Add test for the main error handler

.github/workflows/pytest_cov.yml

@@ -26,12 +26,13 @@ jobs:
           pip install --upgrade pip
           pip install -r requirements.txt
           pip install PyVirtualDisplay
+          pip install pytest-timeout
           pip install pytest-cov
           pip install pytest-xvfb
           pip install pytest-qt
           pip install codecov
       - name: Run Tests
-        run: xvfb-run pytest -v --cov=nw
+        run: xvfb-run pytest -v --cov=nw --timeout=90
       - name: Upload to Codecov
         uses: codecov/codecov-action@v1
 
@@ -58,7 +59,8 @@ jobs:
           pip install --upgrade pip
           pip install -r requirements.txt
           pip install PyVirtualDisplay
+          pip install pytest-timeout
           pip install pytest-xvfb
           pip install pytest-qt
       - name: Run Tests
-        run: xvfb-run pytest -v
+        run: xvfb-run pytest -v --timeout=90