run tests with 'test' dependency group

.github/workflows/ci.yaml

@@ -22,7 +22,7 @@ jobs:
           sudo apt update
           sudo apt-get install -y libxml2-dev libxmlsec1-dev
           python -m pip install --upgrade pip
-          pip install .
+          pip install .[test]
 
       - name: Run tests
         run: |