add automated unit testing

Author: lpm0073

.github/workflows/tests.yml

@@ -10,9 +10,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout
+        uses: actions/checkout@v3.5.2
       - name: Set up Python 3.x
-        uses: actions/setup-python
+        uses: actions/setup-python@v4
         with:
           python-version: "3.10"
       - run: python -m pip install -r requirements/local.txt