again test-implementation

.github/workflows/pytest.yml

+name: Run pytest
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.9]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install flake8 pytest
+          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+#      - name: Lint with flake8
+#        run: |
+#          # stop the build if there are Python syntax errors or undefined names
+#          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+#          # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+#          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+      - name: Test with pytest
+        run: |
+          pytest