ci: Add tests to GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,24 @@
+name: Test and coverage
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 2
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+      - name: Install dependencies
+        run: pip install -r requirements.txt  -r requirements.dev.txt
+      - name: Run tests and collect coverage
+        run: |
+          pytest --cov=src tests
+          coverage xml
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v2
+