[ONOS-4753] Identity/identityref implementation and UT

Change-Id: I40148fa228465555be3bdf410cc294ffc0f34c18
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/IdentityListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/IdentityListenerTest.java
new file mode 100644
index 0000000..b0ae937
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/IdentityListenerTest.java
@@ -0,0 +1,220 @@
+/*
+ * 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.yangutils.parser.impl.listeners;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangIdentity;
+import org.onosproject.yangutils.datamodel.YangIdentityRef;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.utils.ResolvableStatus;
+import org.onosproject.yangutils.datamodel.utils.builtindatatype.YangDataTypes;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+import java.util.ListIterator;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test case for identity listener.
+ */
+public class IdentityListenerTest {
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks for updating datamodel for identity/identityref.
+     */
+    @Test
+    public void processIdentityrefType() throws IOException, ParserException {
+
+        YangNode node = manager
+                .getDataModel("src/test/resources/IdentityListener.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("IdentityListener"));
+
+        YangIdentity yangIdentity = (YangIdentity) yangNode.getChild();
+        assertThat(yangIdentity.getName(), is("tunnel"));
+
+        yangIdentity = (YangIdentity) yangNode.getChild().getNextSibling();
+        assertThat(yangIdentity.getName(), is("tunnel-type"));
+
+        yangIdentity = (YangIdentity) yangNode.getChild().getNextSibling().getNextSibling();
+        assertThat(yangIdentity.getName(), is("ref-address-family"));
+
+        yangIdentity = (YangIdentity) yangNode.getChild().getNextSibling().getNextSibling()
+                .getNextSibling();
+        assertThat(yangIdentity.getName(), is("ipv4-address-family"));
+        assertThat(yangIdentity.getBaseNode().getBaseIdentifier().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getReferredIdentity().getName(), is("ref-address-family"));
+
+        yangIdentity = (YangIdentity) yangNode.getChild().getNextSibling().getNextSibling()
+                .getNextSibling().getNextSibling();
+        assertThat(yangIdentity.getName(), is("ipv6-address-family"));
+        assertThat(yangIdentity.getBaseNode().getBaseIdentifier().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("tunnel"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("identityref"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.IDENTITYREF));
+        YangIdentityRef yangIdentityRef = (YangIdentityRef) leafInfo.getDataType().getDataTypeExtendedInfo();
+        assertThat(yangIdentityRef.getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getBaseIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        // Check whether the information in the leaf is correct.
+        assertThat(leafListInfo.getName(), is("network-ref"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("identityref"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.IDENTITYREF));
+        yangIdentityRef = (YangIdentityRef) (leafListInfo.getDataType().getDataTypeExtendedInfo());
+
+        // Check whether identityref type got resolved.
+        assertThat(yangIdentityRef.getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+    }
+
+    /**
+     * Checks for updating datamodel for intrafile resolution identity/identityref.
+     */
+    @Test
+    public void processIntraIdentityrefType() throws IOException, ParserException {
+
+        YangNode node = manager
+                .getDataModel("src/test/resources/IdentityIntraFile.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("IdentityIntraFile"));
+
+        YangIdentity yangIdentity = (YangIdentity) yangNode.getChild();
+        assertThat(yangIdentity.getName(), is("ipv4-address-family"));
+        assertThat(yangIdentity.getBaseNode().getBaseIdentifier().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getResolvableStatus(), is(ResolvableStatus.INTRA_FILE_RESOLVED));
+    }
+
+    /**
+     * Checks for updating datamodel for identityref used in tydedef.
+     */
+    @Test
+    public void processIdentityTypedefStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/IdentityTypedef.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangIdentity yangIdentity = (YangIdentity) yangNode.getChild();
+        assertThat(yangIdentity.getName(), is("tunnel"));
+
+        YangTypeDef typedef = (YangTypeDef) yangNode.getChild().getNextSibling();
+        assertThat(typedef.getName(), is("type15"));
+
+        YangType type = typedef.getTypeList().iterator().next();
+        assertThat(type.getDataType(), is(YangDataTypes.IDENTITYREF));
+        assertThat(type.getDataTypeName(), is("identityref"));
+
+        YangIdentityRef identityRef = (YangIdentityRef) type.getDataTypeExtendedInfo();
+        assertThat(identityRef.getName(), is("tunnel"));
+        assertThat(identityRef.getBaseIdentity().getName(), is("tunnel"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("tunnel-value"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("identityref"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.IDENTITYREF));
+        YangIdentityRef yangIdentityRef = (YangIdentityRef) leafInfo.getDataType().getDataTypeExtendedInfo();
+        assertThat(yangIdentityRef.getName(), is("tunnel"));
+        assertThat(yangIdentityRef.getBaseIdentity().getName(), is("tunnel"));
+        assertThat(yangIdentityRef.getReferredIdentity().getName(), is("tunnel"));
+        assertThat(yangIdentityRef.getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+   }
+
+    /**
+     * Checks for updating datamodel for unresolved status of identityref used in tydedef.
+     */
+    @Test
+    public void processIdentityUnresolvedTypedefStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/IdentityTypedefUnresolved.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangIdentity yangIdentity = (YangIdentity) yangNode.getChild();
+        assertThat(yangIdentity.getName(), is("tunnel"));
+
+        YangTypeDef typedef = (YangTypeDef) yangNode.getChild().getNextSibling();
+        assertThat(typedef.getName(), is("type15"));
+
+        YangType type = typedef.getTypeList().iterator().next();
+        assertThat(type.getDataType(), is(YangDataTypes.IDENTITYREF));
+        assertThat(type.getDataTypeName(), is("identityref"));
+
+        YangIdentityRef identityRef = (YangIdentityRef) type.getDataTypeExtendedInfo();
+        assertThat(identityRef.getName(), is("tunnel"));
+        assertThat(identityRef.getBaseIdentity().getName(), is("tunnel"));
+        assertThat(identityRef.getResolvableStatus(), is(ResolvableStatus.UNRESOLVED));
+
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/TypeListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/TypeListenerTest.java
index 8891108..b6b497a 100644
--- a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/TypeListenerTest.java
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/TypeListenerTest.java
@@ -122,20 +122,6 @@
     }
 
     /**
-     * Checks for unsupported type identityref.
-     */
-    @Test
-    public void processIdentityrefType() throws IOException, ParserException {
-
-        thrown.expect(ParserException.class);
-        thrown.expectMessage("YANG file error : \"identityref\" is not supported in current version,"
-                + " please check wiki for YANG utils road map.");
-
-        YangNode node = manager
-                .getDataModel("src/test/resources/IdentityrefInvalidIdentifier.yang");
-    }
-
-    /**
      * Checks for type instance-identifier.
      */
     @Test
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/plugin/manager/InterFileIdentityLinkingTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/plugin/manager/InterFileIdentityLinkingTest.java
new file mode 100644
index 0000000..7805bf0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/plugin/manager/InterFileIdentityLinkingTest.java
@@ -0,0 +1,642 @@
+/*
+ * 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.yangutils.plugin.manager;
+
+import org.apache.maven.plugin.MojoExecutionException;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangIdentity;
+import org.onosproject.yangutils.datamodel.YangIdentityRef;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.utils.ResolvableStatus;
+import org.onosproject.yangutils.datamodel.utils.builtindatatype.YangDataTypes;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.linker.impl.YangLinkerManager;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.utils.io.impl.YangFileScanner;
+
+import java.io.IOException;
+import java.util.ListIterator;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import static org.onosproject.yangutils.datamodel.YangNodeType.MODULE_NODE;
+
+/**
+ * Test cases for testing inter file linking for identity.
+ */
+public class InterFileIdentityLinkingTest {
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilManager utilManager = new YangUtilManager();
+    private final YangLinkerManager yangLinkerManager = new YangLinkerManager();
+
+    /**
+     * Checks inter file feature linking with imported file.
+     */
+    @Test
+    public void processIdentityInImportedFile()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfileidentityimport";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.createYangNodeSet();
+
+        YangNode selfNode = null;
+        YangNode refNode1 = null;
+        YangNode refNode2 = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangNodeSet());
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangNodeSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangNodeSet());
+
+        for (YangNode rootNode : utilManager.getYangNodeSet()) {
+            if (rootNode.getName().equals("IdentityIntraFile")) {
+                selfNode = rootNode;
+            } else if (rootNode.getName().equals("IdentityInModule")) {
+                refNode1 = rootNode;
+            } else {
+                refNode2 = rootNode;
+            }
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("IdentityIntraFile"));
+
+        YangIdentity yangIdentity = (YangIdentity) yangNode.getChild();
+        assertThat(yangIdentity.getName(), is("ipv4-address-family"));
+        assertThat(yangIdentity.getBaseNode().getBaseIdentifier().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        yangIdentity = (YangIdentity) yangNode.getChild().getNextSibling();
+        assertThat(yangIdentity.getName(), is("ipv6-address-family"));
+        assertThat(yangIdentity.getBaseNode().getBaseIdentifier().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("tunnel"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("identityref"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.IDENTITYREF));
+        YangIdentityRef yangIdentityRef = (YangIdentityRef) leafInfo.getDataType().getDataTypeExtendedInfo();
+        assertThat(yangIdentityRef.getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getBaseIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        // Check whether the information in the leaf is correct.
+        assertThat(leafListInfo.getName(), is("network-ref"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("identityref"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.IDENTITYREF));
+        yangIdentityRef = (YangIdentityRef) (leafListInfo.getDataType().getDataTypeExtendedInfo());
+        assertThat(yangIdentityRef.getBaseIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+    }
+
+    /**
+     * Checks inter file feature linking with included file.
+     */
+    @Test
+    public void processIdentityInIncludedFile()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfileidentityinlude";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.createYangNodeSet();
+
+        YangNode selfNode = null;
+        YangNode refNode1 = null;
+        YangNode refNode2 = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangNodeSet());
+
+        // Carry out linking of sub module with module.
+        yangLinkerManager.linkSubModulesToParentModule(utilManager.getYangNodeSet());
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangNodeSet());
+
+        // Add references to include list.
+        yangLinkerManager.addRefToYangFilesIncludeList(utilManager.getYangNodeSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangNodeSet());
+
+        for (YangNode rootNode : utilManager.getYangNodeSet()) {
+            if (rootNode.getName().equals("syslog3")) {
+                selfNode = rootNode;
+            } else if (rootNode.getName().equals("syslog4")) {
+                refNode1 = rootNode;
+            } else {
+                refNode2 = rootNode;
+            }
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("syslog3"));
+
+        YangIdentity yangIdentity = (YangIdentity) yangNode.getChild();
+        assertThat(yangIdentity.getName(), is("ipv4-address-family"));
+        assertThat(yangIdentity.getBaseNode().getBaseIdentifier().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        yangIdentity = (YangIdentity) yangNode.getChild().getNextSibling();
+        assertThat(yangIdentity.getName(), is("ipv6-address-family"));
+        assertThat(yangIdentity.getBaseNode().getBaseIdentifier().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("tunnel"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("identityref"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.IDENTITYREF));
+        YangIdentityRef yangIdentityRef = (YangIdentityRef) leafInfo.getDataType().getDataTypeExtendedInfo();
+        assertThat(yangIdentityRef.getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getBaseIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        // Check whether the information in the leaf is correct.
+        assertThat(leafListInfo.getName(), is("network-ref"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("identityref"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.IDENTITYREF));
+        yangIdentityRef = (YangIdentityRef) (leafListInfo.getDataType().getDataTypeExtendedInfo());
+        assertThat(yangIdentityRef.getBaseIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+    }
+
+    /**
+     * Checks inter file feature linking with imported file with dependency.
+     */
+    @Test
+    public void processIdentityInImportedFileWithDependency()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfileidentityimportdependency";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.createYangNodeSet();
+
+        YangNode selfNode = null;
+        YangNode refNode1 = null;
+        YangNode refNode2 = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangNodeSet());
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangNodeSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangNodeSet());
+
+        for (YangNode rootNode : utilManager.getYangNodeSet()) {
+            if (rootNode.getName().equals("syslog1")) {
+                selfNode = rootNode;
+            } else if (rootNode.getName().equals("syslog2")) {
+                refNode1 = rootNode;
+            } else {
+                refNode2 = rootNode;
+            }
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("syslog1"));
+
+        YangIdentity yangIdentity = (YangIdentity) yangNode.getChild();
+        assertThat(yangIdentity.getName(), is("ipv4-address-family"));
+        assertThat(yangIdentity.getBaseNode().getBaseIdentifier().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        yangIdentity = (YangIdentity) yangNode.getChild().getNextSibling();
+        assertThat(yangIdentity.getName(), is("ipv6-address-family"));
+        assertThat(yangIdentity.getBaseNode().getBaseIdentifier().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("tunnel"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("identityref"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.IDENTITYREF));
+        YangIdentityRef yangIdentityRef = (YangIdentityRef) leafInfo.getDataType().getDataTypeExtendedInfo();
+        assertThat(yangIdentityRef.getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getBaseIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        // Check whether the information in the leaf is correct.
+        assertThat(leafListInfo.getName(), is("network-ref"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("identityref"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.IDENTITYREF));
+        yangIdentityRef = (YangIdentityRef) (leafListInfo.getDataType().getDataTypeExtendedInfo());
+        assertThat(yangIdentityRef.getBaseIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+   }
+
+    /**
+     * Checks inter file feature linking with included file with dependency.
+     */
+    @Test
+    public void processIdentityInIncludedFileWithDependency()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfileidentityincludedependency";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.createYangNodeSet();
+
+        YangNode selfNode = null;
+        YangNode refNode1 = null;
+        YangNode refNode2 = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangNodeSet());
+
+        // Carry out linking of sub module with module.
+        yangLinkerManager.linkSubModulesToParentModule(utilManager.getYangNodeSet());
+
+        // Add references to include list.
+        yangLinkerManager.addRefToYangFilesIncludeList(utilManager.getYangNodeSet());
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangNodeSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangNodeSet());
+
+        for (YangNode rootNode : utilManager.getYangNodeSet()) {
+            if (rootNode.getName().equals("syslog1")) {
+                selfNode = rootNode;
+            } else if (rootNode.getName().equals("syslog2")) {
+                refNode1 = rootNode;
+            } else {
+                refNode2 = rootNode;
+            }
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("syslog1"));
+
+        YangIdentity yangIdentity = (YangIdentity) yangNode.getChild();
+        assertThat(yangIdentity.getName(), is("ipv4-address-family"));
+        assertThat(yangIdentity.getBaseNode().getBaseIdentifier().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        yangIdentity = (YangIdentity) yangNode.getChild().getNextSibling();
+        assertThat(yangIdentity.getName(), is("ipv6-address-family"));
+        assertThat(yangIdentity.getBaseNode().getBaseIdentifier().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("tunnel"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("identityref"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.IDENTITYREF));
+        YangIdentityRef yangIdentityRef = (YangIdentityRef) leafInfo.getDataType().getDataTypeExtendedInfo();
+        assertThat(yangIdentityRef.getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getBaseIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        // Check whether the information in the leaf is correct.
+        assertThat(leafListInfo.getName(), is("network-ref"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("identityref"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.IDENTITYREF));
+        yangIdentityRef = (YangIdentityRef) (leafListInfo.getDataType().getDataTypeExtendedInfo());
+        assertThat(yangIdentityRef.getBaseIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+    }
+
+    /**
+     * Checks inter file feature linking with imported file with dependency
+     * feature undefined.
+     */
+    @Test
+    public void processIdentityInImportedFileWithDependencyUndefined()
+            throws IOException, LinkerException, MojoExecutionException {
+        thrown.expect(LinkerException.class);
+        thrown.expectMessage("YANG file error: Unable to find base identity for given base");
+
+        String searchDir = "src/test/resources/interfileidentityimportdependencyUndefined";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.createYangNodeSet();
+
+        YangNode selfNode = null;
+        YangNode refNode1 = null;
+        YangNode refNode2 = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangNodeSet());
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangNodeSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangNodeSet());
+    }
+
+    /**
+     * Checks inter file feature linking with included file with dependency
+     * feature undefined.
+     */
+    @Test
+    public void processIdentityInIncludedFileWithDependencyUndefined()
+            throws IOException, LinkerException, MojoExecutionException {
+        thrown.expect(LinkerException.class);
+        thrown.expectMessage("YANG file error: Unable to find base identity for given base");
+
+        String searchDir = "src/test/resources/interfileidentityincludedependencyUndefined";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.createYangNodeSet();
+
+        YangNode selfNode = null;
+        YangNode refNode1 = null;
+        YangNode refNode2 = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangNodeSet());
+
+        // Carry out linking of sub module with module.
+        yangLinkerManager.linkSubModulesToParentModule(utilManager.getYangNodeSet());
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangNodeSet());
+
+        // Add references to include list.
+        yangLinkerManager.addRefToYangFilesIncludeList(utilManager.getYangNodeSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangNodeSet());
+    }
+
+    /**
+     * Checks inter file feature linking with imported file.
+     */
+    @Test
+    public void processIdentityTypedefUnresolvedInImportedFile()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfileidentitytypedef";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.createYangNodeSet();
+
+        YangNode selfNode = null;
+        YangNode refNode1 = null;
+        YangNode refNode2 = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangNodeSet());
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangNodeSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangNodeSet());
+
+        for (YangNode rootNode : utilManager.getYangNodeSet()) {
+            if (rootNode.getName().equals("IdentityIntraFile")) {
+                selfNode = rootNode;
+            } else if (rootNode.getName().equals("IdentityInModule")) {
+                refNode1 = rootNode;
+            } else {
+                refNode2 = rootNode;
+            }
+        }
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("IdentityIntraFile"));
+
+        YangIdentity yangIdentity = (YangIdentity) yangNode.getChild();
+        assertThat(yangIdentity.getName(), is("ipv4-address-family"));
+        assertThat(yangIdentity.getBaseNode().getBaseIdentifier().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        yangIdentity = (YangIdentity) yangNode.getChild().getNextSibling();
+        assertThat(yangIdentity.getName(), is("ipv6-address-family"));
+        assertThat(yangIdentity.getBaseNode().getBaseIdentifier().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("tunnel"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("identityref"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.IDENTITYREF));
+        YangIdentityRef yangIdentityRef = (YangIdentityRef) leafInfo.getDataType().getDataTypeExtendedInfo();
+        assertThat(yangIdentityRef.getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getBaseIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        // Check whether the information in the leaf is correct.
+        assertThat(leafListInfo.getName(), is("network-ref"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("identityref"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.IDENTITYREF));
+        yangIdentityRef = (YangIdentityRef) (leafListInfo.getDataType().getDataTypeExtendedInfo());
+        // Check whether leafref type got resolved.
+        assertThat(yangIdentityRef.getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        YangTypeDef typedef = (YangTypeDef) yangNode.getChild().getNextSibling().getNextSibling();
+        assertThat(typedef.getName(), is("type15"));
+
+        YangType type = typedef.getTypeList().iterator().next();
+        assertThat(type.getDataType(), is(YangDataTypes.IDENTITYREF));
+        assertThat(type.getDataTypeName(), is("identityref"));
+
+        YangIdentityRef identityRef = (YangIdentityRef) type.getDataTypeExtendedInfo();
+        assertThat(identityRef.getName(), is("ref-address-family"));
+        assertThat(identityRef.getBaseIdentity().getName(), is("ref-address-family"));
+        assertThat(identityRef.getResolvableStatus(), is(ResolvableStatus.UNRESOLVED));
+    }
+
+    /**
+     * Checks inter file feature linking with imported file.
+     */
+    @Test
+    public void processIdentityTypedefInImportedFile()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfileidentitytypedef";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.createYangNodeSet();
+
+        YangNode selfNode = null;
+        YangNode refNode1 = null;
+        YangNode refNode2 = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangNodeSet());
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangNodeSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangNodeSet());
+
+        for (YangNode rootNode : utilManager.getYangNodeSet()) {
+            if (rootNode.getName().equals("IdentityTypedef")) {
+                selfNode = rootNode;
+            } else if (rootNode.getName().equals("IdentityInModule")) {
+                refNode1 = rootNode;
+            } else {
+                refNode2 = rootNode;
+            }
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("IdentityTypedef"));
+
+        YangIdentity yangIdentity = (YangIdentity) yangNode.getChild();
+        assertThat(yangIdentity.getName(), is("ipv4-address-family"));
+        assertThat(yangIdentity.getBaseNode().getBaseIdentifier().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        yangIdentity = (YangIdentity) yangNode.getChild().getNextSibling();
+        assertThat(yangIdentity.getName(), is("ipv6-address-family"));
+        assertThat(yangIdentity.getBaseNode().getBaseIdentifier().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentity.getBaseNode().getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        YangTypeDef typedef = (YangTypeDef) yangNode.getChild().getNextSibling().getNextSibling();
+        assertThat(typedef.getName(), is("type15"));
+
+        YangType type = typedef.getTypeList().iterator().next();
+        assertThat(type.getDataType(), is(YangDataTypes.IDENTITYREF));
+        assertThat(type.getDataTypeName(), is("identityref"));
+
+        YangIdentityRef identityRef = (YangIdentityRef) type.getDataTypeExtendedInfo();
+        assertThat(identityRef.getName(), is("ref-address-family"));
+        assertThat(identityRef.getBaseIdentity().getName(), is("ref-address-family"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("tunnel"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("identityref"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.IDENTITYREF));
+        YangIdentityRef yangIdentityRef = (YangIdentityRef) leafInfo.getDataType().getDataTypeExtendedInfo();
+        assertThat(yangIdentityRef.getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getBaseIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getReferredIdentity().getName(), is("ref-address-family"));
+        assertThat(yangIdentityRef.getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        // Check whether the information in the leaf is correct.
+        assertThat(leafListInfo.getName(), is("network-ref"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("identityref"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.IDENTITYREF));
+        yangIdentityRef = (YangIdentityRef) (leafListInfo.getDataType().getDataTypeExtendedInfo());
+        // Check whether leafref type got resolved.
+        assertThat(yangIdentityRef.getResolvableStatus(), is(ResolvableStatus.RESOLVED));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/IdentityInModule.yang b/utils/yangutils/plugin/src/test/resources/IdentityInModule.yang
new file mode 100644
index 0000000..5688615
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/IdentityInModule.yang
@@ -0,0 +1,14 @@
+module IdentityInModule{
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix IdentityInModule;
+
+    identity tunnel-type {
+        description
+           "Base identity from which specific tunnel types are derived.";
+    }
+
+    identity ref-address-family {
+        reference "http://www.iana.org/assignments/address-family-numbers/address-family-numbers.xhtml#address-family-numbers-2";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/IdentityIntraFile.yang b/utils/yangutils/plugin/src/test/resources/IdentityIntraFile.yang
new file mode 100644
index 0000000..c61fcfb
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/IdentityIntraFile.yang
@@ -0,0 +1,23 @@
+module IdentityIntraFile {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix IdentityIntraFile;
+
+    import "IdentityInModule" {
+        prefix "IdentityInModule";
+    }
+
+    identity ipv4-address-family {
+        base IdentityInModule:ref-address-family;
+    }
+
+    identity ipv6-address-family {
+        base IdentityInModule:ref-address-family;
+    }
+
+    leaf tunnel {
+        type identityref {
+            base IdentityInModule:ref-address-family;
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/IdentityListener.yang b/utils/yangutils/plugin/src/test/resources/IdentityListener.yang
new file mode 100644
index 0000000..a7ef4d2
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/IdentityListener.yang
@@ -0,0 +1,39 @@
+module IdentityListener{
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix IdentityListener;
+
+    identity tunnel {
+        description
+           "Base identity from which specific tunnel types are derived.";
+    }
+
+    identity tunnel-type {
+        description
+           "Base identity from which specific tunnel types are derived.";
+    }
+
+    identity ref-address-family {
+        reference "http://www.iana.org/assignments/address-family-numbers/address-family-numbers.xhtml#address-family-numbers-2";
+    }
+
+    identity ipv4-address-family {
+        base ref-address-family;
+    }
+
+    identity ipv6-address-family {
+        base ref-address-family;
+    }
+
+    leaf tunnel {
+        type identityref {
+            base ref-address-family;
+        }
+    }
+
+    leaf-list network-ref {
+        type identityref {
+            base ref-address-family;
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/IdentityTypedef.yang b/utils/yangutils/plugin/src/test/resources/IdentityTypedef.yang
new file mode 100644
index 0000000..6e8f603
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/IdentityTypedef.yang
@@ -0,0 +1,20 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+
+    identity tunnel {
+        description
+           "Base identity from which specific tunnel types are derived.";
+    }
+
+    leaf tunnel-value {
+        type type15;
+    }
+
+    typedef type15 {
+        type identityref {
+             base tunnel;
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/IdentityTypedefUnresolved.yang b/utils/yangutils/plugin/src/test/resources/IdentityTypedefUnresolved.yang
new file mode 100644
index 0000000..d837fd1
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/IdentityTypedefUnresolved.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+
+    identity tunnel {
+        description
+           "Base identity from which specific tunnel types are derived.";
+    }
+
+    typedef type15 {
+        type identityref {
+             base tunnel;
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/IdentityrefInvalidIdentifier.yang b/utils/yangutils/plugin/src/test/resources/IdentityrefInvalidIdentifier.yang
deleted file mode 100644
index 99a8129..0000000
--- a/utils/yangutils/plugin/src/test/resources/IdentityrefInvalidIdentifier.yang
+++ /dev/null
@@ -1,11 +0,0 @@
-module Test {
-    yang-version 1;
-    namespace http://huawei.com;
-    prefix Ant;
-    grouping currentcheck {
-        leaf invalid-interval {
-            type identityref {
-            }
-        }
-    }
-}
diff --git a/utils/yangutils/plugin/src/test/resources/identityRef/identityRef.yang b/utils/yangutils/plugin/src/test/resources/identityRef/identityRef.yang
new file mode 100644
index 0000000..a7389e7
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/identityRef/identityRef.yang
@@ -0,0 +1,19 @@
+module IdentityTest{
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix IdentityTest;
+
+    identity ref-address-family {
+        description "ref-address-family";
+    }
+
+    identity ipv4-address-family {
+        base ref-address-family;
+    }
+
+    leaf tunnel {
+        type identityref {
+            base ref-address-family;
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityimport/IdentityInModule.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityimport/IdentityInModule.yang
new file mode 100644
index 0000000..efaadd6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityimport/IdentityInModule.yang
@@ -0,0 +1,15 @@
+
+module IdentityInModule{
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix IdentityInModule;
+
+    identity tunnel-type {
+        description
+           "Base identity from which specific tunnel types are derived.";
+    }
+
+    identity ref-address-family {
+        reference "http://www.iana.org/assignments/address-family-numbers/address-family-numbers.xhtml#address-family-numbers-2";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityimport/IdentityIntraFile.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityimport/IdentityIntraFile.yang
new file mode 100644
index 0000000..4036e97
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityimport/IdentityIntraFile.yang
@@ -0,0 +1,29 @@
+module IdentityIntraFile {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix IdentityIntraFile;
+
+    import "IdentityInModule" {
+        prefix "IdentityInModule";
+    }
+
+    identity ipv4-address-family {
+        base IdentityInModule:ref-address-family;
+    }
+
+    identity ipv6-address-family {
+        base IdentityInModule:ref-address-family;
+    }
+
+    leaf tunnel {
+        type identityref {
+            base IdentityInModule:ref-address-family;
+        }
+    }
+
+    leaf-list network-ref {
+        type identityref {
+            base IdentityInModule:ref-address-family;
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependency/featurefile1.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependency/featurefile1.yang
new file mode 100644
index 0000000..b808b11
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependency/featurefile1.yang
@@ -0,0 +1,30 @@
+module syslog1 {
+    yang-version 1;
+    namespace "http://huawei1.com";
+    prefix "sys1";
+
+    import "syslog2" {
+       prefix "sys2";
+    }
+
+    identity ipv4-address-family {
+       base sys2:ref-address-family;
+    }
+
+    identity ipv6-address-family {
+       base sys2:ref-address-family;
+    }
+
+    leaf tunnel {
+        type identityref {
+            base sys2:ref-address-family;
+        }
+    }
+
+    leaf-list network-ref {
+        type identityref {
+            base sys2:ref-address-family;
+        }
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependency/featurefile2.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependency/featurefile2.yang
new file mode 100644
index 0000000..2469e24
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependency/featurefile2.yang
@@ -0,0 +1,17 @@
+module syslog2 {
+     yang-version 1;
+     namespace "http://huawei2.com";
+     prefix "sys2";
+
+     import "syslog3" {
+        prefix "sys3";
+     }
+
+     identity tunnel-type {
+         base sys3:final-address-family;
+     }
+
+     identity ref-address-family {
+         base sys3:final-address-family;
+     }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependency/featurefile3.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependency/featurefile3.yang
new file mode 100644
index 0000000..f460bd1
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependency/featurefile3.yang
@@ -0,0 +1,10 @@
+module syslog3 {
+     yang-version 1;
+     namespace "http://huawei3.com";
+     prefix "sys3";
+
+    identity final-address-family {
+        description
+           "Base identity from which specific tunnel types are derived.";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependencyUndefined/featurefile1.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependencyUndefined/featurefile1.yang
new file mode 100644
index 0000000..ec2e48c
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependencyUndefined/featurefile1.yang
@@ -0,0 +1,29 @@
+module syslog1 {
+     yang-version 1;
+     namespace "http://huawei1.com";
+     prefix "sys1";
+
+     import "syslog2" {
+        prefix "sys2";
+     }
+
+     identity ipv4-address-family {
+        base sys2:ref-address-family;
+     }
+
+     identity ipv6-address-family {
+        base sys2:ref-address-family;
+     }
+
+    leaf tunnel {
+        type identityref {
+            base sys2:ref-address-family;
+        }
+    }
+
+    leaf-list network-ref {
+        type identityref {
+            base sys2:ref-address-family;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependencyUndefined/featurefile2.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependencyUndefined/featurefile2.yang
new file mode 100644
index 0000000..25e66af
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependencyUndefined/featurefile2.yang
@@ -0,0 +1,18 @@
+module syslog2 {
+     yang-version 1;
+     namespace "http://huawei2.com";
+     prefix "sys2";
+
+     import "syslog3" {
+        prefix "sys3";
+     }
+
+     identity tunnel-type {
+         base sys3:final-address-family;
+     }
+
+     identity ref-address-family {
+         base sys3:final-address-family;
+     }
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependencyUndefined/featurefile3.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependencyUndefined/featurefile3.yang
new file mode 100644
index 0000000..f638139
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityimportdependencyUndefined/featurefile3.yang
@@ -0,0 +1,5 @@
+module syslog3 {
+     yang-version 1;
+     namespace "http://huawei3.com";
+     prefix "sys3";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependency/featurefile1.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependency/featurefile1.yang
new file mode 100644
index 0000000..fe987ea
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependency/featurefile1.yang
@@ -0,0 +1,27 @@
+module syslog1 {
+    yang-version 1;
+    namespace "http://huawei3.com";
+    prefix "sys1";
+
+    include "syslog2";
+
+    identity ipv4-address-family {
+       base ref-address-family;
+    }
+
+    identity ipv6-address-family {
+       base ref-address-family;
+    }
+
+    leaf tunnel {
+        type identityref {
+            base ref-address-family;
+        }
+    }
+
+    leaf-list network-ref {
+        type identityref {
+            base ref-address-family;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependency/featurefile2.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependency/featurefile2.yang
new file mode 100644
index 0000000..14fd83c
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependency/featurefile2.yang
@@ -0,0 +1,19 @@
+submodule syslog2 {
+     yang-version 1;
+     belongs-to "syslog1" {
+         prefix "sys1";
+     }
+
+     import "syslog3" {
+        prefix "sys3";
+     }
+
+     identity tunnel-type {
+         base sys3:final-address-family;
+     }
+
+     identity ref-address-family {
+         base sys3:final-address-family;
+     }
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependency/featurefile3.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependency/featurefile3.yang
new file mode 100644
index 0000000..aa056f0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependency/featurefile3.yang
@@ -0,0 +1,10 @@
+module syslog3 {
+     yang-version 1;
+     namespace "http://huawei3.com";
+     prefix "sys3";
+
+     identity final-address-family {
+         description
+            "Base identity from which specific tunnel types are derived.";
+     }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependencyUndefined/featurefile1.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependencyUndefined/featurefile1.yang
new file mode 100644
index 0000000..bc4878f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependencyUndefined/featurefile1.yang
@@ -0,0 +1,27 @@
+module syslog1 {
+    yang-version 1;
+    namespace "http://huawei3.com";
+    prefix "sys1";
+
+    include "syslog2";
+
+    identity ipv4-address-family {
+       base sys2:ref-address-family;
+    }
+
+    identity ipv6-address-family {
+       base sys2:ref-address-family;
+    }
+
+    leaf tunnel {
+        type identityref {
+            base sys2:ref-address-family;
+        }
+    }
+
+    leaf-list network-ref {
+        type identityref {
+            base sys2:ref-address-family;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependencyUndefined/featurefile2.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependencyUndefined/featurefile2.yang
new file mode 100644
index 0000000..14fd83c
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependencyUndefined/featurefile2.yang
@@ -0,0 +1,19 @@
+submodule syslog2 {
+     yang-version 1;
+     belongs-to "syslog1" {
+         prefix "sys1";
+     }
+
+     import "syslog3" {
+        prefix "sys3";
+     }
+
+     identity tunnel-type {
+         base sys3:final-address-family;
+     }
+
+     identity ref-address-family {
+         base sys3:final-address-family;
+     }
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependencyUndefined/featurefile3.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependencyUndefined/featurefile3.yang
new file mode 100644
index 0000000..f638139
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityincludedependencyUndefined/featurefile3.yang
@@ -0,0 +1,5 @@
+module syslog3 {
+     yang-version 1;
+     namespace "http://huawei3.com";
+     prefix "sys3";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityinlude/IdentityInModule.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityinlude/IdentityInModule.yang
new file mode 100644
index 0000000..e42ad86
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityinlude/IdentityInModule.yang
@@ -0,0 +1,27 @@
+module syslog3 {
+     yang-version 1;
+     namespace "http://huawei3.com";
+     prefix "sys3";
+
+     include "syslog4";
+
+     identity ipv4-address-family {
+         base ref-address-family;
+     }
+
+     identity ipv6-address-family {
+         base ref-address-family;
+     }
+
+    leaf tunnel {
+         type identityref {
+             base ref-address-family;
+         }
+    }
+
+    leaf-list network-ref {
+        type identityref {
+            base ref-address-family;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentityinlude/IdentityIntraFile.yang b/utils/yangutils/plugin/src/test/resources/interfileidentityinlude/IdentityIntraFile.yang
new file mode 100644
index 0000000..ffa1a7d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentityinlude/IdentityIntraFile.yang
@@ -0,0 +1,15 @@
+submodule syslog4 {
+     yang-version 1;
+     belongs-to "syslog3" {
+         prefix "sys3";
+     }
+
+     identity tunnel-type {
+         description
+            "Base identity from which specific tunnel types are derived.";
+     }
+
+     identity ref-address-family {
+         reference "http://www.iana.org/assignments/address-family-numbers/address-family-numbers.xhtml#address-family-numbers-2";
+     }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentitytypedef/IdentityInModule.yang b/utils/yangutils/plugin/src/test/resources/interfileidentitytypedef/IdentityInModule.yang
new file mode 100644
index 0000000..5688615
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentitytypedef/IdentityInModule.yang
@@ -0,0 +1,14 @@
+module IdentityInModule{
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix IdentityInModule;
+
+    identity tunnel-type {
+        description
+           "Base identity from which specific tunnel types are derived.";
+    }
+
+    identity ref-address-family {
+        reference "http://www.iana.org/assignments/address-family-numbers/address-family-numbers.xhtml#address-family-numbers-2";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentitytypedef/IdentityIntraFile.yang b/utils/yangutils/plugin/src/test/resources/interfileidentitytypedef/IdentityIntraFile.yang
new file mode 100644
index 0000000..fcb2984
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentitytypedef/IdentityIntraFile.yang
@@ -0,0 +1,35 @@
+module IdentityIntraFile {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix IdentityIntraFile;
+
+    import "IdentityInModule" {
+        prefix "IdentityInModule";
+    }
+
+    identity ipv4-address-family {
+        base IdentityInModule:ref-address-family;
+    }
+
+    identity ipv6-address-family {
+        base IdentityInModule:ref-address-family;
+    }
+
+    leaf tunnel {
+        type identityref {
+            base IdentityInModule:ref-address-family;
+        }
+    }
+
+    leaf-list network-ref {
+        type identityref {
+            base IdentityInModule:ref-address-family;
+        }
+    }
+
+    typedef type15 {
+        type identityref {
+            base IdentityInModule:ref-address-family;
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/interfileidentitytypedef/IdentityTypedef.yang b/utils/yangutils/plugin/src/test/resources/interfileidentitytypedef/IdentityTypedef.yang
new file mode 100644
index 0000000..6a58976
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileidentitytypedef/IdentityTypedef.yang
@@ -0,0 +1,31 @@
+module IdentityTypedef {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix IdentityTypedef;
+
+    import "IdentityInModule" {
+        prefix "IdentityInModule";
+    }
+
+    identity ipv4-address-family {
+        base IdentityInModule:ref-address-family;
+    }
+
+    identity ipv6-address-family {
+        base IdentityInModule:ref-address-family;
+    }
+
+    leaf tunnel {
+        type type15;
+    }
+
+    leaf-list network-ref {
+        type type15;
+    }
+
+    typedef type15 {
+        type identityref {
+            base IdentityInModule:ref-address-family;
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-te-types.yang b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-te-types.yang
index 6268832..ffa1984 100644
--- a/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-te-types.yang
+++ b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-te-types.yang
@@ -56,7 +56,7 @@
        reference "RFC3209";
      }
 
-     /*identity tunnel-type {
+     identity tunnel-type {
        description
          "Base identity from which specific tunnel types are
          derived.";
@@ -254,7 +254,7 @@
        base lsp-encoding-types;
        description
          "Line (e.g., 8B/10B) LSP encoding";
-     }*/
+     }
 
      /* TE basic features */
      feature p2mp-te {
@@ -452,7 +452,7 @@
        }
      }
 
-     /*identity route-usage-type {
+     identity route-usage-type {
        description
          "Base identity for route usage";
      }
@@ -576,7 +576,7 @@
        description
          "The set of attribute filters associated with a
          tunnel any of which renders a link unacceptable";
-     }*/
+     }
 
      typedef admin-group {
        type binary {
@@ -605,7 +605,7 @@
        description "SRLG type";
      }
 
-     /*identity path-computation-srlg-type {
+     identity path-computation-srlg-type {
        description
          "Base identity for SRLG path computation";
      }
@@ -632,7 +632,7 @@
        base path-computation-srlg-type;
        description
          "Include weighted SRLG check in path computation";
-     }*/
+     }
 
      typedef te-metric {
        type uint32;