Adding pytest-qt package

Author: jmwright

.github/workflows/tests.yml

@@ -18,6 +18,6 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install .[dev]
-          python -m pip install pytest-xvfb
+          python -m pip install pytest-xvfb pytest-qt
       - name: Run tests
         run: python -m pytest -v