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/tests/test_proxy.py

@@ -5,11 +5,11 @@ import aiomqtt
 import logging
 
 from mock import patch, Mock
-from app.src.singleton import Singleton
-from app.src.proxy import Proxy
-from app.src.mqtt import Mqtt
-from app.src.gen3plus.solarman_v5 import SolarmanV5
-from app.src.config import Config
+from singleton import Singleton
+from proxy import Proxy
+from mqtt import Mqtt
+from gen3plus.solarman_v5 import SolarmanV5
+from config import Config
 
 
 pytest_plugins = ('pytest_asyncio',)