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Snackbar in Compose with Friendly UI Testing Somkiat Khitwongwattana Staff Software Engineer (Android) @ LINE MAN Wongnai

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Hello Compose Multiplatform! OK

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1 2 3 Expect Actual

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Any Solution?

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Any Solution? ● Remove Snackbar message verification

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Any Solution? ● Remove Snackbar message verification ● Create a Snackbar controller & container for UI testing

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What Controller & Container Do? ● Enforce indefinite duration during UI testing ● Manually dismiss using code in UI testing

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Dismiss Snackbar by code Dismiss Snackbar by code

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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

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Recap App SnackbarHostState Provider SnackbarContainer UI Test SnackbarUiTest Controller Inject SnackbarHostState Dismiss Snackbar

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Caution ● Do not expose your test code to production environments, especially in a multi-module project ● Avoid unexpected Snackbar behavior in complex UI

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Thank you Presentation Link