swift-protocol-di-testing

Installation
SKILL.md

Swift Protocol-Based Dependency Injection for Testing

Patterns for making Swift code testable by abstracting external dependencies (file system, network, iCloud) behind small, focused protocols. Enables deterministic tests without I/O.

When to Activate

  • Writing Swift code that accesses file system, network, or external APIs
  • Need to test error handling paths without triggering real failures
  • Building modules that work across environments (app, test, SwiftUI preview)
  • Designing testable architecture with Swift concurrency (actors, Sendable)

Core Pattern

1. Define Small, Focused Protocols

Each protocol handles exactly one external concern.

// File system access
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Mar 4, 2026