testing-lazy-lists

What problem does it solve?

It solves flaky Compose UI tests for LazyColumn, LazyRow, and LazyVerticalGrid where off-screen items break naive assertions and scrolling by text.

Core Features & Use Cases

• Semantic-first scrolling: Scroll by index or key using the list’s semantic actions, with test-tag disambiguation when multiple scrollables exist.
• Correct visibility assertions: Use assertIsDisplayed instead of assertExists to avoid false positives from lazy composed or detached semantics.
• Ground-truth verification: Read LazyListState.layoutInfo.visibleItemsInfo to confirm what is actually visible, including when animations reorder items.

Quick Start

Use testing-lazy-lists to reliably tag the Lazy container and items, scroll via performScrollToIndex or performScrollToKey, and assert on-screen items with assertIsDisplayed while validating visibility using state.layoutInfo.visibleItemsInfo.