swift-protocol-di-testing
Protocol-based dependency injection for testable Swift code with focused abstractions and Swift Testing.
- Define small, single-responsibility protocols for each external concern (file system, network, APIs) and provide default production implementations
- Create mock implementations with configurable error properties to test failure paths deterministically without real I/O
- Inject dependencies via default parameters so production code uses real implementations automatically while tests override with mocks
- Ensure
Sendableconformance on protocols and mocks for safe use across actor boundaries in Swift concurrency
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.
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