@Test(expectedExceptions = ZusammenException.class)
public void testDeleteNonExisting() {

    Id itemId = new Id();
    doReturn(new Response<>(false)).when(stateAdaptorMock).isItemExist(context, itemId);
    doReturn(new Response<>(Void.TYPE)).when(stateAdaptorMock).deleteItem(context, itemId);
    doReturn(new Response<>(Void.TYPE)).when(collaborationAdaptorMock).deleteItem(context, itemId);
    itemManagerImpl.delete(context, itemId);
}