>Over time it lead to a test suite that takes a long time to run, slowing down the release process considerably Slower, but the test suite is far more effectiv

>Over time it lead to a test suite that takes a long time to run, slowing down the release process considerably Slower, but the test suite is far more effective at catching bugs. These tests do take more up front engineering but since they arent pale imitations of the code they also dont need to be totally rewritten every time the code is refactored. Higher capex, lower opex.