@Test
public void testShutdownNow() {

    List<Runnable> expectedRunnableList = new ArrayList<Runnable>();
    when(wrappedExecutorService.shutdownNow()).thenReturn(expectedRunnableList);
    assertSame(expectedRunnableList, tracedExecutorService.shutdownNow());
    verify(wrappedExecutorService).shutdownNow();
    verifyNoMoreInteractions(wrappedExecutorService);
}