Method answer

netty/src/test/java/io/grpc/netty/WriteQueueTest.java:76–81

(InvocationOnMock invocation)

    EventLoop eventLoop = Mockito.mock(EventLoop.class);
    doAnswer(new Answer<Void>() {
      @Override
      public Void answer(InvocationOnMock invocation) throws Throwable {
        Runnable r = (Runnable) invocation.getArguments()[0];
        r.run();
        return null;
      }
    }).when(eventLoop).execute(any(Runnable.class));
    when(eventLoop.inEventLoop()).thenReturn(true);
    when(channel.eventLoop()).thenReturn(eventLoop);