iOS Unit Testing by Example

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Fearlessly transform your iOS code with robust unit tests using Xcode's XCTest framework and Swift. Gain rapid feedback on your entire codebase, including legacy code, by mastering testing techniques for all iOS components, particularly UIViewControllers, which are essential for app functionality. Discover how to isolate and replace dependencies in legacy code that lacks tests, enabling safe refactoring and ensuring that your modifications are verified promptly and automatically. This approach allows you to make significant changes with confidence, as manual testing becomes increasingly cumbersome with complex navigation hierarchies. Automatic unit testing revolutionizes development by providing immediate feedback, making it feasible to incorporate testing even into legacy code. Expand your unit testing practices beyond model classes to include critical UIViewControllers, enhancing your testing strategy. Good unit tests serve as a foundation for safe refactoring, empowering you to implement bold changes. Learn to avoid common pitfalls with the XCTest framework, utilize code coverage to identify gaps in your tests, and recognize hard dependencies. This knowledge will enable you to reshape your code's design swiftly, reducing risk and fostering a fearless approach to development.