Also related is TDD because writing a test first forces you to focus on module interface early and from the point of view of the module user.

In your example discussion, module tests that employed a mock DNS server running on a different port would have caught this specific module interface issue before the module was released. Not only that, having your own mock DNS server controlled by your tests makes it easier to test module robustness and recovery (for example, how your module handles timeouts, broken connections, data corruption, ...).

In reply to Re^4: Do I have to export all variables and functions from my PM file? by eyepopslikeamosquito
in thread Do I have to export all variables and functions from my PM file? by SergioQ

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