if you are doing the project on codepen form the pen that has only the test suite, save it in your own account and work on that one, then press “Run tests” in the test suite
You can build your project by forking this CodePen pen. Or you can use this CDN link to run the tests in any environment you like: https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js .
On your Codepen Tribute Page click the “Settings” button up top and go to the JavaScript tab now in one of the boxes at the bottom paste in the test script: