Add CI workflow for running unittests.

stack-info: PR: #74, branch: ZolotukhinM/stack/3

Author: ZolotukhinM

.github/workflows/check_tests.yml

@@ -0,0 +1,17 @@
+name: Check Tests
+on: [ pull_request ]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'  # Specify the Python version you want to use
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install pytest
+      - name: Run tests
+        run: pytest tests/