本文介绍了模拟 ScheduledExecutorService.scheduleWithFixedDelay(...) 返回 null的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在我的单元测试中，我已将 ScheduledExecutoryService 类的模拟实例注入到我要测试的类中，以便 scheduleAtFixedRate(...) 方法被调用，它返回一个模拟的 Future.但出于某种原因，它总是返回 null.有什么想法吗?
In my unit test, I've injected a mocked instance of the ScheduledExecutoryService class into the class that I'm trying to test so that when the scheduleAtFixedRate(...) method is called, it returns a mocked Future. For some reason though, it's always returning null. Any ideas ?
应用代码:
Future<?> t =
scheduledExecutorService.scheduleAtFixedRate(this, 10, 10, TimeUnit.SECONDS);
测试代码:
@Mock ScheduledExecutorService scheduledExecutorService;
@Mock ScheduledFuture<?> t;
Mockito.doReturn(t).when(scheduledExecutorService).scheduleWithFixedDelay(
any(Runnable.class), anyLong(), anyLong(), any(TimeUnit.class));
推荐答案
尽管您期望的是 Long 值，但您正在传递整数(这可能是方法参数的定义).
You are passing Integers (and probably that is the definition of the method parameters) though you are expecting Long values.
更改为:
Mockito.doReturn(t).when(scheduledExecutorService).scheduleWithFixedDelay(
any(Runnable.class), anyInt(), anyInt(), any(TimeUnit.class));
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