The progress has been saved for the project and you can continue to the next challenge. If you want to confirm if a project has been submitted, go to settings of your freecodecamp account -> scroll down till you reach ‘Certification Settings’, if the code has been successfully submitted, you shall see the project url beside the project title , if the field for project url is empty you’ll have to resubmit the project.
As stated, when you fork the pen the test suite is there.
If you decide to work in another environment, the CDN link is given in every project at the bottom following the required user stories.