In my first few months of my first dev job, I written this fragile piece of code in, trigger warning, PHP that sent out email reports to my clients. It was a two men team, and we have no clue about TDD or how to do unit testing for such code. We would just run that piece of code manually do send out dummy emails to ensure things were working.

One day the code broke. I was told by my boss to fix it. Spent the entire day trying to fix but couldn't get anything done. Finally at around 7pm my boss came by and asked why is it I couldn't get it fixed. He helped me troubleshoot and fixed it. And subsequently told me "c'mon man you're better than this."

It turns out that he changed a part of a code that was supposed return an array of strings to an array of objects, adding a second attribute that wasn't even in use.

So what that meant is that he changed a piece of working code, to include a property he didn't need, committed and push to production without even manually testing it. AND TALKED SHIT TO ME.

That was the day I learned git blame and began my journey on TDD.