A Terraform module passes every mocked test, but its first real apply fails. What did the tests prove, and what would you add?

A mock can confirm that a module requests private storage while missing the IAM denial that stops creation. Separate configuration contracts from provider behavior, and make the costly tests deliberate.

Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.