### Question:
PolicyWriterUtil { public static boolean removePolicyMapEntry(final Class policyMapEntry, final PolicyManagerImpl.PolicyMapLocation location) { final String policyMapName = location.getPolicyMapName(); final DataBroker mountpoint = location.getMountpoint(); final NodeId nodeId = location.getNodeId(); if (policyMapEntry == null) { return true; } boolean result = true; final InstanceIdentifier policyMapEntryIid = policyMapEntryInstanceIdentifier(policyMapName, policyMapEntry.getName()); if (netconfDeleteIfPresent(mountpoint, policyMapEntryIid)) { LOG.trace("Policy-map entry {} removed from node {}", policyMapEntry.getName(), nodeId.getValue()); } else { LOG.warn("Failed to remove policy-map entry {} from node {}", policyMapEntry.getName(), nodeId.getValue()); result = false; } return result; } private  PolicyWriterUtil(); static boolean writeClassMap(@Nonnull final ClassMap classMap,
                                        final PolicyManagerImpl.PolicyMapLocation policyMapLocation); static boolean removeClassMap(final ClassMap classMap, final PolicyManagerImpl.PolicyMapLocation location); static boolean writePolicyMap(final PolicyMap policyMap, final PolicyManagerImpl.PolicyMapLocation location); static boolean removePolicyMap(final PolicyManagerImpl.PolicyMapLocation location); static boolean writePolicyMapEntry(final Class policyMapEntry,
                                              final PolicyManagerImpl.PolicyMapLocation location); static boolean removePolicyMapEntry(final Class policyMapEntry, final PolicyManagerImpl.PolicyMapLocation location); static boolean writeInterface(final PolicyManagerImpl.PolicyMapLocation location); static boolean removeInterface(final PolicyManagerImpl.PolicyMapLocation location); static boolean writeRemote(final ServiceFfName remoteForwarder,
                                      final PolicyManagerImpl.PolicyMapLocation location); static boolean removeRemote(final ServiceFfName remoteForwarder, final PolicyManagerImpl.PolicyMapLocation location); static boolean writeServicePath(final ServiceChain serviceChain,
                                           final PolicyManagerImpl.PolicyMapLocation location); static boolean removeServicePath(final ServiceChain serviceChain, final PolicyManagerImpl.PolicyMapLocation location); static InstanceIdentifier<PolicyMap> policyMapInstanceIdentifier(final String policyMapName); static InstanceIdentifier<ServicePolicy> interfaceInstanceIdentifier(final String ethernetName); static U netconfRead(final DataBroker mountpoint,
                                                       final InstanceIdentifier<U> readIID);  }### Answer:
@Test public void testRemovePolicyMapEntry() throws Exception { LOG.debug("scenario: pass through with empty classEntries collection"); final Class entry = new ClassBuilder().setName(new ClassNameType(UNIT_CLASS_NAME)).build(); assertTrue(PolicyWriterUtil.removePolicyMapEntry(entry, getLocation())); LOG.debug("scenario: fail with one entry, no writeOnlyTransaction"); PowerMockito.stub(PowerMockito.method(PolicyWriterUtil.class, NETCONF_READ)).toReturn(new ClassBuilder().build()); assertFalse(PolicyWriterUtil.removePolicyMapEntry(entry, getLocation())); LOG.debug("scenario: fail with one entry, available writeOnlyTransaction, no readOnlyTransaction"); PowerMockito.stub(PowerMockito.method(NetconfTransactionCreator.class, NETCONF_WRITE_ONLY_TRANSACTION)).toReturn(wTxOptional); when(wTx.submit()).thenReturn(Futures.immediateCheckedFuture(null)); assertTrue(PolicyWriterUtil.removePolicyMapEntry(entry, getLocation())); }