Shell Testing Framework

This is for anyone who needs to write proper test suites for bash scripts and wants actual structure instead of scattered echo statements. It teaches the unix-goto testing approach: strict arrange-act-assert patterns, four mandatory test categories (unit, integration, edge case, performance), and a 100% coverage requirement for all core features. You get the complete test file template, assertion helpers, and real examples like cache lookup tests that check both output and exit codes. The TDD workflow is baked in. If you're writing shell scripts that matter and need reproducible testing rather than manual validation, this gives you a real framework.