How do I run test for my survey in code pen

Can someone tell me how I could test my survey form, because in other people code pen project, they have this “Select text suite” thing that test the project base on what it is.

I did it already, but I saw some survey or website on code pen that show a small box which allow us to check our work to see if it pass all the requirements or not. So, I also want to try it, but I dont know how.

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