protocol-di-testing

What problem does it solve?

Swift applications often suffer from hard-to-test code when external dependencies like file systems, networks, or services are embedded directly. This Skill provides a structured approach to introduce protocol-based dependency injection, enabling isolation, mocking, and deterministic tests.

Core Features & Use Cases

• Protocol-based boundaries: Define small, focused protocols for each external dependency to enable substitute implementations in tests.
• Production & mock implementations: Supply default production implementations alongside mock variants tailored for unit tests.
• Test wiring & injection: Centralize dependency wiring so tests can swap real and mock components with minimal changes.

Quick Start

Follow the approach to generate a testable Swift module by introducing small protocols for each external dependency and inject mock implementations in your tests.