XCTest
XCTest is Apple's native testing framework for writing and running unit tests, performance tests, and UI tests for iOS, macOS, tvOS, and watchOS applications. It is integrated directly into Xcode, providing a seamless workflow for developers to ensure code quality and reliability through automated testing. The framework supports both Swift and Objective-C, making it the standard choice for testing Apple platform apps.
Developers should learn XCTest when building apps for Apple platforms (iOS, macOS, etc.) to implement automated testing, which helps catch bugs early, maintain code quality, and support continuous integration. It is essential for writing unit tests to verify individual components, performance tests to measure execution speed, and UI tests to automate user interactions, ensuring apps function correctly across updates and devices.