Reproducing the issue

  • Install dependencies using the graal-js npm: npm install.
  • Run tests: npm --jvm test (--polyglot flag is not supported and when manually added to the npm script also does not work) Error message:
  add
    1) should add numbers correctly in python


  0 passing (151ms)
  1 failing

  1) add
       should add numbers correctly in python:
     Error: No language for id python found. Supported languages are: [js]