swiftui-testing

# SwiftUI Testing

## Unit Testing ViewModels

```swift
@MainActor
final class ProfileViewModelTests: XCTestCase {
    var sut: ProfileViewModel!
    var mockRepository: MockUserRepository!

    override func setUp() {
        super.setUp()
        mockRepository = MockUserRepository()
        sut = ProfileViewModel(repository: mockRepository)
    }

    override func tearDown() {
        sut = nil
        mockRepository = nil
        super.tearDown()
    }

    func testLoadUser_Success() async {
        // Given
        let expectedUser = User(id: "1", name: "John")
        mockRepository.stubbedUser = expectedUser

        // When
        await sut.loadUser(id: "1")

        // Then
        XCTAssertEqual(sut.user, expectedUser)
        XCTAssertFalse(sut.isLoading)
        XCTAssertNil(sut.error)
    }

    func testLoadUser_Failure() async {
        // Given
        mockRepository.shouldFail = true

        // When
        await sut.loadUser(id: "1")

        // Then
        XCTAssertNil(sut.user)
        XCTAssertNotNil(sut.error)
    }
}
```

## Mock Repository Pattern

```swift
final class MockUserRepository: UserRepositoryProtocol, @unchecked Sendable {
    var stubbedUser: User?
    var shouldFail = false
    var fetchCallCount = 0

    func fetch(id: String) async throws -> User {
        fetchCallCount += 1
        if shouldFail {
            throw NSError(domain: "Test", code: -1)
        }
        return stubbedUser ?? User(id: id, name: "Test")
    }
}
```

## UI Testing with Accessibility

```swift
final class ProfileUITests: XCTestCase {
    var app: XCUIApplication!

    override func setUp() {
        continueAfterFailure = false
        app = XCUIApplication()
        app.launchArguments = ["UI_TESTING"]
        app.launch()
    }

    func testProfileFlow() {
        // Navigate to profile
        let profileTab = app.tabBars.buttons["Profile"]
        XCTAssertTrue(profileTab.waitForExistence(timeout: 5))
        profileTab.tap()

        // Ve