iOS
Combine's asynchronous, declarative model makes testing tricky — pipelines emit values over time, operators transform them, and errors can cancel the stream. This guide covers two approaches: the built-in XCTestExpectation pattern for simple cases, and the CombineExpectations library for ergonomic, readable publisher assertions. You'll write tests
iOS
XCUITest runs your app in a simulator — it's slow, flaky, and gives no introspection into SwiftUI internals. ViewInspector lets you unit test SwiftUI views directly: inspect the view hierarchy, find subviews by type, trigger bindings, simulate button taps, and assert on text values — all without launching a simulator.
Testing
Roughly 1 in 6 people worldwide lives with some form of disability, and on mobile, screen readers like VoiceOver are often the only viable navigation method.
Testing
visionOS introduces entirely new UI paradigms — volumetric windows, immersive spaces, eye tracking, and spatial audio — that existing iOS testing patterns don't cover. This guide walks through XCTest for visionOS, RealityKit entity hierarchy testing, SwiftUI volume and immersive space testing, eye tracking simulation in Simulator, and render budget verification.
Swift
The Composable Architecture (TCA) from Point-Free is a Swift state management library for building apps in a Redux-style unidirectional data flow.
Swift
Swift's built-in testing framework is XCTest, shipped with Xcode and available on all Apple platforms.
Swift
Swift's structured concurrency model — async/await, actors, Task, and MainActor — requires specific testing patterns.
Swift
Swift doesn't have a reflection-based mocking framework like Java's Mockito — the language's static type system makes runtime proxy generation impractical.
Swift
Quick and Nimble are the most popular BDD testing libraries for Swift.
Swift
XCUITest is Apple's framework for automating iOS UI interactions. Tests launch the app in a simulator or on a real device, interact with it like a user would, and assert on what appears on screen. Unlike unit tests, UI tests can catch integration issues — broken navigation, missing screens,
Testing
Apple's built-in testing framework is XCTest. It handles both unit tests and UI tests — and since Xcode 15, the tooling around it has never been better.