Compose Accessibility Testing: Catching Hidden Regressions in the Semantics Tree

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A design system migration replaced IconButton usages with a new AppIconButton that silently dropped content descriptions, and the change passed compiler, screenshot, and unit checks. Accessibility regressions don't crash or alter pixels, so the article argues they must be caught by testing the semantics tree that TalkBack reads. The proposed fix is a required contentDescription parameter with no default, backed by layered tests. Those tests range from targeted assertions on high-risk nodes to bulk checks, touch-size validation, automated audits with Google's Accessibility Test Framework, and a short manual TalkBack routine. Tests should resolve labels from string resources rather than hard-coded text, so they remain valid when copy changes or the suite runs in other locales.

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