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swift-protocol-di-testing

基于协议的依赖注入（Protocol-based Dependency Injection），通过精简的协议和 Swift 测试框架（Swift Testing）来模拟文件系统、网络和外部 API，编写可测试的 Swift 代码。

skills/swift-protocol-di-testing/SKILL.md

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# 基于 Swift 协议的依赖注入（Testing）

通过将外部依赖（文件系统、网络、iCloud）抽象到精简且功能集中的协议（Protocols）后面，使 Swift 代码变得可测试。这种模式支持无需实际 I/O 即可进行确定性测试（Deterministic Tests）。

## 何时激活

- 编写访问文件系统、网络或外部 API 的 Swift 代码时
- 需要在不触发实际故障的情况下测试错误处理路径时
- 构建需要在不同环境（App、测试、SwiftUI 预览）下运行的模块时
- 使用 Swift 并发（Concurrency，如 Actor、Sendable）设计可测试架构时

## 核心模式

### 1. 定义精简且功能集中的协议