Add unit tests to GitHub workflows

.github/workflows/testing.yml

@@ -0,0 +1,31 @@
+# This workflow will install Python dependencies and run tests with a variety of Python versions
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
+
+name: Testing
+
+on:
+  push:
+    branches: [ "*" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: |
+          3.8
+          3.9
+          3.10
+          3.11
+          3.12
+          3.13
+    - name: Install dependencies
+      uses: ./.github/actions/prepare-tox
+    - name: Run unit tests
+      run: |
+        tox -e py38,py39,py310,py311,py312,py313