What's Wrong With The Project Test?

Alternatively: What’s wrong with my project?

I’m pretty sure my Javascript calculator is close to completion. It had been passing tests (in fact, for a while, it was passing all of them), but now, it passes none at all. What am I missing? Please help!

Here’s the project:

Here’s a screenshot of the test results:

Any ideas?
Thanks in advance!

Never mind. I had errors in my code that I found. :grinning: