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tdd

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测试驱动开发。适用于用户想用先写测试的方式构建功能或修复缺陷、提到 “red-green-refactor”，或需要集成测试时。

skills/engineering/tdd/SKILL.md

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# 测试驱动开发

TDD 是 red -> green loop。这个 skill 是让该 loop 产出值得保留的 tests 的 reference：什么是好 test、tests 应该放在哪里、anti-patterns，以及 loop 的规则。每个 cycle 前和 cycle 中都要参考这些内容，而不是事后才看。

探索 codebase 时，读取 `GLOSSARY.md`（如果存在），让 test names 和 interface vocabulary 与项目 domain language 对齐，并尊重你触碰区域的 ADRs。

## 什么是好 test

Tests 应通过 public interfaces 验证 behavior，而不是 implementation details。代码可以完全改变；tests 不该随之改变。一个好 test 读起来像 specification："user can checkout with valid cart" 能清楚说明存在什么能力；因为它不关心 internal structure，所以能承受 refactors。

示例见 [tests.md](tests.md)，mocking 规则见 [mocking.md](mocking.md)。

## Seams：tests 放在哪里
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