
 @pytest.fixture(scope="session")
 def loop():
     loop = asyncio.new_event_loop()