Are there any tricks to testing `LaunchedEffect` a...

# compose

[eygraber]

Are there any tricks to testing LaunchedEffect as far as TestDispatcher is concerned?

I'm trying to advanceTimeBy past a delay in a LaunchedEffect but that isn't working because the dispatcher is a AndroidUiDispatcher (or FlushCoroutineDispatcher in desktop).

As far as I can tell, the only way around this is to create a new context (launch, withContext, etc...) that uses the TestDispatcher. Is that correct, or am I missing something?

[Zach Klippenstein (he/him) [MOD]]

Are you using the TestDispatcher from the coroutines testing library?

[eygraber]

Yes, I'm passing UnconfinedTestDispatcher to `runTest`:

[eygraber]

Untitled.kt

[ephemient]

do runComposeUiTest&MainTestClock work for you?

[eygraber]

I can try that, but runComposeUiTest isn't resolving for me on CfD 1.2.0 latest dev build. MainTestClock is resolving.

[eygraber]

Although what I'm testing now relies on ImageComposeScene and those don't seem compatible.

[Zach Klippenstein (he/him) [MOD]]

I'm not sure what the right approach is, @Jelle Fresen [G] ?

[eygraber]

@Igor Demin it looks like this wasn't pulled into CfD dev builds yet. Is that accurate?

[eygraber]

I re-wrote all the tests I had for CfD for Android and they all work, so I'm assuming that CfD's test code doesn't have the latest from upstream? Or there are inconsistencies between the environments that needs addressing in CfD?

[Igor Demin]

Yes, CfD still don’t have runComposeUiTest, because the latest rebase on Jetpack Compose was on 12 of April, but the feature was merged on 28 of April. The next rebase will be in about a month.