qa-principles

Test design and test strategy toolkit - ISTQB techniques, SFDPOT and HICCUPPS heuristics, property-based, stateful and mutation testing, test doubles, test smells and flaky-test causes. Use when deciding which test cases to write for a function or feature, assessing a test suite or strategy, hunting coverage gaps, or fixing flaky tests, but not for the red-green-refactor loop itself (Superpowers test-driven-development); load it before answering so each case names its technique and the risk it covers.