CI: run unittests after build

Author: swt2c

.github/workflows/ci-build.yml

@@ -209,7 +209,10 @@ jobs:
           cd dist
           pip install wxPython-*.whl
           python -c "import wx; print(wx); print(wx.version()); print(wx.PlatformInfo)"
-          pip uninstall --yes wxPython
+
+      - name: Run unittests
+        run: |
+          python build.py test
 
       - name: Save wheel as job artifact
         uses: actions/upload-artifact@v4