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tdd

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测试驱动开发。当用户想以测试先行构建功能或修复 bug、提到 "red-green-refactor"，或想要集成测试时使用。

skills/engineering/tdd/SKILL.md

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# 测试驱动开发（Test-Driven Development）

TDD 是红 → 绿的循环。本技能是让这个循环产出值得保留的测试的参考：好测试是什么、测试放在哪里、反模式有哪些、循环的规则是什么。每一节在每一个循环中都适用——在循环之前和之中查阅它们，而不是之后。

探索代码库时，读 `GLOSSARY.md`（如果存在），让测试名称和接口词汇与项目的领域语言一致，并尊重你正在触碰的区域的 ADR。

## 好测试是什么

测试通过公共接口验证行为，而不是实现细节。代码可以彻底改变；测试不应该。好测试读起来像一份规格——"用户可以用有效购物车结账"精确地告诉你存在什么能力——而且因为它不关心内部结构，能在重构中存活。

示例见 [tests.md](tests.md)，mocking 指南见 [mocking.md](mocking.md)。

## 接缝——测试放在哪里
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