Update python-app.yml

.github/workflows/python-app.yml

@@ -30,9 +30,9 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install flake8 pytest Flask requests
+          pip install flake8 pytest pytest-flask Flask requests
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
       - name: Start app
         run: |
-           python pony.py
+           pytest pony.py