Add unit test workflow

.github/workflows/unittests.yaml

@@ -0,0 +1,44 @@
+name: Unit Tests
+
+on:
+  push:
+    branches:
+      - master
+      - feature/refactor
+  pull_request: {}
+
+jobs:
+  test:
+    name: Unit Tests
+    runs-on: ubuntu-22.04
+
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7, 3.8, 3.9, 3.10, 3.11]
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+        cache: pip
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install pytest
+        pip install -r requirements.txt
+
+    - name: pytest
+      run: |
+        pytest --junitxml=pytest.xml --cov-report=term-missing:skip-covered --cov=semver | tee pytest-coverage.txt
+
+    - name: Comment Result Summary
+      uses: MishaKav/pytest-coverage-comment@main
+      with:
+        pytest-coverage-path: ./pytest-coverage.txt
+        junitxml-path: ./pytest.xml
+      if: github.event_name == 'pull_request'