Individual skill
qa/unit-testing
单元测试方法论，覆盖 AAA 模式、Test Doubles、跨语言示例（JS/TS、Python、Go、Java）、前后端单元测试、边界与属性测试、变异测试
skill/skills/qa/unit-testing/SKILL.md
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# 单元测试方法论
## 单元测试的定义与原则
单元测试验证**最小可测试单元**（函数、方法、类、组件）的行为，隔离外部依赖。
### 核心原则
| 原则 | 说明 |
| -------- | ------------------------------------------------ |
| **隔离** | 一个测试只验证一个行为，不依赖其他测试或外部系统 |
| **快速** | 毫秒级执行，全部单元测试应在秒级完成 |
| **确定** | 相同输入多次运行结果一致，不依赖时间/网络/随机数 |
| **可读** | 测试代码即文档，命名清晰表达意图 |