@Test
public void testTraverseByObjectsCallsDelegate() throws Exception {

  TraverseByObjectsDelegate delegate = mock(TraverseByObjectsDelegate.class);
  when(delegateProvider.get(TraverseByObjectsDelegate.class)).thenReturn(delegate);
  TraverseGraphByObjectsRequest request = new TraverseGraphByObjectsRequest();
  service.traverse(RequestHeader.builder().build(), request);
  verify(delegate).handle(request);
}