@Test
 public void should_return_empty_Collection_if_Component_is_null() {
   assertThat(finder.nonExplicitChildrenOf(null)).isEmpty();
 }
 @Test
 public void should_return_empty_Collection_if_Component_is_not_JDesktopPane() {
   Container container = textField().createNew();
   assertThat(finder.nonExplicitChildrenOf(container)).isEmpty();
 }