ci: Add GitHub Action to automatically run unit tests

Author: holtskinner

.github/workflows/unit-tests.yml

@@ -0,0 +1,53 @@
+name: Run Unit Tests
+
+on:
+  pull_request:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Test with Python ${{ matrix.python-version }}
+
+    runs-on: ubuntu-latest
+
+    if: github.repository == 'google/a2a-python'
+
+    strategy:
+      matrix:
+        python-version: ['3.13']
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: uv
+          cache-dependency-path: uv.lock
+
+      - name: Install uv
+        run: |
+          curl -LsSf https://astral.sh/uv/install.sh | sh
+
+      - name: Add uv to PATH
+        run: |
+          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+
+      - name: Install dependencies
+        run: uv sync --dev
+
+      - name: Run tests
+        run: pytest
+
+      - name: Upload coverage report
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-report-${{ matrix.python-version }}
+          path: coverage.xml
+          if-no-files-found: ignore