diff --git a/.github/workflows/CI-unixish.yml b/.github/workflows/CI-unixish.yml
index 854e5d5bf5f..31e58a2b3c1 100644
--- a/.github/workflows/CI-unixish.yml
+++ b/.github/workflows/CI-unixish.yml
@@ -425,6 +425,21 @@ jobs:
           ../../cppcheck --dump naming_test.cpp 
           python3 ../naming.py --var='[a-z].*' --function='[a-z].*' naming_test.cpp.dump
 
+      - name: test addons (Python)
+        if: matrix.os != 'ubuntu-22.04'
+        run: |
+          python3 -m pytest -Werror --strict-markers -vv addons/test
+        env:
+          PYTHONPATH: ./addons
+
+      # we cannot specify -Werror since xml/etree/ElementTree.py in Python 3.10 contains an unclosed file
+      - name: test addons (Python)
+        if: matrix.os == 'ubuntu-22.04'
+        run: |
+          python3 -m pytest --strict-markers -vv addons/test
+        env:
+          PYTHONPATH: ./addons
+
       - name: Build democlient
         if: matrix.os == 'ubuntu-22.04'
         run: |
diff --git a/.github/workflows/CI-windows.yml b/.github/workflows/CI-windows.yml
index 7234d55aa23..2caec0bc6ba 100644
--- a/.github/workflows/CI-windows.yml
+++ b/.github/workflows/CI-windows.yml
@@ -224,6 +224,13 @@ jobs:
           ..\..\cppcheck --dump naming_test.cpp || exit /b !errorlevel!
           python3 ..\naming.py --var='[a-z].*' --function='[a-z].*' naming_test.cpp.dump || exit /b !errorlevel!
 
+      - name: test addons (Python)
+        if: matrix.config == 'release'
+        run: |
+          python -m pytest -Werror --strict-markers -vv addons/test || exit /b !errorlevel!
+        env:
+          PYTHONPATH: ./addons
+
       - name: Check Windows test syntax
         if: matrix.config == 'debug'
         run: |