VisualItem visualItem = captureEvent(handler).getDelta()
.getAddedElements().iterator().next();
VisualItemContainerChangeEventHandler handler2 = mock(VisualItemContainerChangeEventHandler.class);
registration.removeHandler();
underTest.getFullVisualItemContainer().addHandler(handler2);
helper.getContainedResources().remove(resource);
VisualItemContainerChangeEvent event2 = captureEvent(handler2);