S allius/pytest (#211)

* - fix pytest setup that can be startet from the rootdir
  - support python venv environment
  - add pytest.ini
  - move common settings from .vscode/settings.json into pytest.ini
  - add missing requirements
  - fix import paths for pytests

* - support python venv environment

* initial version

* - add missing requirements python-dotenv

* fix import paths for pytests

* fix pytest warnings

* initial version

* report 5 slowest test durations

* add more vscode settings for python

app/src/mqtt.py

@@ -2,16 +2,11 @@ import asyncio
 import logging
 import aiomqtt
 import traceback
-if __name__ == "app.src.mqtt":
-    from app.src.modbus import Modbus
-    from app.src.messages import Message
-    from app.src.config import Config
-    from app.src.singleton import Singleton
-else:  # pragma: no cover
-    from modbus import Modbus
-    from messages import Message
-    from config import Config
-    from singleton import Singleton
+
+from modbus import Modbus
+from messages import Message
+from config import Config
+from singleton import Singleton
 
 logger_mqtt = logging.getLogger('mqtt')