Proper cleanup after tests

test/conftest.py

@@ -1,3 +1,4 @@
+import asyncio
 import sys
 from pathlib import Path
 from unittest.mock import Mock
@@ -23,8 +24,17 @@ def bot(mocker: MockerFixture):
 def mbot(bot):
   mbot_mock = Music(bot)
   yield mbot_mock
+  mbot_mock.cog_unload()
 
 
 @pytest.fixture
 def ctx(mocker: MockerFixture):
   yield mocker.patch('discord.ext.commands.Context', autospec=True)
+
+
+@pytest.fixture
+def event_loop():
+  loop = asyncio.get_event_loop()
+  yield loop
+  pending = asyncio.all_tasks(loop=loop)
+  asyncio.ensure_future(asyncio.gather(*pending))