Swift Protocol Di Testing
affaan-m/everything-claude-codeTesting Swift code that talks to the file system or network can be tricky. This pattern solves that problem by using small protocols to represent each external service. You can then swap real services with mock versions during tests.
You define a protocol for each concern like reading files or saving data. Then you create a production version that uses the real system and a mock version that runs in memory. Your code asks for these services through dependency injection with default values.
This approach makes tests fast and reliable. You can test error paths without triggering real failures. Your code works in apps, tests, and even SwiftUI previews with no changes.
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