Patterns for making Swift code testable by abstracting external dependencies (file system, network, iCloud) behind small, focused protocols. Enables deterministic tests without I/O.
- 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)
Key Features
Small focused protocols for external concerns
Default production and mock implementations
Dependency injection with default parameters
Error simulation in mock implementations
Privacy & Security
Data Collection
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