Java 无限期使用虚拟时间块的反应堆步进验证器

我试图使用Reactor的虚拟时间功能，但测试块会无限期（无超时）或抛出

AssertionError

（有超时）：

例外情况是：

java.lang.AssertionError: VerifySubscribertimed out on reactor.core.publisher.FluxConcatMap$ConcatMapImmediate@66d1af89

使用real time的同一示例与预期的效果相同：

@Test
public void test2() {
    StepVerifier.create(Flux.just(1, 2, 3, 4).delayElements(Duration.ofSeconds(1)))
            .expectSubscription()
            .expectNextCount(4)
            .expectComplete()
            .verify(Duration.ofSeconds(10));
}

从参考资料中，我看不到我下面的第一个示例中有错误

---

怎么了

您需要使用

。然后等待（持续时间）

，否则（虚拟）时钟不会移动，延迟也不会发生。您还可以在

expectSubscription（）

之后使用

.expectNoEvent（Duration）

例如：

@Test
public void test() {
  StepVerifier.withVirtualTime(() -> 
        Flux.just(1, 2, 3, 4).delayElements(Duration.ofSeconds(1)))
        .expectSubscription() //t == 0
//move the clock forward by 1s, and check nothing is emitted in the meantime
        .expectNoEvent(Duration.ofSeconds(1))
//so this effectively verifies the first value is delayed by 1s:
        .expectNext(1)
//and so on...
        .expectNoEvent(Duration.ofSeconds(1))
        .expectNext(2)
//or move the clock forward by 2s, allowing events to take place,
//and check last 2 values where delayed
        .thenAwait(Duration.ofSeconds(2))
        .expectNext(3, 4)
        .expectComplete()
//trigger the verification and check that in realtime it ran in under 200ms
        .verify(Duration.ofMillis(200));
}

@Test
public void test() {
  StepVerifier.withVirtualTime(() -> 
        Flux.just(1, 2, 3, 4).delayElements(Duration.ofSeconds(1)))
        .expectSubscription() //t == 0
//move the clock forward by 1s, and check nothing is emitted in the meantime
        .expectNoEvent(Duration.ofSeconds(1))
//so this effectively verifies the first value is delayed by 1s:
        .expectNext(1)
//and so on...
        .expectNoEvent(Duration.ofSeconds(1))
        .expectNext(2)
//or move the clock forward by 2s, allowing events to take place,
//and check last 2 values where delayed
        .thenAwait(Duration.ofSeconds(2))
        .expectNext(3, 4)
        .expectComplete()
//trigger the verification and check that in realtime it ran in under 200ms
        .verify(Duration.ofMillis(200));
}