I totally agree with you. In the end you need different kinds of tests (end-to-end, unit, ...). And with legacy code, you probably want to start with end-to-end

I totally agree with you. In the end you need different kinds of tests (end-to-end, unit, ...). And with legacy code, you probably want to start with end-to-end tests or integrated tests. But in that specific case, no amount of tests would have helped us...