diff --git a/apps/pce/app/src/test/java/org/onosproject/pce/pceservice/BasicPceccHandlerTest.java b/apps/pce/app/src/test/java/org/onosproject/pce/pceservice/BasicPceccHandlerTest.java
new file mode 100644
index 0000000..a5ea175
--- /dev/null
+++ b/apps/pce/app/src/test/java/org/onosproject/pce/pceservice/BasicPceccHandlerTest.java
@@ -0,0 +1,280 @@
+/*
+ * 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.pce.pceservice;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.hamcrest.Matchers.nullValue;
+
+import static org.onosproject.net.Link.Type.DIRECT;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.LinkedList;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import org.onlab.packet.IpAddress;
+import org.onosproject.core.DefaultGroupId;
+import org.onosproject.incubator.net.tunnel.Tunnel;
+import org.onosproject.incubator.net.tunnel.TunnelEndPoint;
+import org.onosproject.incubator.net.tunnel.IpTunnelEndPoint;
+import org.onosproject.incubator.net.tunnel.TunnelName;
+import org.onosproject.incubator.net.tunnel.TunnelId;
+import org.onosproject.incubator.net.tunnel.DefaultTunnel;
+import org.onosproject.incubator.net.resource.label.LabelResourceId;
+import org.onosproject.incubator.net.resource.label.LabelResourceService;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.net.DefaultPath;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.Path;
+import org.onosproject.pce.pcestore.api.LspLocalLabelInfo;
+import org.onosproject.pce.pcestore.api.PceStore;
+import org.onosproject.pce.pcestore.PceccTunnelInfo;
+import org.onosproject.pce.pcestore.DefaultLspLocalLabelInfo;
+import org.onosproject.net.provider.ProviderId;
+import org.onosproject.pce.util.LabelResourceAdapter;
+import org.onosproject.pce.util.PceStoreAdapter;
+import org.onosproject.net.DefaultLink;
+import org.onosproject.net.Link;
+
+/**
+ * Unit tests for BasicPceccHandler class.
+ */
+public class BasicPceccHandlerTest {
+
+    public static final long LOCAL_LABEL_SPACE_MIN = 5122;
+    public static final long LOCAL_LABEL_SPACE_MAX = 9217;
+
+    private BasicPceccHandler pceccHandler;
+    protected LabelResourceService labelRsrcService;
+    protected PceStore pceStore;
+    private TunnelEndPoint src = IpTunnelEndPoint.ipTunnelPoint(IpAddress.valueOf(23423));
+    private TunnelEndPoint dst = IpTunnelEndPoint.ipTunnelPoint(IpAddress.valueOf(32421));
+    private DefaultGroupId groupId = new DefaultGroupId(92034);
+    private TunnelName tunnelName = TunnelName.tunnelName("TunnelName");
+    private TunnelId tunnelId = TunnelId.valueOf("41654654");
+    private ProviderId producerName = new ProviderId("producer1", "13");
+    private Path path;
+    private Tunnel tunnel;
+    private PceccTunnelInfo pceccTunnelInfo;
+    private DeviceId deviceId1;
+    private DeviceId deviceId2;
+    private DeviceId deviceId3;
+    private DeviceId deviceId4;
+    private DeviceId deviceId5;
+    private PortNumber port1;
+    private PortNumber port2;
+    private PortNumber port3;
+    private PortNumber port4;
+    private PortNumber port5;
+
+    @Before
+    public void setUp() throws Exception {
+       pceccHandler = BasicPceccHandler.getInstance();
+       labelRsrcService = new LabelResourceAdapter();
+       pceStore = new PceStoreAdapter();
+       pceccHandler.initialize(labelRsrcService, pceStore);
+
+       // Cretae tunnel test
+       // Link
+       ProviderId providerId = new ProviderId("of", "foo");
+       deviceId1 = DeviceId.deviceId("of:A");
+       deviceId2 = DeviceId.deviceId("of:B");
+       deviceId3 = DeviceId.deviceId("of:C");
+       deviceId4 = DeviceId.deviceId("of:D");
+       deviceId5 = DeviceId.deviceId("of:E");
+       port1 = PortNumber.portNumber(1);
+       port2 = PortNumber.portNumber(2);
+       port3 = PortNumber.portNumber(3);
+       port4 = PortNumber.portNumber(4);
+       port5 = PortNumber.portNumber(5);
+       List<Link> linkList = new LinkedList<>();
+
+       Link l1 = DefaultLink.builder()
+                            .providerId(providerId)
+                            .annotations(DefaultAnnotations.builder().set("key1", "yahoo").build())
+                            .src(new ConnectPoint(deviceId1, port1))
+                            .dst(new ConnectPoint(deviceId2, port2))
+                            .type(DIRECT)
+                            .state(Link.State.ACTIVE)
+                            .build();
+       linkList.add(l1);
+       Link l2 = DefaultLink.builder()
+                            .providerId(providerId)
+                            .annotations(DefaultAnnotations.builder().set("key2", "yahoo").build())
+                            .src(new ConnectPoint(deviceId2, port2))
+                            .dst(new ConnectPoint(deviceId3, port3))
+                            .type(DIRECT)
+                            .state(Link.State.ACTIVE)
+                            .build();
+       linkList.add(l2);
+       Link l3 = DefaultLink.builder()
+                            .providerId(providerId)
+                            .annotations(DefaultAnnotations.builder().set("key3", "yahoo").build())
+                            .src(new ConnectPoint(deviceId3, port3))
+                            .dst(new ConnectPoint(deviceId4, port4))
+                            .type(DIRECT)
+                            .state(Link.State.ACTIVE)
+                            .build();
+       linkList.add(l3);
+       Link l4 = DefaultLink.builder()
+                            .providerId(providerId)
+                            .annotations(DefaultAnnotations.builder().set("key4", "yahoo").build())
+                            .src(new ConnectPoint(deviceId4, port4))
+                            .dst(new ConnectPoint(deviceId5, port5))
+                            .type(DIRECT)
+                            .state(Link.State.ACTIVE)
+                            .build();
+       linkList.add(l4);
+
+       // Path
+       path = new DefaultPath(providerId, linkList, 10);
+
+       // Tunnel
+       tunnel = new DefaultTunnel(producerName, src, dst, Tunnel.Type.VXLAN,
+                                  Tunnel.State.ACTIVE, groupId, tunnelId,
+                                  tunnelName, path);
+    }
+
+    @After
+    public void tearDown() throws Exception {
+    }
+
+    /**
+     * Checks the operation of getInstance() method.
+     */
+    @Test
+    public void testGetInstance() {
+        assertThat(pceccHandler, is(notNullValue()));
+    }
+
+    /**
+     * Checks the operation of allocateLabel() method.
+     */
+    @Test
+    public void testAllocateLabel() {
+       List<LspLocalLabelInfo> lspLocalLabelInfoList;
+       Iterator<LspLocalLabelInfo> iterator;
+       LspLocalLabelInfo lspLocalLabelInfo;
+       DeviceId deviceId;
+       LabelResourceId inLabelId;
+       LabelResourceId outLabelId;
+       PortNumber inPort;
+       PortNumber outPort;
+
+       // check allocation result
+       assertThat(pceccHandler.allocateLabel(tunnel), is(true));
+
+       // Check list of devices with IN and OUT labels whether stored properly in store
+       pceccTunnelInfo = pceStore.getTunnelInfo(tunnel.tunnelId());
+       lspLocalLabelInfoList = pceccTunnelInfo.lspLocalLabelInfoList();
+       iterator = lspLocalLabelInfoList.iterator();
+
+       // Retrieve values and check device5
+       lspLocalLabelInfo = (DefaultLspLocalLabelInfo) iterator.next();
+       deviceId = lspLocalLabelInfo.deviceId();
+       inLabelId = lspLocalLabelInfo.inLabelId();
+       outLabelId = lspLocalLabelInfo.outLabelId();
+       inPort = lspLocalLabelInfo.inPort();
+       outPort = lspLocalLabelInfo.outPort();
+
+       assertThat(deviceId, is(deviceId5));
+       assertThat(inLabelId, is(notNullValue()));
+       assertThat(outLabelId, is(nullValue()));
+       assertThat(inPort, is(port5));
+       assertThat(outPort, is(nullValue()));
+
+       // Next element check
+       // Retrieve values and check device4
+       lspLocalLabelInfo = (DefaultLspLocalLabelInfo) iterator.next();
+       deviceId = lspLocalLabelInfo.deviceId();
+       inLabelId = lspLocalLabelInfo.inLabelId();
+       outLabelId = lspLocalLabelInfo.outLabelId();
+       inPort = lspLocalLabelInfo.inPort();
+       outPort = lspLocalLabelInfo.outPort();
+
+       assertThat(deviceId, is(deviceId4));
+       assertThat(inLabelId, is(notNullValue()));
+       assertThat(outLabelId, is(notNullValue()));
+       assertThat(inPort, is(port4));
+       assertThat(outPort, is(port5));
+
+       // Next element check
+       // Retrieve values and check device3
+       lspLocalLabelInfo = (DefaultLspLocalLabelInfo) iterator.next();
+       deviceId = lspLocalLabelInfo.deviceId();
+       inLabelId = lspLocalLabelInfo.inLabelId();
+       outLabelId = lspLocalLabelInfo.outLabelId();
+       inPort = lspLocalLabelInfo.inPort();
+       outPort = lspLocalLabelInfo.outPort();
+
+       assertThat(deviceId, is(deviceId3));
+       assertThat(inLabelId, is(notNullValue()));
+       assertThat(outLabelId, is(notNullValue()));
+       assertThat(inPort, is(port3));
+       assertThat(outPort, is(port4));
+
+       // Next element check
+       // Retrieve values and check device2
+       lspLocalLabelInfo = (DefaultLspLocalLabelInfo) iterator.next();
+       deviceId = lspLocalLabelInfo.deviceId();
+       inLabelId = lspLocalLabelInfo.inLabelId();
+       outLabelId = lspLocalLabelInfo.outLabelId();
+       inPort = lspLocalLabelInfo.inPort();
+       outPort = lspLocalLabelInfo.outPort();
+
+       assertThat(deviceId, is(deviceId2));
+       assertThat(inLabelId, is(notNullValue()));
+       assertThat(outLabelId, is(notNullValue()));
+       assertThat(inPort, is(port2));
+       assertThat(outPort, is(port3));
+
+       // Next element check
+       // Retrieve values and check device1
+       lspLocalLabelInfo = (DefaultLspLocalLabelInfo) iterator.next();
+       deviceId = lspLocalLabelInfo.deviceId();
+       inLabelId = lspLocalLabelInfo.inLabelId();
+       outLabelId = lspLocalLabelInfo.outLabelId();
+       inPort = lspLocalLabelInfo.inPort();
+       outPort = lspLocalLabelInfo.outPort();
+
+       assertThat(deviceId, is(deviceId1));
+       assertThat(inLabelId, is(nullValue()));
+       assertThat(outLabelId, is(notNullValue()));
+       assertThat(inPort, is(nullValue()));
+       assertThat(outPort, is(port2));
+    }
+
+    /**
+     * Checks the operation of releaseLabel() method.
+     */
+    @Test
+    public void testReleaseLabel() {
+       // Release tunnels
+       assertThat(pceccHandler.allocateLabel(tunnel), is(true));
+       pceccHandler.releaseLabel(tunnel);
+
+       // Retrieve from store. Store should not contain this tunnel info.
+       pceccTunnelInfo = pceStore.getTunnelInfo(tunnel.tunnelId());
+       assertThat(pceccTunnelInfo, is(nullValue()));
+    }
+}
diff --git a/apps/pce/app/src/test/java/org/onosproject/pce/pceservice/PceccSrTeBeHandlerTest.java b/apps/pce/app/src/test/java/org/onosproject/pce/pceservice/PceccSrTeBeHandlerTest.java
new file mode 100644
index 0000000..93f7c69
--- /dev/null
+++ b/apps/pce/app/src/test/java/org/onosproject/pce/pceservice/PceccSrTeBeHandlerTest.java
@@ -0,0 +1,484 @@
+/*
+ * 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.pce.pceservice;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.hamcrest.Matchers.nullValue;
+
+import static org.onosproject.net.Link.Type.DIRECT;
+
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.List;
+import java.util.LinkedList;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import org.onosproject.incubator.net.resource.label.LabelResourceId;
+import org.onosproject.incubator.net.resource.label.LabelResourceAdminService;
+import org.onosproject.incubator.net.resource.label.LabelResourceService;
+import org.onosproject.incubator.net.tunnel.LabelStack;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.net.DefaultPath;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.Path;
+import org.onosproject.pce.pcestore.api.PceStore;
+import org.onosproject.net.provider.ProviderId;
+import org.onosproject.pce.util.LabelResourceAdapter;
+import org.onosproject.pce.util.PceStoreAdapter;
+import org.onosproject.net.DefaultLink;
+import org.onosproject.net.Link;
+
+/**
+ * Unit tests for PceccSrTeBeHandler class.
+ */
+public class PceccSrTeBeHandlerTest {
+
+    public static final long GLOBAL_LABEL_SPACE_MIN = 4097;
+    public static final long GLOBAL_LABEL_SPACE_MAX = 5121;
+
+    private PceccSrTeBeHandler srTeHandler;
+    protected LabelResourceAdminService labelRsrcAdminService;
+    protected LabelResourceService labelRsrcService;
+    protected PceStore pceStore;
+    private ProviderId providerId;
+    private DeviceId deviceId1;
+    private DeviceId deviceId2;
+    private DeviceId deviceId3;
+    private DeviceId deviceId4;
+    private DeviceId deviceId5;
+    private PortNumber port1;
+    private PortNumber port2;
+    private PortNumber port3;
+    private PortNumber port4;
+    private PortNumber port5;
+    private Link link1;
+    private Link link2;
+    private Link link3;
+    private Link link4;
+    private Path path1;
+    LabelResourceId labelId;
+    private LabelResourceId labelId1 = LabelResourceId.labelResourceId(4098);
+    private LabelResourceId labelId2 = LabelResourceId.labelResourceId(4099);
+    private Map<DeviceId, String> deviceIdLsrIdMap;
+
+    @Before
+    public void setUp() throws Exception {
+        // Initialization of member variables
+        srTeHandler = PceccSrTeBeHandler.getInstance();
+        labelRsrcService = new LabelResourceAdapter();
+        labelRsrcAdminService = new LabelResourceAdapter();
+        pceStore = new PceStoreAdapter();
+        srTeHandler.initialize(labelRsrcAdminService, labelRsrcService, pceStore);
+
+        // Creates path
+        // Creates list of links
+        providerId = new ProviderId("of", "foo");
+        deviceId1 = DeviceId.deviceId("of:A");
+        deviceId2 = DeviceId.deviceId("of:B");
+        deviceId3 = DeviceId.deviceId("of:C");
+        deviceId4 = DeviceId.deviceId("of:D");
+        deviceId5 = DeviceId.deviceId("of:E");
+        port1 = PortNumber.portNumber(1);
+        port2 = PortNumber.portNumber(2);
+        port3 = PortNumber.portNumber(3);
+        port4 = PortNumber.portNumber(4);
+        port5 = PortNumber.portNumber(5);
+        List<Link> linkList = new LinkedList<>();
+
+        link1 = DefaultLink.builder()
+                .providerId(providerId)
+                .annotations(DefaultAnnotations.builder().set("key1", "yahoo").build())
+                .src(new ConnectPoint(deviceId1, port1))
+                .dst(new ConnectPoint(deviceId2, port2))
+                .type(DIRECT)
+                .state(Link.State.ACTIVE)
+                .build();
+        linkList.add(link1);
+        link2 = DefaultLink.builder()
+                .providerId(providerId)
+                .annotations(DefaultAnnotations.builder().set("key2", "yahoo").build())
+                .src(new ConnectPoint(deviceId2, port2))
+                .dst(new ConnectPoint(deviceId3, port3))
+                .type(DIRECT)
+                .state(Link.State.ACTIVE)
+                .build();
+        linkList.add(link2);
+        link3 = DefaultLink.builder()
+                .providerId(providerId)
+                .annotations(DefaultAnnotations.builder().set("key3", "yahoo").build())
+                .src(new ConnectPoint(deviceId3, port3))
+                .dst(new ConnectPoint(deviceId4, port4))
+                .type(DIRECT)
+                .state(Link.State.ACTIVE)
+                .build();
+        linkList.add(link3);
+        link4 = DefaultLink.builder()
+                .providerId(providerId)
+                .annotations(DefaultAnnotations.builder().set("key4", "yahoo").build())
+                .src(new ConnectPoint(deviceId4, port4))
+                .dst(new ConnectPoint(deviceId5, port5))
+                .type(DIRECT)
+                .state(Link.State.ACTIVE)
+                .build();
+        linkList.add(link4);
+
+        // Path
+        path1 = new DefaultPath(providerId, linkList, 10);
+    }
+
+    @After
+    public void tearDown() throws Exception {
+    }
+
+    /**
+     * Checks the operation of getInstance() method.
+     */
+    @Test
+    public void testGetInstance() {
+        assertThat(srTeHandler, is(notNullValue()));
+    }
+
+    /**
+     * Checks the operation of reserveGlobalPool() method.
+     */
+    @Test
+    public void testReserveGlobalPool() {
+        assertThat(srTeHandler.reserveGlobalPool(GLOBAL_LABEL_SPACE_MIN,
+                GLOBAL_LABEL_SPACE_MAX), is(true));
+    }
+
+    /**
+     * Checks the operation of allocateNodeLabel() method on node label.
+     * Considered some nodes are already available before PceManager came up.
+     */
+    @Test
+    public void testAllocateNodeLabel1() {
+        // Specific device deviceId1
+
+        // Devices mapping with lsr-id
+        deviceIdLsrIdMap = new HashMap<>();
+
+        //device 1
+        String lsrId1 = "11.1.1.1";
+        deviceIdLsrIdMap.put(deviceId1, lsrId1);
+
+        // device 2
+        String lsrId2 = "12.1.1.1";
+        deviceIdLsrIdMap.put(deviceId2, lsrId2);
+
+        // device 3
+        String lsrId3 = "13.1.1.1";
+        deviceIdLsrIdMap.put(deviceId3, lsrId3);
+
+        // device 4
+        String lsrId4 = "14.1.1.1";
+        deviceIdLsrIdMap.put(deviceId4, lsrId4);
+
+        // device 5
+        String lsrId5 = "15.1.1.1";
+        deviceIdLsrIdMap.put(deviceId5, lsrId5);
+
+        // Considered devices are stored in deviceIdLsrIdMap.
+        // Creating temporary tempDeviceIdLsrIdMap to pass to allocateNodeLabel()
+        Map<DeviceId, String> tempDeviceIdLsrIdMap = new HashMap<>();
+        for (Map.Entry element : deviceIdLsrIdMap.entrySet()) {
+            DeviceId devId = (DeviceId) element.getKey();
+            String lsrId = (String) element.getValue();
+
+            // Allocate node label for specific device devId
+            assertThat(srTeHandler.allocateNodeLabel(devId, lsrId, tempDeviceIdLsrIdMap), is(true));
+
+            // Retrieve label from store
+            LabelResourceId labelId = pceStore.getGlobalNodeLabel(devId);
+
+            // Check whether label is generated for this device devId
+            assertThat(labelId, is(notNullValue()));
+
+            //Now add device to tempDeviceIdLsrIdMap
+            tempDeviceIdLsrIdMap.put(devId, lsrId);
+        }
+    }
+
+    /**
+     * Checks the operation of allocateNodeLabel() method on node label.
+     * Considered initially map is empty and keep on getting new devices from event.
+     */
+    @Test
+    public void testAllocateNodeLabel2() {
+        // Specific device deviceId1
+
+        // Device-id mapping with lsr-id
+        deviceIdLsrIdMap = new HashMap<>();
+
+        //device 1
+        String lsrId1 = "11.1.1.1";
+        // Allocate node label for specific device deviceId1
+        assertThat(srTeHandler.allocateNodeLabel(deviceId1, lsrId1, deviceIdLsrIdMap), is(true));
+        // Retrieve label from store
+        LabelResourceId labelId = pceStore.getGlobalNodeLabel(deviceId1);
+        // Check whether label is generated for this device deviceId1
+        assertThat(labelId, is(notNullValue()));
+        //Now add device to deviceIdLsrIdMap
+        deviceIdLsrIdMap.put(deviceId1, lsrId1);
+
+        // device 2
+        String lsrId2 = "12.1.1.1";
+        // Allocate node label for specific device deviceId2
+        assertThat(srTeHandler.allocateNodeLabel(deviceId2, lsrId2, deviceIdLsrIdMap), is(true));
+        // Retrieve label from store
+        labelId = pceStore.getGlobalNodeLabel(deviceId2);
+        // Check whether label is generated for this device deviceId2
+        assertThat(labelId, is(notNullValue()));
+        //Now add device to deviceIdLsrIdMap
+        deviceIdLsrIdMap.put(deviceId2, lsrId2);
+
+        // device 3
+        String lsrId3 = "13.1.1.1";
+        // Allocate node label for specific device deviceId3
+        assertThat(srTeHandler.allocateNodeLabel(deviceId3, lsrId3, deviceIdLsrIdMap), is(true));
+        // Retrieve label from store
+        labelId = pceStore.getGlobalNodeLabel(deviceId3);
+        // Check whether label is generated for this device deviceId3
+        assertThat(labelId, is(notNullValue()));
+        //Now add device to deviceIdLsrIdMap
+        deviceIdLsrIdMap.put(deviceId3, lsrId3);
+
+        // device 4
+        String lsrId4 = "14.1.1.1";
+        // Allocate node label for specific device deviceId4
+        assertThat(srTeHandler.allocateNodeLabel(deviceId4, lsrId4, deviceIdLsrIdMap), is(true));
+        // Retrieve label from store
+        labelId = pceStore.getGlobalNodeLabel(deviceId4);
+        // Check whether label is generated for this device deviceId4
+        assertThat(labelId, is(notNullValue()));
+        //Now add device to deviceIdLsrIdMap
+        deviceIdLsrIdMap.put(deviceId4, lsrId4);
+
+        // device 5
+        String lsrId5 = "15.1.1.1";
+        // Allocate node label for specific device deviceId5
+        assertThat(srTeHandler.allocateNodeLabel(deviceId5, lsrId5, deviceIdLsrIdMap), is(true));
+        // Retrieve label from store
+        labelId = pceStore.getGlobalNodeLabel(deviceId5);
+        // Check whether label is generated for this device deviceId5
+        assertThat(labelId, is(notNullValue()));
+        //Now add device to deviceIdLsrIdMap
+        deviceIdLsrIdMap.put(deviceId5, lsrId5);
+    }
+
+    /**
+     * Checks the operation of releaseNodeLabel() method on node label.
+     */
+    @Test
+    public void testReleaseNodeLabelSuccess() {
+        testAllocateNodeLabel2();
+        // Specific device deviceId1
+
+        //device 1
+        String lsrId1 = "11.1.1.1";
+        // Check whether successfully released node label
+        assertThat(srTeHandler.releaseNodeLabel(deviceId1, lsrId1, deviceIdLsrIdMap), is(true));
+        // Check whether successfully removed label from store
+        LabelResourceId labelId = pceStore.getGlobalNodeLabel(deviceId1);
+        assertThat(labelId, is(nullValue()));
+        // Remove released deviceId1
+        deviceIdLsrIdMap.remove(deviceId1);
+
+        //device 2
+        String lsrId2 = "12.1.1.1";
+        // Check whether successfully released node label
+        assertThat(srTeHandler.releaseNodeLabel(deviceId2, lsrId2, deviceIdLsrIdMap), is(true));
+        // Check whether successfully removed label from store
+        labelId = pceStore.getGlobalNodeLabel(deviceId2);
+        assertThat(labelId, is(nullValue()));
+        // Remove released deviceId2
+        deviceIdLsrIdMap.remove(deviceId2);
+
+        //device 3
+        String lsrId3 = "13.1.1.1";
+        // Check whether successfully released node label
+        assertThat(srTeHandler.releaseNodeLabel(deviceId3, lsrId3, deviceIdLsrIdMap), is(true));
+        // Check whether successfully removed label from store
+        labelId = pceStore.getGlobalNodeLabel(deviceId3);
+        assertThat(labelId, is(nullValue()));
+        // Remove released deviceId3
+        deviceIdLsrIdMap.remove(deviceId3);
+
+        //device 4
+        String lsrId4 = "14.1.1.1";
+        // Check whether successfully released node label
+        assertThat(srTeHandler.releaseNodeLabel(deviceId4, lsrId4, deviceIdLsrIdMap), is(true));
+        // Check whether successfully removed label from store
+        labelId = pceStore.getGlobalNodeLabel(deviceId4);
+        assertThat(labelId, is(nullValue()));
+        // Remove released deviceId4
+        deviceIdLsrIdMap.remove(deviceId4);
+
+        //device 5
+        String lsrId5 = "15.1.1.1";
+        // Check whether successfully released node label
+        assertThat(srTeHandler.releaseNodeLabel(deviceId5, lsrId5, deviceIdLsrIdMap), is(true));
+        // Check whether successfully removed label from store
+        labelId = pceStore.getGlobalNodeLabel(deviceId5);
+        assertThat(labelId, is(nullValue()));
+        // Remove released deviceId5
+        deviceIdLsrIdMap.remove(deviceId5);
+    }
+
+    @Test
+    public void testReleaseNodeLabelFailure() {
+        testAllocateNodeLabel2();
+
+        //device 6
+        String lsrId6 = "16.1.1.1";
+        // Check whether successfully released node label
+        DeviceId deviceId6 = DeviceId.deviceId("foo6");
+        assertThat(srTeHandler.releaseNodeLabel(deviceId6, lsrId6, deviceIdLsrIdMap), is(false));
+    }
+
+    /**
+     * Checks the operation of allocateAdjacencyLabel() method on adjacency label.
+     */
+    @Test
+    public void testAllocateAdjacencyLabel() {
+        // test link1
+        // Check whether adjacency label is allocated successfully.
+        assertThat(srTeHandler.allocateAdjacencyLabel(link1), is(true));
+        // Retrieve from store and check whether adjacency label is generated successfully for this device.
+        LabelResourceId labelId = pceStore.getAdjLabel(link1);
+        assertThat(labelId, is(notNullValue()));
+
+        // test link2
+        // Check whether adjacency label is allocated successfully.
+        assertThat(srTeHandler.allocateAdjacencyLabel(link2), is(true));
+        // Retrieve from store and check whether adjacency label is generated successfully for this device.
+        labelId = pceStore.getAdjLabel(link2);
+        assertThat(labelId, is(notNullValue()));
+
+        // test link3
+        // Check whether adjacency label is allocated successfully.
+        assertThat(srTeHandler.allocateAdjacencyLabel(link3), is(true));
+        // Retrieve from store and check whether adjacency label is generated successfully for this device.
+        labelId = pceStore.getAdjLabel(link3);
+        assertThat(labelId, is(notNullValue()));
+
+        // test link4
+        // Check whether adjacency label is allocated successfully.
+        assertThat(srTeHandler.allocateAdjacencyLabel(link4), is(true));
+        // Retrieve from store and check whether adjacency label is generated successfully for this device.
+        labelId = pceStore.getAdjLabel(link4);
+        assertThat(labelId, is(notNullValue()));
+    }
+
+    /**
+     * Checks the operation of releaseAdjacencyLabel() method on adjacency label.
+     */
+    @Test
+    public void testReleaseAdjacencyLabel() {
+        // Test link1
+        // Check whether adjacency label is released successfully.
+        assertThat(srTeHandler.allocateAdjacencyLabel(link1), is(true));
+        assertThat(srTeHandler.releaseAdjacencyLabel(link1), is(true));
+        // Retrieve from store and check whether adjacency label is removed successfully for this device.
+        LabelResourceId labelId = pceStore.getAdjLabel(link1);
+        assertThat(labelId, is(nullValue()));
+
+        // Test link2
+        // Check whether adjacency label is released successfully.
+        assertThat(srTeHandler.allocateAdjacencyLabel(link2), is(true));
+        assertThat(srTeHandler.releaseAdjacencyLabel(link2), is(true));
+        // Retrieve from store and check whether adjacency label is removed successfully for this device.
+        labelId = pceStore.getAdjLabel(link2);
+        assertThat(labelId, is(nullValue()));
+    }
+
+    /**
+     * Checks the operation of computeLabelStack() method.
+     */
+    @Test
+    public void testComputeLabelStack() {
+        // Allocate node labels to each devices
+        labelId = LabelResourceId.labelResourceId(4097);
+        pceStore.addGlobalNodeLabel(deviceId1, labelId);
+        labelId = LabelResourceId.labelResourceId(4098);
+        pceStore.addGlobalNodeLabel(deviceId2, labelId);
+        labelId = LabelResourceId.labelResourceId(4099);
+        pceStore.addGlobalNodeLabel(deviceId3, labelId);
+        labelId = LabelResourceId.labelResourceId(4100);
+        pceStore.addGlobalNodeLabel(deviceId4, labelId);
+        labelId = LabelResourceId.labelResourceId(4101);
+        pceStore.addGlobalNodeLabel(deviceId5, labelId);
+
+        // Allocate adjacency labels to each devices
+        labelId = LabelResourceId.labelResourceId(5122);
+        pceStore.addAdjLabel(link1, labelId);
+        labelId = LabelResourceId.labelResourceId(5123);
+        pceStore.addAdjLabel(link2, labelId);
+        labelId = LabelResourceId.labelResourceId(5124);
+        pceStore.addAdjLabel(link3, labelId);
+        labelId = LabelResourceId.labelResourceId(5125);
+        pceStore.addAdjLabel(link4, labelId);
+
+        // Compute label stack
+        LabelStack labelStack = srTeHandler.computeLabelStack(path1);
+
+        // check node-label of deviceId1
+        List<LabelResourceId> labelList = labelStack.labelResources();
+        Iterator<LabelResourceId> iterator = labelList.iterator();
+        labelId = (LabelResourceId) iterator.next();
+        assertThat(labelId, is(LabelResourceId.labelResourceId(4097)));
+
+        // check adjacency label of deviceId1
+        labelId = (LabelResourceId) iterator.next();
+        assertThat(labelId, is(LabelResourceId.labelResourceId(5122)));
+
+        // check node-label of deviceId2
+        labelId = (LabelResourceId) iterator.next();
+        assertThat(labelId, is(LabelResourceId.labelResourceId(4098)));
+
+        // check adjacency label of deviceId2
+        labelId = (LabelResourceId) iterator.next();
+        assertThat(labelId, is(LabelResourceId.labelResourceId(5123)));
+
+        // check node-label of deviceId3
+        labelId = (LabelResourceId) iterator.next();
+        assertThat(labelId, is(LabelResourceId.labelResourceId(4099)));
+
+        // check adjacency label of deviceId3
+        labelId = (LabelResourceId) iterator.next();
+        assertThat(labelId, is(LabelResourceId.labelResourceId(5124)));
+
+        // check node-label of deviceId4
+        labelId = (LabelResourceId) iterator.next();
+        assertThat(labelId, is(LabelResourceId.labelResourceId(4100)));
+
+        // check adjacency label of deviceId4
+        labelId = (LabelResourceId) iterator.next();
+        assertThat(labelId, is(LabelResourceId.labelResourceId(5125)));
+
+        // check node-label of deviceId5
+        labelId = (LabelResourceId) iterator.next();
+        assertThat(labelId, is(LabelResourceId.labelResourceId(4101)));
+    }
+}
diff --git a/apps/pce/app/src/test/java/org/onosproject/pce/util/LabelResourceAdapter.java b/apps/pce/app/src/test/java/org/onosproject/pce/util/LabelResourceAdapter.java
new file mode 100644
index 0000000..ca948b0
--- /dev/null
+++ b/apps/pce/app/src/test/java/org/onosproject/pce/util/LabelResourceAdapter.java
@@ -0,0 +1,189 @@
+/*
+ * 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.pce.util;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.util.Collection;
+import java.util.LinkedList;
+import java.util.Random;
+import java.util.Set;
+
+import org.onosproject.incubator.net.resource.label.DefaultLabelResource;
+import org.onosproject.incubator.net.resource.label.LabelResource;
+import org.onosproject.incubator.net.resource.label.LabelResourceAdminService;
+import org.onosproject.incubator.net.resource.label.LabelResourceDelegate;
+import org.onosproject.incubator.net.resource.label.LabelResourceEvent;
+import org.onosproject.incubator.net.resource.label.LabelResourceId;
+import org.onosproject.incubator.net.resource.label.LabelResourceListener;
+import org.onosproject.incubator.net.resource.label.LabelResourcePool;
+import org.onosproject.incubator.net.resource.label.LabelResourceProvider;
+import org.onosproject.incubator.net.resource.label.LabelResourceProviderRegistry;
+import org.onosproject.incubator.net.resource.label.LabelResourceProviderService;
+import org.onosproject.incubator.net.resource.label.LabelResourceService;
+import org.onosproject.net.Device;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.device.DeviceEvent;
+import org.onosproject.net.device.DeviceEvent.Type;
+import org.onosproject.net.device.DeviceListener;
+import org.onosproject.net.provider.AbstractListenerProviderRegistry;
+import org.onosproject.net.provider.AbstractProviderService;
+
+import com.google.common.collect.Multimap;
+
+/**
+ * Provides test implementation of class LabelResourceService.
+ */
+public class LabelResourceAdapter
+        extends AbstractListenerProviderRegistry<LabelResourceEvent, LabelResourceListener,
+                                                 LabelResourceProvider, LabelResourceProviderService>
+        implements LabelResourceService, LabelResourceAdminService, LabelResourceProviderRegistry {
+    public static final long GLOBAL_LABEL_SPACE_MIN = 4097;
+    public static final long GLOBAL_LABEL_SPACE_MAX = 5121;
+    public static final long LOCAL_LABEL_SPACE_MIN = 5122;
+    public static final long LOCAL_LABEL_SPACE_MAX = 9217;
+
+    private Random random = new Random();
+
+    @Override
+    public boolean createDevicePool(DeviceId deviceId,
+                                    LabelResourceId beginLabel,
+                                    LabelResourceId endLabel) {
+       return true;
+    }
+
+    @Override
+    public boolean createGlobalPool(LabelResourceId beginLabel,
+                                    LabelResourceId endLabel) {
+       return true;
+    }
+
+    @Override
+    public boolean destroyDevicePool(DeviceId deviceId) {
+       return true;
+    }
+
+    @Override
+    public boolean destroyGlobalPool() {
+       return true;
+    }
+
+    public long getLabelId(long min, long max) {
+      return random.nextInt((int) max - (int) min + 1) + (int) min;
+    }
+
+    public Collection<LabelResource> applyFromDevicePool(DeviceId deviceId,
+                                                  long applyNum) {
+        Collection<LabelResource> labelList = new LinkedList<>();
+        LabelResource label = new DefaultLabelResource(deviceId,
+                                  LabelResourceId.labelResourceId(
+                                  getLabelId(LOCAL_LABEL_SPACE_MIN, LOCAL_LABEL_SPACE_MAX)));
+        labelList.add(label);
+        return labelList;
+    }
+
+    public Collection<LabelResource> applyFromGlobalPool(long applyNum) {
+        Collection<LabelResource> labelList = new LinkedList<>();
+        LabelResource label = new DefaultLabelResource(DeviceId.deviceId("foo"),
+                                  LabelResourceId.labelResourceId(
+                                  getLabelId(GLOBAL_LABEL_SPACE_MIN, GLOBAL_LABEL_SPACE_MAX)));
+        labelList.add(label);
+        return labelList;
+    }
+
+    public boolean releaseToDevicePool(Multimap<DeviceId, LabelResource> release) {
+       return true;
+    }
+
+    public boolean releaseToGlobalPool(Set<LabelResourceId> release) {
+       return true;
+    }
+
+    public boolean isDevicePoolFull(DeviceId deviceId) {
+       return false;
+    }
+
+    public boolean isGlobalPoolFull() {
+       return false;
+    }
+
+    public long getFreeNumOfDevicePool(DeviceId deviceId) {
+       return 4;
+    }
+
+    public long getFreeNumOfGlobalPool() {
+       return 4;
+    }
+
+    @Override
+    public LabelResourcePool getDeviceLabelResourcePool(DeviceId deviceId) {
+       return null;
+    }
+
+    @Override
+    public LabelResourcePool getGlobalLabelResourcePool() {
+       return null;
+    }
+
+    private class InternalLabelResourceDelegate implements LabelResourceDelegate {
+        @Override
+        public void notify(LabelResourceEvent event) {
+            post(event);
+        }
+
+    }
+
+    private class InternalDeviceListener implements DeviceListener {
+        @Override
+        public void event(DeviceEvent event) {
+            Device device = event.subject();
+            if (Type.DEVICE_REMOVED.equals(event.type())) {
+                destroyDevicePool(device.id());
+            }
+        }
+    }
+
+    private class InternalLabelResourceProviderService
+            extends AbstractProviderService<LabelResourceProvider>
+            implements LabelResourceProviderService {
+
+        protected InternalLabelResourceProviderService(LabelResourceProvider provider) {
+            super(provider);
+        }
+
+        @Override
+        public void deviceLabelResourcePoolDetected(DeviceId deviceId,
+                                                    LabelResourceId beginLabel,
+                                                    LabelResourceId endLabel) {
+            checkNotNull(deviceId, "deviceId is not null");
+            checkNotNull(beginLabel, "beginLabel is not null");
+            checkNotNull(endLabel, "endLabel is not null");
+            createDevicePool(deviceId, beginLabel, endLabel);
+        }
+
+        @Override
+        public void deviceLabelResourcePoolDestroyed(DeviceId deviceId) {
+            checkNotNull(deviceId, "deviceId is not null");
+            destroyDevicePool(deviceId);
+        }
+
+    }
+
+    @Override
+    protected LabelResourceProviderService createProviderService(LabelResourceProvider provider) {
+        return null;
+    }
+}