> Selective testing is a key technique necessary for working with any large codebase or monorepo: picking which tests to run to validate a change or pull-reques

> Selective testing is a key technique necessary for working with any large codebase or monorepo: picking which tests to run to validate a change or pull-request, because running every test every time is costly and slow. Wait, is it really? Or is it preemptively admitting defeat?