Add GitHub Actions CI for tests

Author: theolujay

.github/workflows/tests.yml

@@ -0,0 +1,41 @@
+name: Tests
+
+on:
+    push:
+        branches: [ "main" ]
+    pull_request:
+        branches: [ "main" ]
+
+jobs:
+    test:
+        runs-on: ubuntu-latest
+
+        strategy:
+            matrix:
+                python-version: ["3.9", "3.10", "3.11", "3.12"]
+            
+        steps:
+            - name: Checkout repository
+              uses: actions/checkout@v4
+            
+            - name: Set up Python ${{ matrix.python-version }}
+              uses: actions/setup-python@v5
+              with:
+                python-version: ${{ matrix.python-version }}
+            
+            - name: Install dependencies
+              run: |
+                python -m pip install --upgrade pip
+                pip install uv
+                uv pip install -e ".[dev]"
+                uv pip install pytest pytest-cov
+
+            - name: Run tests
+              run: |
+                uv run pytest --cov --cov-branch --cov-report=xml
+            
+            - name: Upload coverage to Codecov
+              uses: codecov/codecov-action@v5
+              with:
+                files: ./coverage.xml
+                fail_ci_if_error: true