[Pharo-dev] Necessity of TDD with Smalltalk

It seems to me that a big reason for developing via writing tests first (Test Driven Development) is that the tests serve as a debugging tool -- if a test breaks, then the last piece of (non-test) code that change is likely the culprit. But with the powerful debugging environment that comes with Smalltalk, I am wondering of the utility of TDD (TDD is big in the Ruby camp perhaps for a reason). After all, writing and re-writing the tests becomes quite a non-trivial chore (not to mention that the tests themselves could be buggy). So my question: Is it ok in Smalltalk to write tests afterwards? Is it even perhaps recommended? - Paul