Agent Skills: testing-expert

Framework-agnostic testing strategy — which level to test at, what coverage numbers mean, how to design a test that survives refactoring, how to choose test data, and how to kill flakes. Use when deciding what is worth testing, setting or defending a coverage target, reviewing the shape of an existing suite, or diagnosing a flaky or slow test. Framework-specific work routes to a specialist skill instead of being answered here.