ci: fix pytest step

.github/workflows/python-app.yml

@@ -38,5 +38,5 @@ jobs:
       continue-on-error: true
     - name: Test with pytest
       run: |
-        pip install pytest pytest-cov
-        pytest tests.py --doctest-modules --junitxml=junit/test-results.xml --cov=com --cov-report=xml --cov-report=html
+        pip install pytest
+        pytest