model-based-testing

Test state machines systematically — don't guess at valid transitions.

State machines are everywhere: workflow states, lifecycle management, game turns, circuit breakers. Most bugs come from invalid transitions being allowed or valid transitions being blocked. This skill teaches you to systematically test ALL state pairs, not just the happy path.

When to use: Any code with named states, lifecycles (initializing → ready → stopping), workflow progressions (draft → review → published), turn-based systems, circuit breakers, or XState machines.

使用 XState 样式模式测试状态机转换。验证转换矩阵、保护真值表、上下文突变和最终状态处理。 来源：apankov1/quality-engineering。