Add pytest for GUI only

.github/workflows/regression-tests.yml

@@ -71,9 +71,50 @@ jobs:
         path: ./doc/html
         if-no-files-found: ignore
 
+  Pytest:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+      # Add multiple Python versions here to run tests on new(er) versions.
+        python-version: ["3.8"]
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Build and install
+      run: |
+        python -m pip install --upgrade pip
+        # Install with -e (in editable mode) to allow the tracking of the test coverage
+        pip install -e .
+    - name: Analyse the code with pytest
+      run: |
+        # Run the actual testing
+        pytest -v -k test_gui --cov=modelviewer --cov=loadscompare --junitxml=testresult.xml
+        # Create some reports
+        coverage report
+        coverage xml -o coverage.xml
+        # Put the html into a 2nd-level sub-folder and use 1st-level subfolder for uploading to maintain folder
+        coverage html --directory ./coverage/coverage
+    - name: Upload HTML coverage report as an artifact
+      uses: actions/upload-artifact@v3
+      with:
+        name: coverage
+        path: ./coverage
+        if-no-files-found: ignore
+    - name: Upload HTML coverage report for pages
+      # This is not a normal artifact but one that can be deployed to the GitHub pages in the next step
+      uses: actions/upload-pages-artifact@v3
+      with:
+        name: github-pages # This name may not be changed according to the documentation
+        path: ./coverage
+        if-no-files-found: ignore
+
+
   deploy-pages:
     # Add a dependency to the build job
-    needs: Jupyter
+    needs: [Jupyter, Pytest]
 
     # Grant GITHUB_TOKEN the permissions required to make a Pages deployment
     permissions: