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_singleton.py

@@ -1,16 +1,16 @@
 # test_with_pytest.py
 import pytest
-from app.src.singleton import Singleton
+from singleton import Singleton
 
-class Test(metaclass=Singleton):
+class Example(metaclass=Singleton):
     def __init__(self):
         pass  # is a dummy test class
 
 def test_singleton_metaclass():
     Singleton._instances.clear()
-    a = Test()
+    a = Example()
     assert 1 == len(Singleton._instances)
-    b = Test()
+    b = Example()
     assert 1 == len(Singleton._instances)
     assert a is  b
     del a