The link for tests gives an error message.
Error: Forbidden - This repo/gist is on the blacklist. If you wish to appeal, please open an issue here: https://github.com/schme16/gitcdn.xyz/issues, with why you feel this repo should not be on the blacklist.
Bugs should always be reported as GitHub Issues. Whenever reporting a bug, please check first that there isn’t already an issue for it and provide as much detail as possible.
The issue is being discussed here.