Pretty often, especially once you have the project becomes more established. I'd say 80-90% of the time for me right now. I lean very heavily on E2E testing.
I have 2 major products I'm working on:
- a db written in Rust that is 500% faster than SQLite, and has 100% parity. https://inillucent.com/
- an agentic ide written in Rust https://unluminous.com/
Now that they are both well established, I'm able to ship new features quickly, and with very few bugs.