Add proper tests, exception handling, implement getAbstractName

.github/workflows/build-majestic.yml

@@ -56,3 +56,11 @@ jobs:
       run: |
         pip install pytest
         pytest
+
+    - name: Run JavaScript testsuite
+      working-directory: ./src/runtime/python
+      env:
+        LD_LIBRARY_PATH: /usr/local/lib
+      run: |
+        npm ci
+        npm run test