diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/AugmentTest.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/AugmentTest.java
new file mode 100644
index 0000000..8fd5580
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/AugmentTest.java
@@ -0,0 +1,528 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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 org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import static org.junit.Assert.assertNull;
+import static org.onosproject.yms.app.ydt.YdtAppNodeOperationType.BOTH;
+import static org.onosproject.yms.app.ydt.YdtAppNodeOperationType.DELETE_ONLY;
+import static org.onosproject.yms.app.ydt.YdtAppNodeOperationType.OTHER_EDIT;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A1;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A2;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A2L;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A3;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A4;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A5;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A5L;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A6;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A6L;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG1;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG2;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG3;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG4;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG5;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG6;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG7;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG8;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG9;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.IETF;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SLINK;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.STP;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.TOPONS;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.augmentNetworkYdt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateAppLogicalNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateAppModuleNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateAppNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafListContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.walkINTree;
+import static org.onosproject.yms.ydt.YdtContextOperationType.DELETE;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class AugmentTest {
+
+    private Set<String> valueSet = new HashSet();
+
+    private static final String[] EXPECTED = {
+            "Entry Node is yms-ietf-network.",
+            "Entry Node is yms-ietf-network.",
+            "Entry Node is networks.",
+            "Entry Node is network.",
+            "Entry Node is network-id.",
+            "Exit Node is network-id.",
+            "Entry Node is link.",
+            "Entry Node is link-id.",
+            "Exit Node is link-id.",
+            "Entry Node is source.",
+            "Entry Node is source-node.",
+            "Exit Node is source-node.",
+            "Entry Node is source-tp.",
+            "Exit Node is source-tp.",
+            "Exit Node is source.",
+
+            "Entry Node is destination.",
+            "Entry Node is dest-node.",
+            "Exit Node is dest-node.",
+            "Entry Node is dest-tp.",
+            "Exit Node is dest-tp.",
+            "Exit Node is destination.",
+
+            "Entry Node is supporting-link.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is link-ref.",
+            "Exit Node is link-ref.",
+            "Exit Node is supporting-link.",
+
+            "Entry Node is supporting-link.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is link-ref.",
+            "Exit Node is link-ref.",
+            "Exit Node is supporting-link.",
+
+            "Entry Node is augment1.",
+            "Entry Node is value1.",
+            "Exit Node is value1.",
+            "Exit Node is augment1.",
+
+            "Entry Node is augment2.",
+            "Entry Node is key1.",
+            "Exit Node is key1.",
+            "Entry Node is key2.",
+            "Exit Node is key2.",
+
+            "Entry Node is augment5.",
+
+            "Entry Node is augment6leafList.",
+            "Exit Node is augment6leafList.",
+
+            "Entry Node is value5.",
+            "Exit Node is value5.",
+            "Exit Node is augment5.",
+
+            "Entry Node is augment5leafList.",
+            "Exit Node is augment5leafList.",
+
+            "Entry Node is augment3.",
+
+            "Entry Node is augment4.",
+            "Entry Node is value4.",
+            "Exit Node is value4.",
+            "Exit Node is augment4.",
+
+            "Entry Node is augment5.",
+
+            "Entry Node is leaf6.",
+            "Exit Node is leaf6.",
+
+            "Entry Node is value5.",
+            "Exit Node is value5.",
+            "Exit Node is augment5.",
+
+            "Entry Node is augment6.",
+            "Entry Node is value6.",
+            "Exit Node is value6.",
+            "Exit Node is augment6.",
+
+            "Entry Node is value3.",
+            "Exit Node is value3.",
+            "Exit Node is augment3.",
+
+            "Entry Node is augment3leaf.",
+            "Exit Node is augment3leaf.",
+
+            "Exit Node is augment2.",
+
+            "Entry Node is augment2leafList.",
+            "Exit Node is augment2leafList.",
+
+            "Exit Node is link.",
+
+            "Entry Node is supporting-network.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Exit Node is supporting-network.",
+            "Entry Node is node.",
+            "Entry Node is node-id.",
+            "Exit Node is node-id.",
+            "Entry Node is t-point.",
+            "Entry Node is tp-id.",
+            "Exit Node is tp-id.",
+
+            "Entry Node is supporting-termination-point.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is node-ref.",
+            "Exit Node is node-ref.",
+            "Entry Node is tp-ref.",
+            "Exit Node is tp-ref.",
+
+            "Entry Node is augment1.",
+            "Entry Node is value1.",
+            "Exit Node is value1.",
+            "Exit Node is augment1.",
+
+            "Entry Node is augment1-leaf.",
+            "Exit Node is augment1-leaf.",
+
+            "Entry Node is augment2.",
+
+            "Entry Node is augment3.",
+            "Entry Node is value3.",
+            "Exit Node is value3.",
+            "Exit Node is augment3.",
+
+            "Entry Node is augment4leaf.",
+            "Exit Node is augment4leaf.",
+
+            "Entry Node is value2.",
+            "Exit Node is value2.",
+            "Exit Node is augment2.",
+            "Entry Node is augment2leafList.",
+            "Exit Node is augment2leafList.",
+            "Entry Node is augment2leaf.",
+            "Exit Node is augment2leaf.",
+
+            "Exit Node is supporting-termination-point.",
+            "Exit Node is t-point.",
+            "Entry Node is supporting-node.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is node-ref.",
+            "Exit Node is node-ref.",
+            "Exit Node is supporting-node.",
+
+            "Exit Node is node.",
+            // last augmented sibling in network
+            "Entry Node is link-id.",
+            "Exit Node is link-id.",
+
+            "Exit Node is network.",
+            "Exit Node is networks.",
+            "Entry Node is networks-state.",
+            "Entry Node is network.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is server-provided.",
+            "Exit Node is server-provided.",
+            "Exit Node is network.",
+            "Exit Node is networks-state.",
+            "Exit Node is yms-ietf-network.",
+            "Exit Node is yms-ietf-network."
+    };
+
+    /**
+     * Creates and validates ietf network augment ydt.
+     */
+    @Test
+    public void augmentTest() {
+        YangRequestWorkBench ydtBuilder = augmentNetworkYdt();
+        validateTree(ydtBuilder);
+        validateAppTree(ydtBuilder);
+        walkINTree(ydtBuilder, EXPECTED);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+
+        // Assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, "yms-ietf-network", null);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "yms-ietf-network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "networks", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-id", "network1");
+        ydtNode = ydtNode.getNextSibling();
+
+        // Validating augmented child
+        validateNodeContents(ydtNode, "link", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "link-id", "id1");
+        ydtNode = ydtNode.getNextSibling();
+
+        // Inside source node
+        validateNodeContents(ydtNode, "source", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "source-node", "source1");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "source-tp", "source2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        //Inside destination node
+        validateNodeContents(ydtNode, "destination", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "dest-node", "dest1");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "dest-tp", "dest2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        //Inside supporting links
+        validateNodeContents(ydtNode, SLINK, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network1");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "link-ref", "id2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        //Inside another supporting links instance
+        validateNodeContents(ydtNode, SLINK, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network2");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "link-ref", "id3");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        validateNodeContents(ydtNode, "augment1", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "value1", "1");
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "augment2", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "key1", "1");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "key2", "2");
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "augment5", DELETE);
+        ydtNode = ydtNode.getFirstChild();
+        valueSet.add("1");
+        valueSet.add("2");
+        validateLeafListContents(ydtNode, A6L, valueSet);
+        ydtNode = ydtNode.getNextSibling();
+
+        validateLeafContents(ydtNode, "value5", "5");
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafListContents(ydtNode, A5L, valueSet);
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "augment3", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+
+        validateNodeContents(ydtNode, "augment4", DELETE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "value4", "4");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        validateNodeContents(ydtNode, "augment5", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+
+        validateLeafContents(ydtNode, "leaf6", "6");
+        ydtNode = ydtNode.getNextSibling();
+
+        validateLeafContents(ydtNode, "value5", "5");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        validateNodeContents(ydtNode, "augment6", DELETE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "value6", "6");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        validateLeafContents(ydtNode, "value3", "3");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "augment3leaf", "3");
+
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafListContents(ydtNode, A2L, valueSet);
+
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "supporting-network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network2");
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "node", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "node-id", "node1");
+        ydtNode = ydtNode.getNextSibling();
+
+        //Inside termination-point
+        validateNodeContents(ydtNode, "t-point", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "tp-id", "tp_id1");
+        ydtNode = ydtNode.getNextSibling();
+
+        validateTerminationPointAugment(ydtNode);
+    }
+
+    /**
+     * Validates the termination point node in given built ydt.
+     */
+    private void validateTerminationPointAugment(YdtNode ydtNode) {
+
+        //Inside supporting-termination-point
+        validateNodeContents(ydtNode, STP, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network-ref");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "node-ref", "node-ref");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "tp-ref", "tp-ref");
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "augment1", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "value1", "1");
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "augment1-leaf", "1");
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "augment2", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+
+        validateNodeContents(ydtNode, "augment3", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "value3", "3");
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "augment4leaf", "4");
+
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "value2", "2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafListContents(ydtNode, A2L, valueSet);
+
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "augment2leaf", "2");
+
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "supporting-node", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network3");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "node-ref", "network4");
+
+        ydtNode = ydtNode.getParent().getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "link-id", "id1");
+        ydtNode = ydtNode.getParent().getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "networks-state", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network5");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "server-provided", "true");
+    }
+
+    /**
+     * Validates the given built ydt application tree.
+     */
+    private void validateAppTree(YangRequestWorkBench ydtBuilder) {
+
+        // Assign root node to ydtNode for validating purpose.
+        YdtAppContext ydtAppContext = ydtBuilder.getAppRootNode();
+        // Logical root node does not have operation type
+        validateAppLogicalNodeContents(ydtAppContext);
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppModuleNodeContents(ydtAppContext, IETF, BOTH);
+        ydtAppContext = ydtAppContext.getFirstChild();
+
+        //Inside link node
+        validateAppNodeContents(ydtAppContext, AUG1, TOPONS, BOTH);
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppNodeContents(ydtAppContext, AUG3, A1, OTHER_EDIT);
+        assertNull(ydtAppContext.getFirstChild());
+        assertNull(ydtAppContext.getPreviousSibling());
+        ydtAppContext = ydtAppContext.getNextSibling();
+        validateAppNodeContents(ydtAppContext, AUG3, A2, BOTH);
+
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppNodeContents(ydtAppContext, AUG5, A5, DELETE_ONLY);
+
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppNodeContents(ydtAppContext, AUG9, A6, DELETE_ONLY);
+        ydtAppContext = ydtAppContext.getParent();
+
+        ydtAppContext = ydtAppContext.getNextSibling();
+        validateAppNodeContents(ydtAppContext, AUG5, A3, BOTH);
+
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppNodeContents(ydtAppContext, AUG7, A4, DELETE_ONLY);
+
+        ydtAppContext = ydtAppContext.getNextSibling();
+        validateAppNodeContents(ydtAppContext, AUG7, A5, OTHER_EDIT);
+
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppNodeContents(ydtAppContext, AUG8, A6, OTHER_EDIT);
+        ydtAppContext = ydtAppContext.getParent();
+
+        ydtAppContext = ydtAppContext.getNextSibling();
+        validateAppNodeContents(ydtAppContext, AUG7, A6, DELETE_ONLY);
+
+        ydtAppContext = ydtAppContext.getParent();
+        ydtAppContext = ydtAppContext.getParent();
+        ydtAppContext = ydtAppContext.getParent();
+
+        ydtAppContext = ydtAppContext.getNextSibling();
+
+        validateAppNodeContents(ydtAppContext, AUG2, TOPONS, OTHER_EDIT);
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppNodeContents(ydtAppContext, AUG4, A1, OTHER_EDIT);
+        assertNull(ydtAppContext.getFirstChild());
+        assertNull(ydtAppContext.getPreviousSibling());
+        ydtAppContext = ydtAppContext.getNextSibling();
+        validateAppNodeContents(ydtAppContext, AUG4, A2, OTHER_EDIT);
+        assertNull(ydtAppContext.getNextSibling());
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppNodeContents(ydtAppContext, AUG6, A3, OTHER_EDIT);
+
+        ydtAppContext = ydtAppContext.getNextSibling();
+        validateAppNodeContents(ydtAppContext, AUG6, A4, OTHER_EDIT);
+        assertNull(ydtAppContext.getFirstChild());
+        assertNull(ydtAppContext.getNextSibling());
+    }
+}