Install pytest.

.github/workflows/build.yaml

@@ -25,15 +25,17 @@ jobs:
 
       - name: Install dependencies
         run: |
-          pip install -r requirements.txt
+          pip install uv
+          uv pip install --system -r requirements.txt
+          uv pip install --system pytest pytest-xdist pytest-cov
 
       - name: Build and install
         run: |
-          python -m pip install --no-deps -v -e .
+          uv pip install --system --no-deps -v -e .
 
       - name: Run tests
         run: |
-          pytest -r a -v -n 3 --open-files --cov=tests --cov-report=xml --cov-report=term --cov-branch
+          pytest -r a -v -n 3 --cov=tests --cov-report=xml --cov-report=term --cov-branch
 
       - name: Upload coverage to codecov
         uses: codecov/codecov-action@v2