Run Tests button not working

Hi Support
I’ve noticed that the “Run the Tests” button is not working anymore for me. Usually down the bottom it tells me which aspects have passed or failed. From “ES6: Set Default Parameters for Your Functions” onwards it’s not working (link below). Pages before that work fine. I have tried different browers, computers and networks to no avail.

Stratch that. It’s working now. I entered the code wrong. Strange that it didn’t run the test at all though and tell me which tests failed.