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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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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
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