Notes on Testing: Why I Prefer Testcontainers...

I've wasted entire Fridays writing "perfect" mocks for my database layer. I'd spend hours defining exactly what GetByID should return, only to have the app crash in production because of a missing comma in my SQL or a misunderstood Postgres constraint. That's the problem: mocks don't test your code, they test your assumptions about your code. And usually, your assumptions are wrong. ...And that's why I've mostly moved to Testcontainers. I'd rather wait ten seconds for a real Docker container to