TESTS TESTS ADDED MORE TEST TESTED GRESOURCES TESTS TESTS I LOVE TESTS SO MUCH

- Fully covered gresource orchestrator and it helpers with tests
- Use abstract command runner INSTEAD OF SUBPROCESS in gresources
- Replaced some subprocesses by builtin functions

.github/workflows/python-app.yml

@@ -38,4 +38,4 @@ jobs:
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Test with pytest
       run: |
-        pytest tests/*.py tests/*/*.py
+        pytest tests/