diff --git a/apps/yms/ut/src/test/java/org/onosproject/yms/app/ysr/DefaultYangSchemaRegistryTest.java b/apps/yms/ut/src/test/java/org/onosproject/yms/app/ysr/DefaultYangSchemaRegistryTest.java
new file mode 100644
index 0000000..bf8d46a
--- /dev/null
+++ b/apps/yms/ut/src/test/java/org/onosproject/yms/app/ysr/DefaultYangSchemaRegistryTest.java
@@ -0,0 +1,677 @@
+/*
+ * 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.ysr;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.network1.rev20151208.IetfNetwork1Service;
+import org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.network2.rev20151208.IetfNetwork2Service;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangSchemaNode;
+
+import java.io.IOException;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Unit test case for default schema registry.
+ */
+public class DefaultYangSchemaRegistryTest {
+
+    private static final String SERVICE_NAME_1 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network1.rev20151208.IetfNetwork1Service";
+    private static final String SCHEMA_NAME_1 = "ietf-network1";
+    private static final String EVENT_NAME_1 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network1.rev20151208.ietfnetwork1.IetfNetwork1Event";
+    private static final String INTERFACE_NAME_1 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network1.rev20151208.IetfNetwork1";
+    private static final String OP_PARAM_NAME_1 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network1.rev20151208.IetfNetwork1OpParam";
+
+    private static final String SERVICE_NAME_2 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network2.rev20151208.IetfNetwork2Service";
+    private static final String SCHEMA_NAME_2 = "ietf-network2";
+    private static final String EVENT_NAME_2 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network2.rev20151208.ietfnetwork2.IetfNetwork2Event";
+    private static final String INTERFACE_NAME_2 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network2.rev20151208.IetfNetwork2";
+    private static final String OP_PARAM_NAME_2 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network2.rev20151208.IetfNetwork2OpParam";
+
+    private static final String SERVICE_NAME_3 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network3.rev20151208.IetfNetwork3Service";
+    private static final String SCHEMA_NAME_3 = "ietf-network3";
+    private static final String EVENT_NAME_3 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network3.rev20151208.ietfnetwork3.IetfNetwork3Event";
+    private static final String INTERFACE_NAME_3 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network3.rev20151208.IetfNetwork3";
+    private static final String OP_PARAM_NAME_3 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network3.rev20151208.IetfNetwork3OpParam";
+
+    private static final String SCHEMA_NAME_4_14 = "ietf-network4@2014-00-08";
+    private static final String SCHEMA_NAME_4_15 = "ietf-network4@2015-00-08";
+    private static final String SCHEMA_NAME_4_16 = "ietf-network4@2016-00-08";
+    private static final String SCHEMA_NAME_4_17 = "ietf-network4@2017-00-08";
+    private static final String SCHEMA_NAME_4 = "ietf-network4";
+    private static final String SERVICE_NAME_REV_14 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20141208.IetfNetwork4Service";
+    private static final String EVENT_NAME_REV_14 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20141208.ietfnetwork4.IetfNetwork4Event";
+    private static final String INTERFACE_NAME_REV_14 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20141208.IetfNetwork4";
+    private static final String OP_PARAM_NAME_REV_14 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20141208.IetfNetwork4OpParam";
+
+    private static final String SERVICE_NAME_REV_15 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20151208.IetfNetwork4Service";
+    private static final String EVENT_NAME_REV_15 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20151208.ietfnetwork4.IetfNetwork4Event";
+    private static final String INTERFACE_NAME_REV_15 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20151208.IetfNetwork4";
+    private static final String OP_PARAM_NAME_REV_15 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20151208.IetfNetwork4OpParam";
+
+    private static final String SERVICE_NAME_REV_16 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20161208.IetfNetwork4Service";
+
+    private static final String EVENT_NAME_REV_16 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20161208.ietfnetwork4.IetfNetwork4Event";
+    private static final String INTERFACE_NAME_REV_16 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20161208.IetfNetwork4";
+    private static final String OP_PARAM_NAME_REV_16 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20161208.IetfNetwork4OpParam";
+
+    private static final String SERVICE_NAME_REV_17 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20171208.IetfNetwork4Service";
+    private static final String EVENT_NAME_REV_17 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20171208.ietfnetwork4.IetfNetwork4Event";
+    private static final String INTERFACE_NAME_REV_17 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20171208.IetfNetwork4";
+    private static final String OP_PARAM_NAME_REV_17 =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.rev20171208.IetfNetwork4OpParam";
+
+    private static final String SERVICE_NAME_NO_REV =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.IetfNetwork4Service";
+    private static final String EVENT_NAME_NO_REV =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.ietfnetwork4.IetfNetwork4Event";
+    private static final String INTERFACE_NAME_NO_REV =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.IetfNetwork4";
+    private static final String OP_PARAM_NAME_NO_REV =
+            "org.onosproject.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf" +
+                    ".network4.IetfNetwork4OpParam";
+
+    private static final String DATE = "2014-00-08";
+    private static final String SCHEMA_NAME_WITH_DATE =
+            "ietf-network4@2014-00-08";
+
+    private static final String UN_REG_SCHEMA_NAME = "ietf-routing";
+    private static final String UN_REG_INTERFACE_NAME = "IetfRouting";
+    private static final String UN_REG_OP_PARAM_NAME = "IetfRoutingOpParam";
+    private static final String UN_REG_SERVICE_NAME = "IetfRoutingService";
+    private static final String UN_REG_EVENT_NAME = "IetfRoutingEvent";
+
+    private final TestYangSchemaNodeProvider testYangSchemaNodeProvider =
+            new TestYangSchemaNodeProvider();
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * Unit test case in which schema node should be present.
+     *
+     * @throws IOException when fails to do IO operation
+     */
+    @Test
+    public void testForGetSchemaNode()
+            throws IOException {
+
+        testYangSchemaNodeProvider.processSchemaRegistry(null);
+
+        DefaultYangSchemaRegistry registry =
+                testYangSchemaNodeProvider.getDefaultYangSchemaRegistry();
+
+        YangSchemaNode yangNode =
+                registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_1);
+        assertThat(true, is(SCHEMA_NAME_1.equals(yangNode.getName())));
+
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_1);
+        assertThat(true, is(SCHEMA_NAME_1.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeInterfaceFileName(
+                        INTERFACE_NAME_1);
+        assertThat(true, is(SCHEMA_NAME_1.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeOpPramFileName(
+                        OP_PARAM_NAME_1);
+        assertThat(true, is(SCHEMA_NAME_1.equals(yangNode.getName())));
+
+        yangNode = registry.getRootYangSchemaNodeForNotification(EVENT_NAME_1);
+        assertThat(true, is(SCHEMA_NAME_1.equals(yangNode.getName())));
+
+        //As we have not registered an  application this object should be null.
+        Object object = registry.getRegisteredApplication(yangNode);
+        assertThat(true, is(object == null));
+        testYangSchemaNodeProvider.unregisterService(SERVICE_NAME_1);
+
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_1);
+        assertThat(true, is(yangNode == null));
+
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_1);
+        assertThat(true, is(yangNode == null));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeInterfaceFileName(
+                        INTERFACE_NAME_1);
+        assertThat(true, is(yangNode == null));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeOpPramFileName(
+                        OP_PARAM_NAME_1);
+        assertThat(true, is(yangNode == null));
+
+        yangNode = registry.getRootYangSchemaNodeForNotification(EVENT_NAME_1);
+        assertThat(true, is(yangNode == null));
+
+        //As we have not registered an  application this object should be null.
+        object = registry.getRegisteredApplication(yangNode);
+        assertThat(true, is(object == null));
+
+        //With second service.
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_2);
+        assertThat(true, is(SCHEMA_NAME_2.equals(yangNode.getName())));
+
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_2);
+        assertThat(true, is(SCHEMA_NAME_2.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeInterfaceFileName(
+                        INTERFACE_NAME_2);
+        assertThat(true, is(SCHEMA_NAME_2.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeOpPramFileName(
+                        OP_PARAM_NAME_2);
+        assertThat(true, is(SCHEMA_NAME_2.equals(yangNode.getName())));
+
+        yangNode = registry.getRootYangSchemaNodeForNotification(EVENT_NAME_2);
+        assertThat(true, is(SCHEMA_NAME_2.equals(yangNode.getName())));
+
+        //As we have not registered an  application this object should be null.
+        object = registry.getRegisteredApplication(yangNode);
+        assertThat(true, is(object == null));
+
+        testYangSchemaNodeProvider.unregisterService(SERVICE_NAME_2);
+
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_2);
+        assertThat(true, is(yangNode == null));
+
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_2);
+        assertThat(true, is(yangNode == null));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeInterfaceFileName(
+                        INTERFACE_NAME_2);
+        assertThat(true, is(yangNode == null));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeOpPramFileName(
+                        OP_PARAM_NAME_2);
+        assertThat(true, is(yangNode == null));
+
+        yangNode = registry.getRootYangSchemaNodeForNotification(EVENT_NAME_2);
+        assertThat(true, is(yangNode == null));
+
+        //As we have not registered an  application this object should be null.
+        object = registry.getRegisteredApplication(yangNode);
+        assertThat(true, is(object == null));
+
+        //With third service.
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_3);
+        assertThat(true, is(SCHEMA_NAME_3.equals(yangNode.getName())));
+
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_3);
+        assertThat(true, is(SCHEMA_NAME_3.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeInterfaceFileName(
+                        INTERFACE_NAME_3);
+        assertThat(true, is(SCHEMA_NAME_3.equals(yangNode.getName())));
+
+        yangNode = registry.getRootYangSchemaNodeForNotification(EVENT_NAME_3);
+        assertThat(true, is(yangNode == null));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeOpPramFileName(
+                        OP_PARAM_NAME_3);
+        assertThat(true, is(SCHEMA_NAME_3.equals(yangNode.getName())));
+
+        //As we have not registered an  application this object should be null.
+        object = registry.getRegisteredApplication(yangNode);
+        assertThat(true, is(object == null));
+
+        testYangSchemaNodeProvider.unregisterService(SERVICE_NAME_3);
+
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_3);
+        assertThat(true, is(yangNode == null));
+
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_3);
+        assertThat(true, is(yangNode == null));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeInterfaceFileName(
+                        INTERFACE_NAME_3);
+        assertThat(true, is(yangNode == null));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeOpPramFileName(
+                        OP_PARAM_NAME_3);
+        assertThat(true, is(yangNode == null));
+
+        yangNode = registry.getRootYangSchemaNodeForNotification(EVENT_NAME_3);
+        assertThat(true, is(yangNode == null));
+
+        //As we have not registered an  application this object should be null.
+        object = registry.getRegisteredApplication(yangNode);
+        assertThat(true, is(object == null));
+    }
+
+    /**
+     * Unit test case in which schema node should not be present.
+     *
+     * @throws IOException when fails to do IO operation
+     */
+    @Test
+    public void testForDoNotGetSchemaNode()
+            throws IOException {
+
+        DefaultYangSchemaRegistry registry =
+                testYangSchemaNodeProvider.getDefaultYangSchemaRegistry();
+
+        // here all nodes should be null as we have not done any registration
+        // for this application.
+        YangSchemaNode yangNode =
+                registry.getYangSchemaNodeUsingAppName(UN_REG_SERVICE_NAME);
+        assertThat(true, is(yangNode == null));
+
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(UN_REG_SCHEMA_NAME);
+        assertThat(true, is(yangNode == null));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeInterfaceFileName(
+                        UN_REG_INTERFACE_NAME);
+        assertThat(true, is(yangNode == null));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeOpPramFileName(
+                        UN_REG_OP_PARAM_NAME);
+        assertThat(true, is(yangNode == null));
+
+        yangNode = registry.getRootYangSchemaNodeForNotification(
+                UN_REG_EVENT_NAME);
+        assertThat(true, is(yangNode == null));
+
+        //As we have not registered an  application this object should be null.
+        Object object = registry.getRegisteredApplication(yangNode);
+        assertThat(true, is(object == null));
+    }
+
+    /**
+     * Unit test case in which schema node should be present with multi
+     * revisions.
+     *
+     * @throws IOException when fails to do IO operation
+     */
+    @Test
+    public void testForGetSchemaNodeWhenNoRevision()
+            throws IOException {
+
+        testYangSchemaNodeProvider.processSchemaRegistry(null);
+        DefaultYangSchemaRegistry registry =
+                testYangSchemaNodeProvider.getDefaultYangSchemaRegistry();
+
+        //Service with rev.
+        YangSchemaNode yangNode =
+                registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_REV_15);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_4_15);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeInterfaceFileName(
+                        INTERFACE_NAME_REV_15);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeOpPramFileName(
+                        OP_PARAM_NAME_REV_15);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode = registry.getRootYangSchemaNodeForNotification(
+                EVENT_NAME_REV_15);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        //As we have not registered an  application this object should be null.
+        Object object = registry.getRegisteredApplication(yangNode);
+        assertThat(true, is(object == null));
+        testYangSchemaNodeProvider.unregisterService(SERVICE_NAME_REV_15);
+
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_REV_15);
+        assertThat(true, is(yangNode == null));
+
+        //Here the yangNode should be the node which does not have revision.
+        // asset should pass with false.
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_4);
+        assertThat(true, is(((YangNode) yangNode).getRevision() == null));
+
+        //Service no revision.
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_NO_REV);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_4);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeInterfaceFileName(
+                        INTERFACE_NAME_NO_REV);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeOpPramFileName(
+                        OP_PARAM_NAME_NO_REV);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode = registry.getRootYangSchemaNodeForNotification(EVENT_NAME_NO_REV);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        //As we have not registered an  application this object should be null.
+        object = registry.getRegisteredApplication(yangNode);
+        assertThat(true, is(object == null));
+        testYangSchemaNodeProvider.unregisterService(SERVICE_NAME_NO_REV);
+
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_NO_REV);
+        assertThat(true, is(yangNode == null));
+
+        //Here the yangNode should be the node which have different revision.
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_4);
+        assertThat(true, is(yangNode != null));
+        assertThat(true, is(((YangNode) yangNode).getRevision() != null));
+    }
+
+    /**
+     * Unit test case in which schema node should be present with multi
+     * revisions.
+     *
+     * @throws IOException when fails to do IO operation
+     */
+    @Test
+    public void testForGetSchemaNodeWhenMultiRevision()
+            throws IOException {
+
+        testYangSchemaNodeProvider.processSchemaRegistry(null);
+        DefaultYangSchemaRegistry registry =
+                testYangSchemaNodeProvider.getDefaultYangSchemaRegistry();
+
+        //Service with rev.
+        YangSchemaNode yangNode =
+                registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_REV_15);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_4_15);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeInterfaceFileName(
+                        INTERFACE_NAME_REV_15);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeOpPramFileName(
+                        OP_PARAM_NAME_REV_15);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode = registry.getRootYangSchemaNodeForNotification(
+                EVENT_NAME_REV_15);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        //As we have not registered an  application this object should be null.
+        Object object = registry.getRegisteredApplication(yangNode);
+        assertThat(true, is(object == null));
+        testYangSchemaNodeProvider.unregisterService(SERVICE_NAME_REV_15);
+
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_REV_15);
+        assertThat(true, is(yangNode == null));
+
+        //Here the yangNode should be the node which does not have revision.
+        // asset should pass with false.
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_4);
+        assertThat(true, is(((YangNode) yangNode).getRevision() == null));
+
+        //Service with different revision.
+        yangNode = registry
+                .getYangSchemaNodeUsingAppName(SERVICE_NAME_REV_16);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_4_16);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeInterfaceFileName(
+                        INTERFACE_NAME_REV_16);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeOpPramFileName(
+                        OP_PARAM_NAME_REV_16);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode = registry.getRootYangSchemaNodeForNotification(EVENT_NAME_REV_16);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        //As we have not registered an  application this object should be null.
+        object = registry.getRegisteredApplication(yangNode);
+        assertThat(true, is(object == null));
+        testYangSchemaNodeProvider.unregisterService(SERVICE_NAME_REV_16);
+
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_REV_16);
+        assertThat(true, is(yangNode == null));
+
+        //Here the yangNode should be the node which have different revision.
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_4);
+        assertThat(true, is(((YangNode) yangNode).getRevision() == null));
+
+        //Service with different revision.
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_REV_17);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_4_17);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeInterfaceFileName(
+                        INTERFACE_NAME_REV_17);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeOpPramFileName(
+                        OP_PARAM_NAME_REV_17);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode = registry.getRootYangSchemaNodeForNotification(
+                EVENT_NAME_REV_17);
+        assertThat(true, is(yangNode == null));
+
+        //As we have not registered an  application this object should be null.
+        object = registry.getRegisteredApplication(yangNode);
+        assertThat(true, is(object == null));
+        testYangSchemaNodeProvider.unregisterService(SERVICE_NAME_REV_17);
+
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_REV_17);
+        assertThat(true, is(yangNode == null));
+
+        //Here the yangNode should be the node which have different revision.
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_4);
+        assertThat(true, is(((YangNode) yangNode).getRevision() == null));
+
+        //Service no revision.
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_NO_REV);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_4);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeInterfaceFileName(
+                        INTERFACE_NAME_NO_REV);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeOpPramFileName(
+                        OP_PARAM_NAME_NO_REV);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode = registry.getRootYangSchemaNodeForNotification(EVENT_NAME_NO_REV);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        //As we have not registered an  application this object should be null.
+        object = registry.getRegisteredApplication(yangNode);
+        assertThat(true, is(object == null));
+        testYangSchemaNodeProvider.unregisterService(SERVICE_NAME_NO_REV);
+
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_NO_REV);
+        assertThat(true, is(yangNode == null));
+
+        //Here the yangNode should be the node which have different revision.
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_4);
+        assertThat(true, is(yangNode != null));
+        assertThat(true, is(((YangNode) yangNode).getRevision() != null));
+
+        //Service with different revision.
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_REV_14);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode = registry.getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_4_14);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeInterfaceFileName(
+                        INTERFACE_NAME_REV_14);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode =
+                registry.getYangSchemaNodeUsingGeneratedRootNodeOpPramFileName(
+                        OP_PARAM_NAME_REV_14);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        yangNode = registry.getRootYangSchemaNodeForNotification(
+                EVENT_NAME_REV_14);
+        assertThat(true, is(SCHEMA_NAME_4.equals(yangNode.getName())));
+
+        //As we have not registered an  application this object should be null.
+        object = registry.getRegisteredApplication(yangNode);
+        assertThat(true, is(object == null));
+        testYangSchemaNodeProvider.unregisterService(SERVICE_NAME_REV_14);
+
+        yangNode = registry.getYangSchemaNodeUsingAppName(SERVICE_NAME_REV_14);
+        assertThat(true, is(yangNode == null));
+    }
+
+    /**
+     * Unit test case should generate exceptions.
+     */
+    @Test
+    public void testRegistration() {
+        thrown.expect(RuntimeException.class);
+        testYangSchemaNodeProvider.processSchemaRegistry(null);
+        testYangSchemaNodeProvider.processRegistrationOfApp();
+    }
+
+    /**
+     * Unit test case should not generate any exceptions and should
+     * return specific revision node.
+     */
+    @Test
+    public void testGetWithSpecificRevision() {
+        testYangSchemaNodeProvider.processSchemaRegistry(null);
+        YangSchemaNode schemaNode = testYangSchemaNodeProvider
+                .getDefaultYangSchemaRegistry()
+                .getYangSchemaNodeUsingSchemaName(SCHEMA_NAME_WITH_DATE);
+
+        assertThat(true, is(schemaNode.getName().equals(SCHEMA_NAME_4)));
+        String date = testYangSchemaNodeProvider
+                .getDefaultYangSchemaRegistry()
+                .getDateInStringFormat(schemaNode);
+        assertThat(true, is(date.equals(DATE)));
+    }
+
+    /**
+     * Unit test case should not generate any exceptions
+     * verify notification should be checked for registration.
+     */
+    @Test
+    public void testNotification() {
+        MockIetfManager manager = new MockIetfManager();
+        testYangSchemaNodeProvider.processSchemaRegistry(manager);
+        boolean isRegWithNotification =
+                testYangSchemaNodeProvider.getDefaultYangSchemaRegistry()
+                        .verifyNotificationObject(manager, IetfNetwork1Service.class);
+        assertThat(true, is(isRegWithNotification));
+        isRegWithNotification = testYangSchemaNodeProvider
+                .getDefaultYangSchemaRegistry()
+                .verifyNotificationObject(manager, IetfNetwork2Service.class);
+        assertThat(false, is(isRegWithNotification));
+        //TODO fix with YAB
+//        isRegWithNotification = testYangSchemaNodeProvider
+//                .getDefaultYangSchemaRegistry()
+//                .verifyNotificationObject(new TestManager(), TestService.class);
+//        assertThat(false, is(isRegWithNotification));
+    }
+}
\ No newline at end of file