Pomodoro Clock : Testing Suite Claims Zero is Never Reached

https://codepen.io/hirodashi/pen/abvzEbp?editors=0011

The testing suite claims that my timer never reaches zero, but you can clearly see it hit zero and play a sound in the browser.

Does anyone see a reason why? Is it worth scrapping the logic I created? I may need to follow one of the “official” tutorials and just re-do things.

Thank you!