rename TestPlugin to so it is ignored by pytest

pyproject.toml

@@ -49,7 +49,7 @@ hbmqtt_sub = 'hbmqtt.scripts.sub_script:main'
 [tool.poetry.plugins]
 
 [tool.poetry.plugins."hbmqtt.test.plugins"]
-"test_plugin" = "tests.plugins.test_manager:TestPlugin"
+"test_plugin" = "tests.plugins.test_manager:EmptyTestPlugin"
 "event_plugin" = "tests.plugins.test_manager:EventTestPlugin"
 "packet_logger_plugin" = "hbmqtt.plugins.logging:PacketLoggerPlugin"
 

tests/plugins/test_manager.py

@@ -5,8 +5,6 @@ import unittest
 import logging
 import asyncio
 
-import pytest
-
 from hbmqtt.plugins.manager import PluginManager
 
 formatter = (