使用Mockito时避免未检查的警告

Question

我想模拟对ScheduledExecutorService的调用，以便在调用方法schedule时返回ScheduledFuture类的mock。以下代码编译并正常工作：

    ScheduledExecutorService executor = Mockito.mock(ScheduledExecutorService.class);
    ScheduledFuture future = Mockito.mock(ScheduledFuture.class);
    Mockito.when(executor.schedule(
        Mockito.any(Runnable.class),
        Mockito.anyLong(),
        Mockito.any(TimeUnit.class))
    ).thenReturn(future); // <-- warning here

除了我在最后一行收到未检查的警告：

found raw type: java.util.concurrent.ScheduledFuture
  missing type arguments for generic class java.util.concurrent.ScheduledFuture<V>
 unchecked method invocation: method thenReturn in interface org.mockito.stubbing.OngoingStubbing is applied to given types
  required: T
  found: java.util.concurrent.ScheduledFuture
unchecked conversion
  required: T
  found:    java.util.concurrent.ScheduledFuture

有可能以某种方式避免这些警告吗？

像ScheduledFuture<?> future = Mockito.mock(ScheduledFuture.class);这样的代码无法编译。

Answer 1

当使用模拟规范的替代方法时，所有警告都会消失：

    ScheduledFuture<?> future = Mockito.mock(ScheduledFuture.class);
    Mockito.doReturn(future).when(executor).schedule(
        Mockito.any(Runnable.class),
        Mockito.anyLong(),
        Mockito.any(TimeUnit.class)
    );

Answer 2

在方法级别上使用注释。

@SuppressWarnings("unchecked")