final ListenerRegistration<?> listener = mock(ListenerRegistration.class);
doReturn(listener).when(dOMDataTreeChangeService).registerDataTreeChangeListener(any(), any());
doNothing().when(listener).close();
+ doNothing().when(this.domChain).close();
doReturn(Collections.singletonMap(DOMDataTreeChangeService.class, dOMDataTreeChangeService))
.when(this.domBroker).getSupportedExtensions();