Is this expected? This test fails: ``` @Test fun t...

# coroutines

[Martin Devillers]

Is this expected?
This test fails:

@Test
fun test() = runBlocking {
    assertTrue(actor<Unit> { for (it in this) {  } }.offer(Unit))
}

But this test passes:

@Test
fun test() = runBlocking {
    val actor = GlobalScope.actor<Unit> { for (it in this) {  } }
    delay(100)
    assertTrue(actor.offer(Unit))
}

It’s like the actor’s queue needs some time to be set up. It’s not ready right away after creation.

[elizarov]

It is expected. It is not about setting up queue. This is not how or why you’d use offer.

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

The first test fails because your test coroutine never gives the actor coroutine a chance to run. Your second test does this by calling delay, but I think you should get the same result if you just used yield.

offer will only succeed if there is a coroutine that is currently suspended waiting for something from the channel. Since the actor never has a chance to run, it never receives from its channel, so the offer fails.