Swift Testing Patterns

XCTest Basics

XCTest is Apple's foundational testing framework. Every test class inherits from XCTestCase and uses setUp/tearDown for lifecycle management.

import XCTest
@testable import MyApp

final class UserServiceTests: XCTestCase {
    var sut: UserService!
    var mockStore: MockUserStore!

    override func setUp() {
        super.setUp()
        mockStore = MockUserStore()
        sut = UserService(store: mockStore)
    }