Unit test versus UI test in Xcode
WHAT IT TESTS: The scope and tooling difference between test types. OUTLINE: Unit tests (XCTest) exercise code logic in-process and fast; UI tests (XCUITest) drive the app through the accessibility layer, slower and end-to-end.
WHAT IT TESTS: Whether you match test type to what you are verifying. ANSWER OUTLINE: A unit test uses XCTest to call code directly in-process, verifying logic like a function or class quickly and in isolation. A UI test uses the XCUITest API (XCUIApplication, XCUIElement) to launch the app and interact through the accessibility hierarchy, validating end-to-end user flows but running slower and more brittle. You unit-test a sorting algorithm because it is pure logic; you UI-test a login flow because it spans screens and input.
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- #ios
- #testing
- #xctest
- #ui-testing
- #xcode
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