When use liveData and change to flow by .asFlow() test won't trigger events #117
Comments
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I have never used LiveData. Can you provide a self-contained failing test case? |
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So we have some situation that live data is converted to flow in our useCases. In bellow test cases, test1 will fails but second will pass. |
mahdit8
changed the title
mahdit8
changed the title
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Hey @JakeWharton I feel issue is some-how about coroutine scope here: And we should support this |
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I see no issue with Turbine. Your testing approach was missing some key components. Both tests succeed here : class TurbinFlowTest {
// Needed to Unit Test LiveData
@get:Rule
val instantTaskExecutorRule = InstantTaskExecutorRule()
// Some stuff from coroutine testing 1.6, check https://www.youtube.com/watch?v=tCliepyQfHQ for example for more information
private val testCoroutineDispatcher = StandardTestDispatcher()
private val testCoroutineScope = TestScope(testCoroutineDispatcher)
private val flow1 = liveData {
for (i in 1..10) {
delay(100)
emit(i)
}
}.asFlow()
private val flow2 = flow {
for (i in 1..10) {
delay(100)
emit(i)
}
}
@Before
fun setUp() {
Dispatchers.setMain(testCoroutineDispatcher)
}
@After
fun teardown() {
Dispatchers.resetMain()
}
@Test
fun `Should catch events when use flow that converted from live data with asFlow()`() = testCoroutineScope.runTest {
flow1.test {
val item = awaitItem()
Assert.assertNotNull(item)
cancelAndIgnoreRemainingEvents()
}
}
@Test
fun `Should catch events when use flow direct constructor`() = testCoroutineScope.runTest {
flow2.test {
val item = awaitItem()
Assert.assertNotNull(item)
cancelAndIgnoreRemainingEvents()
}
}
}I recommend you take a look to this wonderful guide too : https://developer.android.com/kotlin/coroutines/coroutines-best-practices |
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Thanks for response, for minimizing the question I did not pass dispatchers and as long as no dispatcher change I think Could you check if you see same issue? |
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Hi
I have an issue when convert live data to flow like:
Then I got this error
After waiting for 60000 ms, the test coroutine is not completing, there were active child jobs: [ScopeCoroutine{Active}@35c3ef4a]Previously I faced this issue and find out that in some case should
awaitComplete()but it some case that will also not works.The text was updated successfully, but these errors were encountered: