swift-protocol-di-testing

To unit test Swift code with file system or network dependencies, abstract external I/O behind focused protocols and inject configurable mock providers to simulate reads, writes, and errors without real I/O.

Mocking network and file system dependencies in Swift involves defining small, focused protocols for single responsibilities, then providing configurable mock implementations that simulate success, missing containers, and read/write failure conditions.

To inject dependencies into Swift actors while maintaining Sendable conformance, abstract external dependencies behind small protocols, enforce Sendable conformance, and inject these protocols via default parameters for reliable async testing.

Yes, protocol-based dependency injection enables reliable SwiftUI previews by allowing you to inject mock implementations of external services, completely avoiding real network or file system I/O during interface rendering.

Swift unit tests fail when reading or writing JSON from a container due to real I/O side effects; abstracting container access behind focused protocols allows deterministic mock injection to simulate missing containers and prevent failures.

Yes, swift-protocol-di-testing supports simulating error conditions for bookmark storage by defining focused protocols for single responsibilities and providing configurable mock providers that simulate read, write, and storage failures.