### Question:
ResolvedPolicyClassifierListener extends DataTreeChangeHandler<ResolvedPolicy> { @Override protected void onDelete(DataObjectModification<ResolvedPolicy> rootNode, InstanceIdentifier<ResolvedPolicy> rootIdentifier) { LOG.debug("Delete is not supported yet."); } ResolvedPolicyClassifierListener(DataBroker dataProvider, OFStatisticsManager ofStatsManager); static Map<InstanceIdentifier<Classifier>, Classifier> resolveClassifiers(ResolvedPolicy resolvedPolicy,
            InstanceIdentifier<ResolvedPolicy> resolvedPolicyIid);  }### Answer:
@Test public void testOnDelete() { when(rootNode.getModificationType()).thenReturn(DataObjectModification.ModificationType.DELETE); classifierListener.onDataTreeChanged(changes); verify(classifierListener).onDelete(rootNode, rootIdentifier); }