Add PyTest workflow for automated testing on multiple Python versions

.github/workflows/pytest.yml

@@ -0,0 +1,32 @@
+
+name: PyTest
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.10', '3.11', '3.12']
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install setuptools chardet pathspec pytest
+
+      - name: Run tests
+        run: |
+          pytest -v tests/test_codemapper.py