I'm trying to unit test a Kotlin coroutine that uses delay(). For the unit test I don't care about the delay(), it's just slowing the test down. I'd like to run the test in some way that doesn't actually delay when delay() is called.
I tried running the coroutine using a custom context which delegates to CommonPool:
class TestUiContext : CoroutineDispatcher(), Delay {
suspend override fun delay(time: Long, unit: TimeUnit) {
// I'd like it to call this
}
override fun scheduleResumeAfterDelay(time: Long, unit: TimeUnit, continuation: CancellableContinuation<Unit>) {
// but instead it calls this
}
override fun dispatch(context: CoroutineContext, block: Runnable) {
CommonPool.dispatch(context, block)
}
}
I was hoping I could just return from my context's delay() method, but instead it's calling my scheduleResumeAfterDelay() method, and I don't know how to delegate that to the default scheduler.