Does this skill require any third-party dependencies?

No, it utilizes native Swift language features and standard libraries to implement professional-grade dependency injection and mocking.

Why use protocols instead of classes for dependency injection in Swift?

Protocols allow for cleaner abstractions, support for value types like structs, and easier creation of mock objects without the overhead of class inheritance.

How does this skill handle Swift's modern concurrency features?

The patterns provided include Sendable conformance and Actor-safe injection methods to ensure your testable architecture works seamlessly with structured concurrency.

Is this compatible with the new Swift Testing framework?

Yes, it is specifically designed to leverage the features of the new Swift Testing framework while remaining compatible with XCTest.

Swift Protocol-Based DI Testing

Name: Swift Protocol-Based DI Testing
Author: Fabio29T

byFabio29T

0•

Mobile Development

Implements protocol-oriented dependency injection patterns to create highly testable Swift applications with deterministic mocks for I/O and networking.

This skill provides a standardized approach to architecting Swift applications for testability by abstracting external dependencies—such as file systems, network layers, and external APIs—into small, focused protocols. It enables developers to write deterministic unit tests that run without actual I/O, facilitates the simulation of edge-case error paths that are difficult to trigger in production, and ensures architectural compatibility with modern Swift features like Actors and Sendable protocols. By providing ready-to-use patterns for both production implementations and mock objects, it helps maintain a clean separation of concerns throughout the development lifecycle.

Key Features

01Deterministic mock implementations for I/O-free unit testing

02Constructor-based injection with production-ready default parameters

030 GitHub stars

04Protocol-oriented abstraction for file systems, networks, and APIs

05Full compatibility with Swift Testing and XCTest frameworks

06Concurrency-safe patterns using Sendable and Actor-based designs

Use Cases

01Simulating network failures and API timeouts to verify robust error handling

02Mocking file system access to test persistence logic without actual disk writes

03Creating stable SwiftUI previews by injecting mock data providers

Key Features

01Deterministic mock implementations for I/O-free unit testing

02Constructor-based injection with production-ready default parameters

030 GitHub stars

04Protocol-oriented abstraction for file systems, networks, and APIs

05Full compatibility with Swift Testing and XCTest frameworks

06Concurrency-safe patterns using Sendable and Actor-based designs

Use Cases

01Simulating network failures and API timeouts to verify robust error handling

02Mocking file system access to test persistence logic without actual disk writes

03Creating stable SwiftUI previews by injecting mock data providers