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Snackbar in Compose with Friendly UI Testing

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Avatar for Somkiat Khitwongwattana Somkiat Khitwongwattana
September 23, 2025
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Snackbar in Compose with Friendly UI Testing

A guide to creating and testing Snackbar in Jetpack Compose, with a focus on friendly UI testing.

Avatar for Somkiat Khitwongwattana

Somkiat Khitwongwattana

September 23, 2025
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Transcript

  1. Snackbar in Compose with Friendly UI Testing Somkiat Khitwongwattana Staff

    Software Engineer (Android) @ LINE MAN Wongnai

  2. Hello Compose Multiplatform! OK

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  8. 1 2 3 4

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  11. 1 2 3 Expect Actual

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  13. Any Solution?

  14. Any Solution? • Remove Snackbar message verification

  15. Any Solution? • Remove Snackbar message verification • Create a

    Snackbar controller & container for UI testing

  16. What Controller & Container Do? • Enforce indefinite duration during

    UI testing • Manually dismiss using code in UI testing
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  44. Dismiss Snackbar by code Dismiss Snackbar by code

  45. SnackbarContainer Recap SnackbarUiTest Controller SnackbarHostState Provider androidTest Store the SnackbarHostState

    that's created while the app is running, so it can be dismissed in a UI test. Inject the SnackbarHostState into the SnackbarUiTestController using Java Reflection Override the duration to be indefinite when running under UI test. main main

  46. Recap App SnackbarHostState Provider SnackbarContainer UI Test SnackbarUiTest Controller Inject

    SnackbarHostState Dismiss Snackbar

  47. Caution • Do not expose your test code to production

    environments, especially in a multi-module project • Avoid unexpected Snackbar behavior in complex UI

  48. Thank you Presentation Link