How does this skill help with Swift Testing?

It provides templates and patterns for creating mock objects that satisfy protocols, allowing you to use Swift Testing's #expect macros on simulated behaviors rather than real side effects.

Why use protocols instead of #if DEBUG macros?

Protocols provide a cleaner, more modular architecture that avoids polluting production code with conditional compilation and enables more robust dependency management.

Does this support modern Swift Concurrency?

Yes, the skill emphasizes 'Sendable' consistency and protocol design patterns that are fully compatible with Actors and structured concurrency.

Can I use these mocks for SwiftUI Previews?

Absolutely. By injecting mock providers, you can render SwiftUI previews with specific data states or error conditions without needing a live backend or file system.

Swift Protocol DI & Testing

Name: Swift Protocol DI & Testing
Author: affaan-m

byaffaan-m

•

130,863

•

Security & Testing

Implements protocol-based dependency injection patterns to create highly testable Swift applications with deterministic mocks.

This skill provides a standardized framework for decoupling Swift code from external dependencies like file systems, networks, and APIs. By abstracting IO-bound operations into focused protocols and leveraging Swift's modern concurrency features—such as Sendable and Actors—it enables developers to write deterministic tests using the Swift Testing framework. It is particularly useful for simulating complex failure states and ensuring code reliability across different environments like production, unit tests, and SwiftUI previews.

Key Features

01130,863 GitHub stars

02Default parameter injection to maintain clean production codebases

03Standardized protocol-based dependency injection (DI) patterns

04Deterministic mocking for filesystem, network, and external API access

05Ready-to-use Swift Testing boilerplate for error and success paths

06Swift Concurrency integration with Sendable and Actor-safe designs

Use Cases

01Simulating network failures or disk errors that are difficult to trigger in real environments

02Refactoring legacy monolithic Swift code into modular, testable components

03Providing mock data for SwiftUI Previews to accelerate UI development cycles

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add affaan-m/everything-claude-code swift-protocol-di-testing

For use in Claude.ai and ChatGPT

Key Features

01130,863 GitHub stars

02Default parameter injection to maintain clean production codebases

03Standardized protocol-based dependency injection (DI) patterns

04Deterministic mocking for filesystem, network, and external API access

05Ready-to-use Swift Testing boilerplate for error and success paths

06Swift Concurrency integration with Sendable and Actor-safe designs

Use Cases

01Simulating network failures or disk errors that are difficult to trigger in real environments

02Refactoring legacy monolithic Swift code into modular, testable components

03Providing mock data for SwiftUI Previews to accelerate UI development cycles

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add affaan-m/everything-claude-code swift-protocol-di-testing

For use in Claude.ai and ChatGPT