Speed up CI with uv and parallel test execution

Switch from pip to uv for faster installs and add pytest-xdist
to run tests in parallel with -n auto.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: danielkiv

.github/workflows/tests.yml

@@ -20,14 +20,13 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-          cache: 'pip' # Caches dependencies to speed up subsequent runs
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
 
       - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install -e ".[dev,full]"
+        run: uv pip install --system -e ".[dev,full]"
 
       - name: Run tests
         run: |
-          # The -v flag gives verbose output so you can see exactly which test failed
-          python -m pytest -v
+          python -m pytest -v -n auto

pyproject.toml

@@ -66,6 +66,7 @@ full = [
 dev = [
   "pytest>=7.4",
   "pytest-cov>=4.1",
+  "pytest-xdist>=3.0",
   "ruff>=0.5.0",
 ]