延迟测试Kotlin协程的单元

问题描述

我正在尝试对使用delay()的Kotlin协程进行单元测试.对于单元测试，我不在乎delay()，它只是在降低测试速度.我想以某种方式运行测试，该方式实际上不会在调用delay()时延迟.

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.

我尝试使用委托给CommonPool的自定义上下文运行协程:

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)
    }
}

我希望我可以从上下文的delay()方法中返回，但是它正在调用我的scheduleResumeAfterDelay()方法，并且我不知道如何将其委派给默认的调度程序.

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.

推荐答案

在kotlinx.coroutines v1.2.1中，他们添加了 kotlinx-coroutines-test 模块.它包括runBlockingTest协程生成器以及TestCoroutineScope和TestCoroutineDispatcher.它们允许自动前进时间，并通过delay明确控制测试协程的时间.

In kotlinx.coroutines v1.2.1 they added the kotlinx-coroutines-test module. It includes the runBlockingTest coroutine builder, as well as a TestCoroutineScope and TestCoroutineDispatcher. They allow auto-advancing time, as well as explicitly controlling time for testing coroutines with delay.

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