action for tests

.github/workflows/tests.yml

@@ -10,13 +10,14 @@ jobs:
       run:
         working-directory: .
     steps:
-      - uses: actions/checkout@v1
-      - uses: actions/setup-python@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v3
         with:
           python-version: '3.10'
       - name: Install requirements
         run: |
-          pip install -r requirements.txt
+          python -m pip install --upgrade pip
+          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
       #          pip install pytest-cover
       - name: Run tests and collect coverage
         run: |