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diff --git a/v3po/v3po2vpp/src/test/java/io/fd/hc2vpp/v3po/write/SubInterfaceCustomizerTest.java b/v3po/v3po2vpp/src/test/java/io/fd/hc2vpp/v3po/write/SubInterfaceCustomizerTest.java
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+++ b/v3po/v3po2vpp/src/test/java/io/fd/hc2vpp/v3po/write/SubInterfaceCustomizerTest.java
@@ -0,0 +1,256 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.hc2vpp.v3po.write;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+import io.fd.hc2vpp.common.test.write.WriterCustomizerTest;
+import io.fd.hc2vpp.common.translate.util.NamingContext;
+import io.fd.honeycomb.translate.write.WriteFailedException;
+import io.fd.jvpp.VppBaseCallException;
+import io.fd.jvpp.core.dto.CreateSubif;
+import io.fd.jvpp.core.dto.CreateSubifReply;
+import io.fd.jvpp.core.dto.SwInterfaceSetFlags;
+import io.fd.jvpp.core.dto.SwInterfaceSetFlagsReply;
+import java.util.Arrays;
+import java.util.List;
+import org.junit.Test;
+import org.mockito.ArgumentCaptor;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.SubinterfaceAugmentation;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319._802dot1ad;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.interfaces._interface.SubInterfaces;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.interfaces._interface.sub.interfaces.SubInterface;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.interfaces._interface.sub.interfaces.SubInterfaceBuilder;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.interfaces._interface.sub.interfaces.SubInterfaceKey;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.match.attributes.match.type.vlan.tagged.VlanTaggedBuilder;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.sub._interface.base.attributes.Match;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.sub._interface.base.attributes.MatchBuilder;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.sub._interface.base.attributes.TagsBuilder;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.sub._interface.base.attributes.tags.Tag;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.sub._interface.base.attributes.tags.TagBuilder;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.sub._interface.base.attributes.tags.TagKey;
+import org.opendaylight.yang.gen.v1.urn.ieee.params.xml.ns.yang.dot1q.types.rev150626.CVlan;
+import org.opendaylight.yang.gen.v1.urn.ieee.params.xml.ns.yang.dot1q.types.rev150626.Dot1qTagVlanType;
+import org.opendaylight.yang.gen.v1.urn.ieee.params.xml.ns.yang.dot1q.types.rev150626.Dot1qVlanId;
+import org.opendaylight.yang.gen.v1.urn.ieee.params.xml.ns.yang.dot1q.types.rev150626.SVlan;
+import org.opendaylight.yang.gen.v1.urn.ieee.params.xml.ns.yang.dot1q.types.rev150626.dot1q.tag.or.any.Dot1qTag;
+import org.opendaylight.yang.gen.v1.urn.ieee.params.xml.ns.yang.dot1q.types.rev150626.dot1q.tag.or.any.Dot1qTagBuilder;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev180220.Interfaces;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev180220.interfaces.Interface;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev180220.interfaces.InterfaceKey;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+public class SubInterfaceCustomizerTest extends WriterCustomizerTest {
+
+    private static final String IFC_TEST_INSTANCE = "ifc-test-instance";
+    private static final String SUPER_IF_NAME = "local0";
+    private static final int SUPER_IF_ID = 1;
+    private static final String SUB_IFACE_NAME = "local0.11";
+    private static final int SUBIF_INDEX = 11;
+    private static final short STAG_ID = 100;
+    private static final short CTAG_ID = 200;
+    private static final short CTAG_ANY_ID = 0; // only the *IdAny flag is set
+    private final Tag STAG_100;
+    private final Tag CTAG_200;
+    private final Tag CTAG_ANY;
+    private NamingContext namingContext;
+    private SubInterfaceCustomizer customizer;
+
+    public SubInterfaceCustomizerTest() {
+        STAG_100 = generateTag((short) 0, SVlan.class, new Dot1qTag.VlanId(new Dot1qVlanId((int) STAG_ID)));
+        CTAG_200 = generateTag((short) 1, CVlan.class, new Dot1qTag.VlanId(new Dot1qVlanId(200)));
+        CTAG_ANY = generateTag((short) 1, CVlan.class, new Dot1qTag.VlanId(Dot1qTag.VlanId.Enumeration.Any));
+    }
+
+    private static Tag generateTag(final short index, final Class<? extends Dot1qTagVlanType> tagType,
+                                   final Dot1qTag.VlanId vlanId) {
+        TagBuilder tag = new TagBuilder();
+        tag.setIndex(index);
+        tag.withKey(new TagKey(index));
+        final Dot1qTagBuilder dtag = new Dot1qTagBuilder();
+        dtag.setTagType(tagType);
+        dtag.setVlanId(vlanId);
+        tag.setDot1qTag(dtag.build());
+        return tag.build();
+    }
+
+    static Match generateMatch() {
+        final MatchBuilder match = new MatchBuilder();
+        final VlanTaggedBuilder tagged = new VlanTaggedBuilder();
+        tagged.setMatchExactTags(true);
+        match.setMatchType(
+                new org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.match.attributes.match.type.VlanTaggedBuilder()
+                        .setVlanTagged(tagged.build()).build());
+        return match.build();
+    }
+
+    @Override
+    public void setUpTest() throws Exception {
+        namingContext = new NamingContext("generatedSubInterfaceName", IFC_TEST_INSTANCE);
+        customizer = new SubInterfaceCustomizer(api, namingContext);
+        defineMapping(mappingContext, SUB_IFACE_NAME, SUBIF_INDEX, IFC_TEST_INSTANCE);
+        defineMapping(mappingContext, SUPER_IF_NAME, SUPER_IF_ID, IFC_TEST_INSTANCE);
+    }
+
+    private SubInterface generateSubInterface(final boolean enabled, final List<Tag> tagList) {
+        SubInterfaceBuilder builder = new SubInterfaceBuilder();
+        builder.setVlanType(_802dot1ad.class);
+        builder.setIdentifier(11L);
+        final TagsBuilder tags = new TagsBuilder();
+
+        tags.setTag(tagList);
+
+        builder.setTags(tags.build());
+
+        builder.setMatch(generateMatch());
+        builder.setEnabled(enabled);
+        return builder.build();
+    }
+
+    private CreateSubif generateSubInterfaceRequest(final int superIfId, final short innerVlanId,
+                                                    final boolean isInnerAny) {
+        CreateSubif request = new CreateSubif();
+        request.subId = 11;
+        request.swIfIndex = superIfId;
+        request.twoTags = 1;
+        request.innerVlanId = innerVlanId;
+        request.innerVlanIdAny = (byte) (isInnerAny
+                ? 1
+                : 0);
+        request.dot1Ad = 1;
+        request.outerVlanId = STAG_ID;
+        request.exactMatch = 1;
+        return request;
+    }
+
+    private SwInterfaceSetFlags generateSwInterfaceEnableRequest(final int swIfIndex) {
+        SwInterfaceSetFlags request = new SwInterfaceSetFlags();
+        request.swIfIndex = swIfIndex;
+        request.adminUpDown = 1;
+        return request;
+    }
+
+    private InstanceIdentifier<SubInterface> getSubInterfaceId(final String name, final long index) {
+        return InstanceIdentifier.create(Interfaces.class).child(Interface.class, new InterfaceKey(name)).augmentation(
+                SubinterfaceAugmentation.class).child(SubInterfaces.class)
+                .child(SubInterface.class, new SubInterfaceKey(index));
+    }
+
+    private void whenCreateSubifThenSuccess() {
+        doReturn(future(new CreateSubifReply())).when(api).createSubif(any(CreateSubif.class));
+    }
+
+    /**
+     * Failure response send
+     */
+    private void whenCreateSubifThenFailure() {
+        doReturn(failedFuture()).when(api).createSubif(any(CreateSubif.class));
+    }
+
+    private void whenSwInterfaceSetFlagsThenSuccess() {
+        doReturn(future(new SwInterfaceSetFlagsReply())).when(api).swInterfaceSetFlags(any(SwInterfaceSetFlags.class));
+    }
+
+    private SwInterfaceSetFlags verifySwInterfaceSetFlagsWasInvoked(final SwInterfaceSetFlags expected)
+            throws VppBaseCallException {
+        ArgumentCaptor<SwInterfaceSetFlags> argumentCaptor = ArgumentCaptor.forClass(SwInterfaceSetFlags.class);
+        verify(api).swInterfaceSetFlags(argumentCaptor.capture());
+        final SwInterfaceSetFlags actual = argumentCaptor.getValue();
+
+        assertEquals(expected.swIfIndex, actual.swIfIndex);
+        assertEquals(expected.adminUpDown, actual.adminUpDown);
+        return actual;
+    }
+
+    @Test
+    public void testCreateTwoTags() throws Exception {
+        final SubInterface subInterface = generateSubInterface(false, Arrays.asList(STAG_100, CTAG_200));
+        final InstanceIdentifier<SubInterface> id = getSubInterfaceId(SUPER_IF_NAME, SUBIF_INDEX);
+
+        whenCreateSubifThenSuccess();
+        whenSwInterfaceSetFlagsThenSuccess();
+
+        customizer.writeCurrentAttributes(id, subInterface, writeContext);
+
+        verify(api).createSubif(generateSubInterfaceRequest(SUPER_IF_ID, CTAG_ID, false));
+        verify(mappingContext)
+                .put(eq(mappingIid(SUB_IFACE_NAME, IFC_TEST_INSTANCE)), eq(
+                        mapping(SUB_IFACE_NAME, 0).get()));
+    }
+
+    @Test
+    public void testCreateDot1qAnyTag() throws Exception {
+        final SubInterface subInterface = generateSubInterface(false, Arrays.asList(STAG_100, CTAG_ANY));
+        final InstanceIdentifier<SubInterface> id = getSubInterfaceId(SUPER_IF_NAME, SUBIF_INDEX);
+
+        whenCreateSubifThenSuccess();
+        whenSwInterfaceSetFlagsThenSuccess();
+
+        customizer.writeCurrentAttributes(id, subInterface, writeContext);
+
+        verify(api).createSubif(generateSubInterfaceRequest(SUPER_IF_ID, CTAG_ANY_ID, true));
+        verify(mappingContext)
+                .put(eq(mappingIid(SUB_IFACE_NAME, IFC_TEST_INSTANCE)), eq(
+                        mapping(SUB_IFACE_NAME, 0).get()));
+    }
+
+    @Test
+    public void testCreateFailed() throws Exception {
+        final SubInterface subInterface = generateSubInterface(false, Arrays.asList(STAG_100, CTAG_200));
+        final InstanceIdentifier<SubInterface> id = getSubInterfaceId(SUPER_IF_NAME, SUBIF_INDEX);
+
+        whenCreateSubifThenFailure();
+
+        try {
+            customizer.writeCurrentAttributes(id, subInterface, writeContext);
+        } catch (WriteFailedException.CreateFailedException e) {
+            assertTrue(e.getCause() instanceof VppBaseCallException);
+            verify(api).createSubif(generateSubInterfaceRequest(SUPER_IF_ID, CTAG_ID, false));
+            verify(mappingContext, times(0)).put(
+                    eq(mappingIid(SUPER_IF_NAME, IFC_TEST_INSTANCE)),
+                    eq(mapping(SUPER_IF_NAME, 0).get()));
+            return;
+        }
+        fail("WriteFailedException.CreateFailedException was expected");
+    }
+
+    @Test
+    public void testUpdate() throws Exception {
+        final List<Tag> tags = Arrays.asList(STAG_100, CTAG_200);
+        final SubInterface before = generateSubInterface(false, tags);
+        final SubInterface after = generateSubInterface(true, tags);
+        final InstanceIdentifier<SubInterface> id = getSubInterfaceId(SUPER_IF_NAME, SUBIF_INDEX);
+
+        whenSwInterfaceSetFlagsThenSuccess();
+        customizer.updateCurrentAttributes(id, before, after, writeContext);
+
+        verifySwInterfaceSetFlagsWasInvoked(generateSwInterfaceEnableRequest(SUBIF_INDEX));
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public void testDelete() throws Exception {
+        final SubInterface subInterface = generateSubInterface(false, Arrays.asList(STAG_100, CTAG_200));
+        customizer.deleteCurrentAttributes(null, subInterface, writeContext);
+    }
+}