Added an action to run tests.

.github/workflows/run-tests.yaml

@@ -0,0 +1,29 @@
+name: Run unit tests
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [ '3.8', '3.9', '3.10', '3.11', '3.12' ]
+
+    name: Python ${{ matrix.python-version }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'pip'
+
+      # We do proper tests if we're on the master branch, or if we're creating a new release.
+      - name: Test with tox
+        run: |
+          pip install tox
+          tox