asserting-bounds-and-dimensions

What problem does it solve?

It solves the problem of unreliable Compose UI assertions by helping you verify layout sizes, positions, padding, and touch-target dimensions in dp with the framework’s expected tolerance model.

Core Features & Use Cases

• dp-typed size and position assertions: Use APIs like assertWidthIsEqualTo, assertHeightIsAtLeast, and assertPositionInRootIsEqualTo instead of pixel math.
• clipped vs unclipped bounds correctness: Use getUnclippedBoundsInRoot() for layout math (padding/gap/alignment) and getBoundsInRoot() only for what users see after clipping.
• touch-target verification: Use assertTouchWidthIsEqualTo / assertTouchHeightIsEqualTo to validate tap accessibility rather than visual bounds.
• alignment line and link bounds support: Read baseline via getAlignmentLinePosition and inspect annotated text ranges with getFirstLinkBounds.

Quick Start

Use this skill to assert a composable’s width/height and its position in the root using the dp-typed assertions and unclipped bounds for padding math.