javascript-unit-testing

SKILL.md

Expert guidance for writing maintainable, trustworthy unit tests in JavaScript and TypeScript using Jest. Based on "The Art of Unit Testing, Third Edition" by Roy Osherove with Vladimir Khorikov (Manning, 2024).

A unit of work is all actions between an entry point (function/method we trigger) and one or more exit points (observable results).

Use factory methods instead of beforeEach() to avoid scroll fatigue and keep tests self-contained.

使用 Jest 為 JavaScript 和 TypeScript 編寫高質量的單元測試。涵蓋測試結構（AAA 模式、USE 命名）、打破依賴關係（存根、模擬、依賴注入）、測試異步代碼（承諾、回調、計時器）、避免片狀測試和測試驅動開發。在編寫測試、調試測試失敗、重構測試以實現可維護性或有關 Jest、TDD、模擬、存根或測試最佳實踐的問題時使用。 來源：el-feo/ai-context。

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