android-testinglisted

## Purpose Test Android apps at the right level — fast unit tests for ViewModels, UI tests for critical flows. ## Checklist - **Unit tests (JUnit + Robolectric)**: test ViewModels, repositories, and data transformation logic. Robolectric simulates the Android framework for fast test execution. - **Compose UI tests**: use `ComposeTestRule` to test composable rendering and interaction. Cover default, empty, and error states. - **Screenshot tests**: use `Paparazzi` or equivalent for Compose screenshot testing. Catch visual regressions. - **Espresso tests**: for legacy XML-based UI. Don't use for new Compose UI. - **Room DAO tests**: use an in-memory Room database instance. Test queries, migrations, and type converters. - **Test independence**: each test sets up its own state. Use `StandardTestDispatcher`/`UnconfinedTestDispatcher` (`kotlinx-coroutines-test`) for coroutine-based code. ## Expected output A test suite where ViewModels are unit-tested with Robolectric, Compose UI is screenshot-tested, and Room DAOs are integration-tested against an in-memory database.