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.

Updated Sep 2026 · 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.