swift-protocol-di-testing
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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