Yes
I had recreated for a few tens of dollars something that would cost $1000 per year to buy
alkonaut on Hacker News
500 source files, several thousand unit tests
In the thread “Sonnet 5.5”, replying to this comment
Helped: Extremely well-specified task with test doubles for verification.
… As a programmer it's kind of chilling. I had recreated for a few tens of dollars something that would cost $1000 per year to buy. Obviously it's not a complete implementation only the parts of the API we use. …