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swift-protocol-di-testing

Decouple Swift business logic from external dependencies using protocol-based dependency injection.

Updated May 9, 2026
Search Tags:#swift#ios#unit-testing#dependency-injection#sendable#swift-testing#mock-objects
One-click install
npx skills add https://github.com/kk20300113-png/my-claude-skills --skill swift-protocol-di-testing-kk20300113-png
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: swift-protocol-di-testing
Source: https://github.com/kk20300113-png/my-claude-skills/tree/main/swift-protocol-di-testing
Command: npx skills add https://github.com/kk20300113-png/my-claude-skills --skill swift-protocol-di-testing-kk20300113-png

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill solves the problem of untestable Swift code that is tightly coupled to external dependencies like file systems, networks, and iCloud APIs, which prevents developers from writing deterministic unit tests and validating error handling paths without triggering real I/O operations.

Core Features & Use Cases

  • Protocol abstraction for external dependencies: Defines small, focused, Sendable-compliant protocols for file system, network, and API access to decouple business logic from implementation details.
  • Production and mock implementations: Includes default production implementations and configurable mock implementations for simulating error scenarios and edge cases during testing.
  • Swift Testing integration: Provides ready-to-use test examples using the modern Swift Testing framework to validate dependency injection workflows.
  • Use Case: For example, if you are building a Swift app that syncs user data to iCloud, use this Skill to mock the file system and network layers to test sync failure paths without making real network requests or modifying user data.

Quick Start

Use the swift-protocol-di-testing skill to refactor your existing Swift data sync service to use protocol-based dependency injection so you can write deterministic unit tests for its error handling paths.

Frequently Asked Questions about swift-protocol-di-testing

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I unit test Swift business logic without triggering real network or iCloud requests?▼

Protocol-based dependency injection decouples Swift business logic from file systems, networks, and iCloud APIs. This enables deterministic unit testing by replacing real external dependencies with configurable mock implementations that simulate error scenarios.

How do I mock file system and network layers in Swift to test sync failure paths?▼

Define small, focused protocols for file system and network access, then provide configurable mock implementations. This allows you to simulate error scenarios and edge cases to test sync failure paths without making real network requests or modifying user data.

Does protocol-based dependency injection work with Swift concurrency and Sendable types?▼

Yes, protocol-based dependency injection defines Sendable-compliant protocols to ensure testable architecture with Swift concurrency features like actors. This allows seamless cross-environment compatibility across app, test, and SwiftUI preview contexts.

Can I use Swift Testing framework to validate dependency injection workflows?▼

Yes, this approach provides ready-to-use test examples using the modern Swift Testing framework. It validates dependency injection workflows to ensure full test coverage of external dependency interactions and error handling paths.

What is the best way to decouple Swift code from external APIs for testable architecture?▼

Protocol abstraction defines small, focused protocols for API access to separate business logic from implementation details. This approach includes default production implementations alongside configurable mocks, ensuring testable architecture across different environments.

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