ios-testinglisted

## Purpose Test iOS apps at the right level — fast unit tests for logic, UI tests for critical flows. ## Checklist - **Unit tests (XCTest)**: test view models, networking layer, data transformation logic. Fast — no UI dependency. - **UI tests (XCUITest)**: test critical user journeys (login, purchase, settings navigation). Slow — use sparingly. - **Snapshot tests**: use `swift-snapshot-testing` or equivalent for view rendering. Cover default, empty, and error states. - **Performance baselines**: set `measure()` blocks for critical code paths (data parsing, image processing, database queries). - **Test independence**: each test sets up its own state and tears down after. No shared mutable state between tests. - **CI integration**: tests run on every PR. UI tests run on a physical device or simulator matrix covering target OS versions. ## Expected output A test suite where unit tests cover business logic, snapshot tests cover UI rendering, and UI tests cover only critical user journeys.