zod-contract-testing

Schemas define contracts between systems. A schema that accepts invalid data is a security hole. A schema that rejects valid data is a broken integration. This skill teaches you to systematically test schemas at system boundaries.

When to use: Testing API request/response schemas, WebSocket message validation, database record parsing, external data ingestion, any Zod schema at a system boundary.

When not to use: Internal type assertions, UI component props, type definitions without runtime validation.

在邊界處驗證 Zod 架構解析。測試有效/無效輸入、模式演變、細化覆蓋率和複合狀態矩陣（2^N 可選欄位組合）。 來源：apankov1/quality-engineering。