How to Create Mocks and Stubs in Swift

This article provides a step-by-step guide on how to create mocks and stubs in Swift for unit testing, especially when a full mocking framework like OCMock is not available. It explains an 8-step process involving designing testable classes with dependency injection, creating nested mock classes inside XCTestCase, overriding specific functions, and injecting the mock into the class under test. The example focuses on mocking NSManagedObjectContext for CoreData applications to simulate database responses. The article includes a link to a sample Xcode project on GitHub and encourages reader feedback for alternative approaches.