Support Invoking suspend function

[ychescale9]

Right now to assert that invoking a suspend function throws an exception we have to do something like:

@Test
fun testASuspendFunctionThatThrowsTheExpectedException() {
    suspend fun func() {
        suspendCancellableCoroutine<Any> { throw IndexOutOfBoundsException() }
    }
    invoking {
        runBlocking {
            func()
        }
    } shouldThrow IndexOutOfBoundsException::class
}

Coroutines's runBlocking and runBlockingTest (from kotlinx-coroutines-test artifact) functions already provide a CoroutineScope as a lambda so it would be good to have a version of invoking that works with suspend functions:

@Test
fun testASuspendFunctionThatThrowsTheExpectedException() = runBlockingTest {
    suspend fun func() {
        suspendCancellableCoroutine<Any> { throw IndexOutOfBoundsException() }
    }
    invokingSuspend {
        func()
    } shouldThrow IndexOutOfBoundsException::class
}

I have this working locally and would love to send a PR if this makes sense.
Thanks!

[ychescale9]

Implementation and tests.

[MarkusAmshove]

Hi @ychescale9 ,

this looks like a nice addition :-)

Feel free to send a PR!

[MarkusAmshove]

This is now implemented and released in v1.54 :-)