diff --git a/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayConfigTest.java b/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayConfigTest.java
new file mode 100644
index 0000000..94a90c8
--- /dev/null
+++ b/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayConfigTest.java
@@ -0,0 +1,119 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * 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.opencord.dhcpl2relay.impl;
+
+import com.google.common.collect.ImmutableSet;
+import org.easymock.EasyMock;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.hamcrest.Matchers.is;
+import static org.junit.Assert.*;
+
+import org.onlab.junit.TestUtils;
+import org.onlab.osgi.ComponentContextAdapter;
+import org.onosproject.cfg.ComponentConfigService;
+import org.onosproject.common.event.impl.TestEventDispatcher;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.config.Config;
+import org.onosproject.net.config.NetworkConfigRegistryAdapter;
+import org.onosproject.net.flowobjective.FlowObjectiveServiceAdapter;
+
+import java.util.Set;
+
+/**
+ * Tests for DHCP relay app configuration.
+ */
+public class DhcpL2RelayConfigTest extends DhcpL2RelayTestBase {
+
+    static final boolean USE_OLT_ULPORT_FOR_PKT_INOUT = true;
+    static final boolean MODIFY_SRC_DST_MAC = true;
+
+    private DhcpL2Relay dhcpL2Relay;
+
+    ComponentConfigService mockConfigService =
+            EasyMock.createMock(ComponentConfigService.class);
+
+    /**
+     * Sets up the services required by the dhcpl2relay app.
+     */
+    @Before
+    public void setUp() {
+        dhcpL2Relay = new DhcpL2Relay();
+        dhcpL2Relay.cfgService = new TestNetworkConfigRegistry();
+        dhcpL2Relay.coreService = new MockCoreServiceAdapter();
+        dhcpL2Relay.flowObjectiveService = new FlowObjectiveServiceAdapter();
+        dhcpL2Relay.packetService = new MockPacketService();
+        dhcpL2Relay.componentConfigService = mockConfigService;
+        dhcpL2Relay.deviceService = new MockDeviceService();
+        dhcpL2Relay.sadisService = new MockSadisService();
+        dhcpL2Relay.hostService = new MockHostService();
+        dhcpL2Relay.mastershipService = new MockMastershipService();
+        TestUtils.setField(dhcpL2Relay, "eventDispatcher", new TestEventDispatcher());
+        dhcpL2Relay.activate(new ComponentContextAdapter());
+    }
+
+    /**
+     * Mocks the network config registry.
+     */
+    static class MockDhcpL2RelayConfig extends DhcpL2RelayConfig {
+        @Override
+        public Set<ConnectPoint> getDhcpServerConnectPoint() {
+            return ImmutableSet.of(SERVER_CONNECT_POINT);
+        }
+
+        @Override
+        public boolean getModifySrcDstMacAddresses() {
+            return true;
+        }
+
+        @Override
+        public boolean getUseOltUplinkForServerPktInOut() {
+            return true;
+        }
+    }
+
+    /**
+     * Tests the default configuration.
+     */
+    @Test
+    public void testConfig() {
+        assertThat(dhcpL2Relay.useOltUplink, is(USE_OLT_ULPORT_FOR_PKT_INOUT));
+        assertThat(dhcpL2Relay.modifyClientPktsSrcDstMac, is(MODIFY_SRC_DST_MAC));
+        assertNull(dhcpL2Relay.dhcpServerConnectPoint.get());
+    }
+
+    /**
+     * Tests if dhcpl2relay app has been configured.
+     */
+    @Test
+    public void testDhcpL2RelayConfigured() {
+        assertTrue(dhcpL2Relay.configured());
+    }
+
+    /**
+     * Mocks the network config registry.
+     */
+    @SuppressWarnings("unchecked")
+    static final class TestNetworkConfigRegistry
+            extends NetworkConfigRegistryAdapter {
+        @Override
+        public <S, C extends Config<S>> C getConfig(S subject, Class<C> configClass) {
+            DhcpL2RelayConfig dhcpConfig = new MockDhcpL2RelayConfig();
+            return (C) dhcpConfig;
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayCountersStoreTest.java b/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayCountersStoreTest.java
new file mode 100644
index 0000000..32bb0d3
--- /dev/null
+++ b/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayCountersStoreTest.java
@@ -0,0 +1,182 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * 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.opencord.dhcpl2relay.impl;
+
+import org.easymock.EasyMock;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.onlab.junit.TestUtils;
+import org.onlab.osgi.ComponentContextAdapter;
+import org.onosproject.cfg.ComponentConfigService;
+import org.onosproject.common.event.impl.TestEventDispatcher;
+import org.onosproject.net.flowobjective.FlowObjectiveServiceAdapter;
+import org.opencord.dhcpl2relay.DhcpL2RelayEvent;
+
+import java.util.Iterator;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.junit.Assert.assertEquals;
+
+
+public class DhcpL2RelayCountersStoreTest extends DhcpL2RelayTestBase {
+
+    private DhcpL2Relay dhcpL2Relay;
+    private SimpleDhcpL2RelayCountersStore store;
+
+    ComponentConfigService mockConfigService =
+            EasyMock.createMock(ComponentConfigService.class);
+
+    /**
+     * Sets up the services required by the dhcpl2relay app.
+     */
+    @Before
+    public void setUp() {
+        dhcpL2Relay = new DhcpL2Relay();
+        dhcpL2Relay.cfgService = new DhcpL2RelayConfigTest.TestNetworkConfigRegistry();
+        dhcpL2Relay.coreService = new MockCoreServiceAdapter();
+        dhcpL2Relay.flowObjectiveService = new FlowObjectiveServiceAdapter();
+        dhcpL2Relay.packetService = new MockPacketService();
+        dhcpL2Relay.componentConfigService = mockConfigService;
+        dhcpL2Relay.deviceService = new MockDeviceService();
+        dhcpL2Relay.sadisService = new MockSadisService();
+        dhcpL2Relay.mastershipService = new MockMastershipService();
+        TestUtils.setField(dhcpL2Relay, "eventDispatcher", new TestEventDispatcher());
+        dhcpL2Relay.activate(new ComponentContextAdapter());
+        store = new SimpleDhcpL2RelayCountersStore();
+        TestUtils.setField(store, "eventDispatcher", new TestEventDispatcher());
+        store.activate();
+        dhcpL2Relay.dhcpL2RelayCounters = this.store;
+    }
+
+    /**
+     * Tears down the dhcpL2Relay application.
+     */
+    @After
+    public void tearDown() {
+        dhcpL2Relay.deactivate();
+    }
+
+    /**
+     * Tests the initialization of the counter.
+     */
+    @Test
+    public void testInitCounter() {
+        // Init the supported global counter
+        dhcpL2Relay.dhcpL2RelayCounters.initCounters(DhcpL2RelayEvent.GLOBAL_COUNTER);
+        // Init the supported counter for a specific subscriber
+        dhcpL2Relay.dhcpL2RelayCounters.initCounters(CLIENT_ID_1);
+
+        Map<DhcpL2RelayCountersIdentifier, AtomicLong> countersMap = dhcpL2Relay.dhcpL2RelayCounters.getCountersMap();
+        for (Iterator<DhcpL2RelayCounters> it = DhcpL2RelayCounters.SUPPORTED_COUNTERS.iterator();
+             it.hasNext();) {
+            DhcpL2RelayCounters counterType = it.next();
+            long globalCounterValue = countersMap.get(new DhcpL2RelayCountersIdentifier(
+                    DhcpL2RelayEvent.GLOBAL_COUNTER, counterType)).longValue();
+            long perSubscriberValue = countersMap.get(new DhcpL2RelayCountersIdentifier(CLIENT_ID_1,
+                    counterType)).longValue();
+            assertEquals((long) 0, globalCounterValue);
+            assertEquals((long) 0, perSubscriberValue);
+        }
+    }
+
+    /**
+     * Tests the insertion of the counter entry if it is not already in the set
+     * otherwise increment the existing counter entry.
+     */
+    @Test
+    public void testIncrementCounter() {
+        // Init the supported global counter
+        dhcpL2Relay.dhcpL2RelayCounters.initCounters(DhcpL2RelayEvent.GLOBAL_COUNTER);
+
+        for (Iterator<DhcpL2RelayCounters> it = DhcpL2RelayCounters.SUPPORTED_COUNTERS.iterator();
+             it.hasNext();) {
+            DhcpL2RelayCounters counterType = it.next();
+            // Increment of existing supported global counter
+            dhcpL2Relay.dhcpL2RelayCounters.incrementCounter(DhcpL2RelayEvent.GLOBAL_COUNTER, counterType);
+            // Add of a Subscriber entry that is not already in the set
+            dhcpL2Relay.dhcpL2RelayCounters.incrementCounter(CLIENT_ID_1, counterType);
+        }
+
+        Map<DhcpL2RelayCountersIdentifier, AtomicLong> countersMap = dhcpL2Relay.dhcpL2RelayCounters.getCountersMap();
+        for (Iterator<DhcpL2RelayCounters> it = DhcpL2RelayCounters.SUPPORTED_COUNTERS.iterator();
+             it.hasNext();) {
+            DhcpL2RelayCounters counterType = it.next();
+            long globalCounterValue = countersMap.get(new DhcpL2RelayCountersIdentifier(
+                    DhcpL2RelayEvent.GLOBAL_COUNTER, counterType)).longValue();
+            long perSubscriberValue = countersMap.get(new DhcpL2RelayCountersIdentifier(CLIENT_ID_1,
+                    counterType)).longValue();
+            assertEquals((long) 1, globalCounterValue);
+            assertEquals((long) 1, perSubscriberValue);
+        }
+    }
+
+    /**
+     * Tests the increment and reset functions of the counters map for the given counter class.
+     */
+    @Test
+    public void testIncrementAndResetCounter() {
+        DhcpL2RelayCounters counterType;
+        long subscriberValue;
+        Map<DhcpL2RelayCountersIdentifier, AtomicLong> countersMap;
+
+        // First start incrementing the counter of a specific subscriber
+        for (Iterator<DhcpL2RelayCounters> it = DhcpL2RelayCounters.SUPPORTED_COUNTERS.iterator();
+             it.hasNext();) {
+            counterType = it.next();
+            // Insert of a Subscriber entry that is not already in the set
+            dhcpL2Relay.dhcpL2RelayCounters.incrementCounter(CLIENT_ID_1, counterType);
+        }
+
+        // Make sure that the counter is incremented
+        countersMap = dhcpL2Relay.dhcpL2RelayCounters.getCountersMap();
+        for (Iterator<DhcpL2RelayCounters> it = DhcpL2RelayCounters.SUPPORTED_COUNTERS.iterator();
+             it.hasNext();) {
+            counterType = it.next();
+            subscriberValue = countersMap.get(new DhcpL2RelayCountersIdentifier(CLIENT_ID_1,
+                    counterType)).longValue();
+            assertEquals((long) 1, subscriberValue);
+        }
+
+        // Reset the counter
+        dhcpL2Relay.dhcpL2RelayCounters.resetCounters(CLIENT_ID_1);
+        countersMap = dhcpL2Relay.dhcpL2RelayCounters.getCountersMap();
+        for (Iterator<DhcpL2RelayCounters> it = DhcpL2RelayCounters.SUPPORTED_COUNTERS.iterator();
+             it.hasNext();) {
+            counterType = it.next();
+            subscriberValue = countersMap.get(new DhcpL2RelayCountersIdentifier(CLIENT_ID_1,
+                    counterType)).longValue();
+            assertEquals((long) 0, subscriberValue);
+        }
+    }
+
+    /**
+     * Tests the insert of the counter value for a subscriber entry if it is not already in the set
+     * otherwise update the existing counter entry.
+     */
+    @Test
+    public void testInsertOrUpdateCounter() {
+        dhcpL2Relay.dhcpL2RelayCounters.setCounter(CLIENT_ID_1, DhcpL2RelayCounters.valueOf("DHCPDISCOVER"), (long) 50);
+
+        Map<DhcpL2RelayCountersIdentifier, AtomicLong> countersMap = dhcpL2Relay.dhcpL2RelayCounters.getCountersMap();
+        long subscriberValue = countersMap.get(new DhcpL2RelayCountersIdentifier(
+                CLIENT_ID_1, DhcpL2RelayCounters.valueOf("DHCPDISCOVER"))).longValue();
+
+        assertEquals((long) 50, subscriberValue);
+    }
+
+}
\ No newline at end of file
diff --git a/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayTest.java b/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayTest.java
index 17fb417..9841953 100755
--- a/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayTest.java
+++ b/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayTest.java
@@ -19,80 +19,33 @@
 
 import java.nio.ByteBuffer;
 import java.util.List;
-import java.util.Set;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.concurrent.TimeUnit;
 
 import org.easymock.EasyMock;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.onlab.junit.TestUtils;
-import org.onlab.osgi.ComponentContextAdapter;
-import org.onlab.packet.ChassisId;
 import org.onlab.packet.DHCP;
 import org.onlab.packet.Ethernet;
 import org.onlab.packet.IPv4;
-import org.onlab.packet.Ip4Address;
-import org.onlab.packet.IpAddress;
-import org.onlab.packet.MacAddress;
 import org.onlab.packet.UDP;
-import org.onlab.packet.VlanId;
 import org.onlab.packet.dhcp.DhcpOption;
-import org.onosproject.cfg.ComponentConfigService;
-import org.onosproject.common.event.impl.TestEventDispatcher;
-import org.onosproject.mastership.MastershipServiceAdapter;
-import org.onosproject.net.AnnotationKeys;
-import org.onosproject.net.Annotations;
-import org.onosproject.net.ConnectPoint;
-import org.onosproject.net.DefaultAnnotations;
-import org.onosproject.net.DefaultDevice;
-import org.onosproject.net.DefaultHost;
-import org.onosproject.net.Device;
-import org.onosproject.net.DeviceId;
-import org.onosproject.net.Element;
-import org.onosproject.net.Host;
-import org.onosproject.net.HostId;
-import org.onosproject.net.HostLocation;
-import org.onosproject.net.Port;
-import org.onosproject.net.PortNumber;
-import org.onosproject.net.config.Config;
-import org.onosproject.net.config.NetworkConfigRegistryAdapter;
-import org.onosproject.net.device.DeviceServiceAdapter;
-import org.onosproject.net.flowobjective.FlowObjectiveServiceAdapter;
-import org.onosproject.net.host.HostServiceAdapter;
-import org.onosproject.net.provider.ProviderId;
-import org.opencord.dhcpl2relay.impl.packet.DhcpOption82;
-import org.opencord.sadis.SubscriberAndDeviceInformation;
-import org.opencord.sadis.BandwidthProfileInformation;
-import org.opencord.sadis.BaseInformationService;
-import org.opencord.sadis.SadisService;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
-import com.google.common.collect.ImmutableSet;
+import org.onosproject.cfg.ComponentConfigService;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.flowobjective.FlowObjectiveServiceAdapter;
+import org.opencord.dhcpl2relay.DhcpL2RelayEvent;
+import org.opencord.dhcpl2relay.impl.packet.DhcpOption82;
+
 import com.google.common.collect.Lists;
 
 public class DhcpL2RelayTest extends DhcpL2RelayTestBase {
 
-    private final Logger log = LoggerFactory.getLogger(getClass());
-
     private DhcpL2Relay dhcpL2Relay;
-
-    private static final MacAddress CLIENT_MAC = MacAddress.valueOf("00:00:00:00:00:01");
-    private static final VlanId CLIENT_C_TAG = VlanId.vlanId((short) 999);
-    private static final VlanId CLIENT_S_TAG = VlanId.vlanId((short) 111);
-    private static final String CLIENT_NAS_PORT_ID = "PON 1/1";
-    private static final String CLIENT_CIRCUIT_ID = "CIR-PON 1/1";
-
-    private static final String OLT_DEV_ID = "of:00000000000000aa";
-    private static final MacAddress OLT_MAC_ADDRESS = MacAddress.valueOf("01:02:03:04:05:06");
-    private static final DeviceId DEVICE_ID_1 = DeviceId.deviceId(OLT_DEV_ID);
-
-    private static final ConnectPoint SERVER_CONNECT_POINT =
-            ConnectPoint.deviceConnectPoint("of:0000000000000001/5");
-
-    private static final String SCHEME_NAME = "dhcpl2relay";
-    private static final DefaultAnnotations DEVICE_ANNOTATIONS = DefaultAnnotations.builder()
-            .set(AnnotationKeys.PROTOCOL, SCHEME_NAME.toUpperCase()).build();
+    private SimpleDhcpL2RelayCountersStore store;
 
     ComponentConfigService mockConfigService =
             EasyMock.createMock(ComponentConfigService.class);
@@ -103,7 +56,7 @@
     @Before
     public void setUp() {
         dhcpL2Relay = new DhcpL2Relay();
-        dhcpL2Relay.cfgService = new TestNetworkConfigRegistry();
+        dhcpL2Relay.cfgService = new DhcpL2RelayConfigTest.TestNetworkConfigRegistry();
         dhcpL2Relay.coreService = new MockCoreServiceAdapter();
         dhcpL2Relay.flowObjectiveService = new FlowObjectiveServiceAdapter();
         dhcpL2Relay.packetService = new MockPacketService();
@@ -113,7 +66,12 @@
         dhcpL2Relay.hostService = new MockHostService();
         dhcpL2Relay.mastershipService = new MockMastershipService();
         TestUtils.setField(dhcpL2Relay, "eventDispatcher", new TestEventDispatcher());
-        dhcpL2Relay.activate(new ComponentContextAdapter());
+        dhcpL2Relay.refreshService = new MockExecutor(dhcpL2Relay.refreshService);
+        dhcpL2Relay.activate(new DhcpL2RelayTestBase.MockComponentContext());
+        store = new SimpleDhcpL2RelayCountersStore();
+        TestUtils.setField(store, "eventDispatcher", new TestEventDispatcher());
+        store.activate();
+        dhcpL2Relay.dhcpL2RelayCounters = this.store;
     }
 
     /**
@@ -132,7 +90,6 @@
     @Test
     public void testDhcpDiscover()  throws Exception {
         //  (1) Sending DHCP discover packet
-        System.out.println("Sending pakcet");
         Ethernet discoverPacket = constructDhcpDiscoverPacket(CLIENT_MAC);
 
         sendPacket(discoverPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
@@ -149,7 +106,6 @@
     @Test
     public void testDhcpRequest()  throws Exception {
         //  (1) Sending DHCP discover packet
-        System.out.println("Sending pakcet");
         Ethernet requestPacket = constructDhcpRequestPacket(CLIENT_MAC);
 
         sendPacket(requestPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
@@ -166,9 +122,8 @@
     @Test
     public void testDhcpOffer() {
         //  (1) Sending DHCP discover packet
-        System.out.println("Sending pakcet");
-        Ethernet offerPacket = constructDhcpOfferPacket(MacAddress.valueOf("bb:bb:bb:bb:bb:bb"),
-                CLIENT_MAC, "1.1.1.1", "2.2.2.2");
+        Ethernet offerPacket = constructDhcpOfferPacket(SERVER_MAC,
+                CLIENT_MAC, DESTINATION_ADDRESS_IP, DHCP_CLIENT_IP_ADDRESS);
 
         sendPacket(offerPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
 
@@ -184,8 +139,8 @@
     @Test
     public void testDhcpAck() {
 
-        Ethernet ackPacket = constructDhcpAckPacket(MacAddress.valueOf("bb:bb:bb:bb:bb:bb"),
-                CLIENT_MAC, "1.1.1.1", "2.2.2.2");
+        Ethernet ackPacket = constructDhcpAckPacket(SERVER_MAC,
+                CLIENT_MAC, DESTINATION_ADDRESS_IP, DHCP_CLIENT_IP_ADDRESS);
 
         sendPacket(ackPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
 
@@ -193,6 +148,95 @@
         compareServerPackets(ackPacket, ackRelayed);
     }
 
+    /**
+     * Tests the DHCP global counters.
+     */
+    @Test
+    public void testDhcpGlobalCounters() {
+        long discoveryValue = 0;
+        long offerValue = 0;
+        long requestValue = 0;
+        long ackValue = 0;
+
+        Ethernet discoverPacket = constructDhcpDiscoverPacket(CLIENT_MAC);
+        Ethernet offerPacket = constructDhcpOfferPacket(SERVER_MAC,
+                CLIENT_MAC, DESTINATION_ADDRESS_IP, DHCP_CLIENT_IP_ADDRESS);
+        Ethernet requestPacket = constructDhcpRequestPacket(CLIENT_MAC);
+        Ethernet ackPacket = constructDhcpAckPacket(SERVER_MAC,
+                CLIENT_MAC, DESTINATION_ADDRESS_IP, DHCP_CLIENT_IP_ADDRESS);
+
+        sendPacket(discoverPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
+        sendPacket(offerPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
+        sendPacket(requestPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
+        sendPacket(ackPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
+
+        Map<DhcpL2RelayCountersIdentifier, AtomicLong> countersMap = dhcpL2Relay.dhcpL2RelayCounters.getCountersMap();
+        discoveryValue = countersMap.get(new DhcpL2RelayCountersIdentifier(DhcpL2RelayEvent.GLOBAL_COUNTER,
+                DhcpL2RelayCounters.valueOf("DHCPDISCOVER"))).longValue();
+        offerValue = countersMap.get(new DhcpL2RelayCountersIdentifier(DhcpL2RelayEvent.GLOBAL_COUNTER,
+                DhcpL2RelayCounters.valueOf("DHCPOFFER"))).longValue();
+        requestValue = countersMap.get(new DhcpL2RelayCountersIdentifier(DhcpL2RelayEvent.GLOBAL_COUNTER,
+                DhcpL2RelayCounters.valueOf("DHCPREQUEST"))).longValue();
+        ackValue = countersMap.get(new DhcpL2RelayCountersIdentifier(DhcpL2RelayEvent.GLOBAL_COUNTER,
+                DhcpL2RelayCounters.valueOf("DHCPACK"))).longValue();
+
+        assertEquals((long) 1, discoveryValue);
+        assertEquals((long) 1, offerValue);
+        assertEquals((long) 1, requestValue);
+        assertEquals((long) 1, ackValue);
+    }
+
+    /**
+     * Tests the DHCP per subscriber counters.
+     *
+     */
+    @Test
+    public void testDhcpPerSubscriberCounters() {
+        long discoveryValue;
+        long offerValue;
+        long requestValue;
+        long ackValue;
+
+        Ethernet discoverPacket = constructDhcpDiscoverPacket(CLIENT_MAC);
+        Ethernet offerPacket = constructDhcpOfferPacket(SERVER_MAC,
+                CLIENT_MAC, DESTINATION_ADDRESS_IP, DHCP_CLIENT_IP_ADDRESS);
+        Ethernet requestPacket = constructDhcpRequestPacket(CLIENT_MAC);
+        Ethernet ackPacket = constructDhcpAckPacket(SERVER_MAC,
+                CLIENT_MAC, DESTINATION_ADDRESS_IP, DHCP_CLIENT_IP_ADDRESS);
+
+        sendPacket(discoverPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
+        sendPacket(offerPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
+        sendPacket(requestPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
+        sendPacket(ackPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
+
+        Map<DhcpL2RelayCountersIdentifier, AtomicLong> countersMap = dhcpL2Relay.dhcpL2RelayCounters.getCountersMap();
+        discoveryValue = countersMap.get(new DhcpL2RelayCountersIdentifier(CLIENT_ID_1,
+                DhcpL2RelayCounters.valueOf("DHCPDISCOVER"))).longValue();
+        offerValue = countersMap.get(new DhcpL2RelayCountersIdentifier(CLIENT_ID_1,
+                DhcpL2RelayCounters.valueOf("DHCPOFFER"))).longValue();
+        requestValue = countersMap.get(new DhcpL2RelayCountersIdentifier(CLIENT_ID_1,
+                DhcpL2RelayCounters.valueOf("DHCPREQUEST"))).longValue();
+        ackValue = countersMap.get(new DhcpL2RelayCountersIdentifier(CLIENT_ID_1,
+                DhcpL2RelayCounters.valueOf("DHCPACK"))).longValue();
+
+        assertEquals((long) 1, discoveryValue);
+        assertEquals((long) 1, offerValue);
+        assertEquals((long) 1, requestValue);
+        assertEquals((long) 1, ackValue);
+    }
+
+    /**
+     * Tests the schedule function to publish the counters to kafka.
+     *
+     */
+    @Test
+    public void testSchedulePublishCountersToKafka() {
+        MockExecutor executor = new MockExecutor(dhcpL2Relay.refreshService);
+        dhcpL2Relay.refreshTask = executor.scheduleWithFixedDelay(
+                dhcpL2Relay.publishCountersToKafka, 0, 10, TimeUnit.SECONDS);
+        executor.assertLastMethodCalled("scheduleWithFixedDelay", 0, 10, TimeUnit.SECONDS);
+    }
+
     public void compareClientPackets(Ethernet sent, Ethernet relayed) {
         sent.setSourceMACAddress(OLT_MAC_ADDRESS);
         sent.setQinQVID(CLIENT_S_TAG.toShort());
@@ -232,202 +276,4 @@
         assertEquals(expectedPacket, relayed);
 
     }
-
-    private class MockDevice extends DefaultDevice {
-
-        public MockDevice(ProviderId providerId, DeviceId id, Type type,
-                          String manufacturer, String hwVersion, String swVersion,
-                          String serialNumber, ChassisId chassisId, Annotations... annotations) {
-            super(providerId, id, type, manufacturer, hwVersion, swVersion, serialNumber,
-                    chassisId, annotations);
-        }
-    }
-
-    private class MockDeviceService extends DeviceServiceAdapter {
-
-        private ProviderId providerId = new ProviderId("of", "foo");
-        private final Device device1 = new MockDevice(providerId, DEVICE_ID_1, Device.Type.SWITCH,
-                "foo.inc", "0", "0", OLT_DEV_ID, new ChassisId(),
-                DEVICE_ANNOTATIONS);
-
-        @Override
-        public Device getDevice(DeviceId devId) {
-            return device1;
-
-        }
-
-        @Override
-        public Port getPort(ConnectPoint cp) {
-            return new MockPort();
-        }
-
-        @Override
-        public boolean isAvailable(DeviceId d) {
-            return true;
-        }
-    }
-
-    private class  MockPort implements Port {
-
-        @Override
-        public boolean isEnabled() {
-            return true;
-        }
-        @Override
-        public long portSpeed() {
-            return 1000;
-        }
-        @Override
-        public Element element() {
-            return null;
-        }
-        @Override
-        public PortNumber number() {
-            return null;
-        }
-        @Override
-        public Annotations annotations() {
-            return new MockAnnotations();
-        }
-        @Override
-        public Type type() {
-            return Port.Type.FIBER;
-        }
-
-        private class MockAnnotations implements Annotations {
-
-            @Override
-            public String value(String val) {
-                return "PON 1/1";
-            }
-            @Override
-            public Set<String> keys() {
-                return null;
-            }
-        }
-    }
-
-    private class MockSadisService implements SadisService {
-        @Override
-        public BaseInformationService<SubscriberAndDeviceInformation> getSubscriberInfoService() {
-            return new MockSubService();
-        }
-
-        @Override
-        public BaseInformationService<BandwidthProfileInformation> getBandwidthProfileService() {
-            return null;
-        }
-    }
-
-    private class MockSubService implements BaseInformationService<SubscriberAndDeviceInformation> {
-        MockSubscriberAndDeviceInformation device =
-                new MockSubscriberAndDeviceInformation(OLT_DEV_ID, VlanId.NONE, VlanId.NONE, null, null,
-                        OLT_MAC_ADDRESS, Ip4Address.valueOf("10.10.10.10"));
-        MockSubscriberAndDeviceInformation sub =
-                new MockSubscriberAndDeviceInformation(CLIENT_NAS_PORT_ID, CLIENT_C_TAG,
-                        CLIENT_S_TAG, CLIENT_NAS_PORT_ID, CLIENT_CIRCUIT_ID, null, null);
-        @Override
-        public SubscriberAndDeviceInformation get(String id) {
-            if (id.equals(OLT_DEV_ID)) {
-                return device;
-            } else {
-                return  sub;
-            }
-        }
-
-        @Override
-        public void invalidateAll() {}
-        @Override
-        public void invalidateId(String id) {}
-        @Override
-        public SubscriberAndDeviceInformation getfromCache(String id) {
-            return null;
-        }
-    }
-
-    private class MockMastershipService extends MastershipServiceAdapter {
-        @Override
-        public boolean isLocalMaster(DeviceId d) {
-            return true;
-        }
-    }
-
-    private class MockSubscriberAndDeviceInformation extends SubscriberAndDeviceInformation {
-
-        MockSubscriberAndDeviceInformation(String id, VlanId ctag,
-                                           VlanId stag, String nasPortId,
-                                           String circuitId, MacAddress hardId,
-                                           Ip4Address ipAddress) {
-            this.setCTag(ctag);
-            this.setHardwareIdentifier(hardId);
-            this.setId(id);
-            this.setIPAddress(ipAddress);
-            this.setSTag(stag);
-            this.setNasPortId(nasPortId);
-            this.setCircuitId(circuitId);
-        }
-    }
-
-    private class MockHostService extends HostServiceAdapter {
-
-        @Override
-        public Set<Host> getHostsByMac(MacAddress mac) {
-
-            HostLocation loc = new HostLocation(DEVICE_ID_1, PortNumber.portNumber(22), 0);
-
-            IpAddress ip = IpAddress.valueOf("10.100.200.10");
-
-            Host h = new DefaultHost(ProviderId.NONE, HostId.hostId(mac, VlanId.NONE),
-                    mac, VlanId.NONE, loc, ImmutableSet.of(ip));
-
-            return ImmutableSet.of(h);
-        }
-    }
-
-
-    /**
-     * Mocks the AAAConfig class to force usage of an unroutable address for the
-     * RADIUS server.
-     */
-    static class MockDhcpL2RealyConfig extends DhcpL2RelayConfig {
-        @Override
-        public Set<ConnectPoint> getDhcpServerConnectPoint() {
-            return ImmutableSet.of(SERVER_CONNECT_POINT);
-        }
-
-        @Override
-        public boolean getModifySrcDstMacAddresses() {
-            return true;
-        }
-    }
-
-    /**
-     * Mocks the network config registry.
-     */
-    @SuppressWarnings("unchecked")
-    private static final class TestNetworkConfigRegistry
-            extends NetworkConfigRegistryAdapter {
-        @Override
-        public <S, C extends Config<S>> C getConfig(S subject, Class<C> configClass) {
-            DhcpL2RelayConfig dhcpConfig = new MockDhcpL2RealyConfig();
-            return (C) dhcpConfig;
-        }
-    }
-}
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
+}
\ No newline at end of file
diff --git a/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayTestBase.java b/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayTestBase.java
index a389ba4..bae3575 100755
--- a/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayTestBase.java
+++ b/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayTestBase.java
@@ -16,18 +16,63 @@
 
 package org.opencord.dhcpl2relay.impl;
 
+import static com.google.common.base.Preconditions.checkState;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Dictionary;
+import java.util.Hashtable;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeoutException;
+import java.util.concurrent.TimeUnit;
+
+import com.google.common.collect.ImmutableSet;
 import org.onlab.packet.BasePacket;
+import org.onlab.packet.ChassisId;
 import org.onlab.packet.DHCP;
 import org.onlab.packet.Ethernet;
 import org.onlab.packet.IPv4;
+import org.onlab.packet.IpAddress;
 import org.onlab.packet.Ip4Address;
 import org.onlab.packet.MacAddress;
 import org.onlab.packet.UDP;
+import org.onlab.packet.VlanId;
 import org.onlab.packet.dhcp.DhcpOption;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.core.CoreServiceAdapter;
 import org.onosproject.core.DefaultApplicationId;
+import org.onosproject.event.DefaultEventSinkRegistry;
+import org.onosproject.event.Event;
+import org.onosproject.event.EventDeliveryService;
+import org.onosproject.event.EventSink;
+import org.onosproject.mastership.MastershipServiceAdapter;
+import org.onosproject.net.AnnotationKeys;
+import org.onosproject.net.Annotations;
 import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.net.DefaultDevice;
+import org.onosproject.net.DefaultHost;
+import org.onosproject.net.Device;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Element;
+import org.onosproject.net.Host;
+import org.onosproject.net.HostId;
+import org.onosproject.net.HostLocation;
+import org.onosproject.net.Port;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.device.DeviceServiceAdapter;
+import org.onosproject.net.host.HostServiceAdapter;
 import org.onosproject.net.packet.DefaultInboundPacket;
 import org.onosproject.net.packet.DefaultPacketContext;
 import org.onosproject.net.packet.InboundPacket;
@@ -35,17 +80,19 @@
 import org.onosproject.net.packet.PacketContext;
 import org.onosproject.net.packet.PacketProcessor;
 import org.onosproject.net.packet.PacketServiceAdapter;
+import org.onosproject.net.provider.ProviderId;
+import org.opencord.sadis.BandwidthProfileInformation;
+import org.opencord.sadis.BaseInformationService;
+import org.opencord.sadis.SadisService;
+import org.opencord.sadis.SubscriberAndDeviceInformation;
+import org.osgi.framework.Bundle;
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.ServiceReference;
+import org.osgi.service.component.ComponentContext;
+import org.osgi.service.component.ComponentInstance;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.nio.ByteBuffer;
-import java.nio.charset.StandardCharsets;
-import java.util.ArrayList;
-import java.util.LinkedList;
-import java.util.List;
-
-import static org.junit.Assert.fail;
-
 
 /**
  * Common methods for AAA app testing.
@@ -53,9 +100,30 @@
 public class DhcpL2RelayTestBase {
     private final Logger log = LoggerFactory.getLogger(getClass());
 
-    private static final int TRANSACTION_ID = 1000;
+    static final VlanId CLIENT_C_TAG = VlanId.vlanId((short) 999);
+    static final VlanId CLIENT_S_TAG = VlanId.vlanId((short) 111);
+    static final String CLIENT_ID_1 = "SUBSCRIBER_ID_1";
+    static final String CLIENT_NAS_PORT_ID = "PON 1/1";
+    static final String CLIENT_CIRCUIT_ID = "CIR-PON 1/1";
 
-    private static final String EXPECTED_IP = "10.2.0.2";
+    static final MacAddress CLIENT_MAC = MacAddress.valueOf("00:00:00:00:00:01");
+    static final MacAddress SERVER_MAC = MacAddress.valueOf("bb:bb:bb:bb:bb:bb");
+    static final String DESTINATION_ADDRESS_IP = "1.1.1.1";
+    static final String DHCP_CLIENT_IP_ADDRESS = "2.2.2.2";
+    static final int UPLINK_PORT = 5;
+
+    static final String EXPECTED_IP = "10.2.0.2";
+    static final String OLT_DEV_ID = "of:00000000000000aa";
+    static final DeviceId DEVICE_ID_1 = DeviceId.deviceId(OLT_DEV_ID);
+    static final int TRANSACTION_ID = 1000;
+    static final String SCHEME_NAME = "dhcpl2relay";
+    static final MacAddress OLT_MAC_ADDRESS = MacAddress.valueOf("01:02:03:04:05:06");
+
+    static final ConnectPoint SERVER_CONNECT_POINT =
+            ConnectPoint.deviceConnectPoint("of:00000000000000aa/5");
+
+    static final DefaultAnnotations DEVICE_ANNOTATIONS = DefaultAnnotations.builder()
+            .set(AnnotationKeys.PROTOCOL, SCHEME_NAME.toUpperCase()).build();
 
     List<BasePacket> savedPackets = new LinkedList<>();
     PacketProcessor packetProcessor;
@@ -85,6 +153,108 @@
         }
     }
 
+    class MockDeviceService extends DeviceServiceAdapter {
+
+        private ProviderId providerId = new ProviderId("of", "foo");
+        private final Device device1 = new DhcpL2RelayTestBase.MockDevice(providerId, DEVICE_ID_1, Device.Type.SWITCH,
+                "foo.inc", "0", "0", OLT_DEV_ID, new ChassisId(),
+                DEVICE_ANNOTATIONS);
+
+        @Override
+        public Device getDevice(DeviceId devId) {
+            return device1;
+
+        }
+
+        @Override
+        public Port getPort(ConnectPoint cp) {
+            return new DhcpL2RelayTestBase.MockPort();
+        }
+
+        @Override
+        public Port getPort(DeviceId deviceId, PortNumber portNumber) {
+            return new DhcpL2RelayTestBase.MockPort();
+        }
+
+        @Override
+        public boolean isAvailable(DeviceId d) {
+            return true;
+        }
+    }
+
+    class MockDevice extends DefaultDevice {
+
+        public MockDevice(ProviderId providerId, DeviceId id, Type type,
+                          String manufacturer, String hwVersion, String swVersion,
+                          String serialNumber, ChassisId chassisId, Annotations... annotations) {
+            super(providerId, id, type, manufacturer, hwVersion, swVersion, serialNumber,
+                    chassisId, annotations);
+        }
+    }
+
+    class MockHostService extends HostServiceAdapter {
+
+        @Override
+        public Set<Host> getHostsByMac(MacAddress mac) {
+
+            HostLocation loc = new HostLocation(DEVICE_ID_1, PortNumber.portNumber(22), 0);
+
+            IpAddress ip = IpAddress.valueOf("10.100.200.10");
+
+            Host h = new DefaultHost(ProviderId.NONE, HostId.hostId(mac, VlanId.NONE),
+                    mac, VlanId.NONE, loc, ImmutableSet.of(ip));
+
+            return ImmutableSet.of(h);
+        }
+    }
+
+    class MockMastershipService extends MastershipServiceAdapter {
+        @Override
+        public boolean isLocalMaster(DeviceId d) {
+            return true;
+        }
+    }
+
+    class  MockPort implements Port {
+
+        @Override
+        public boolean isEnabled() {
+            return true;
+        }
+        @Override
+        public long portSpeed() {
+            return 1000;
+        }
+        @Override
+        public Element element() {
+            return null;
+        }
+        @Override
+        public PortNumber number() {
+            return null;
+        }
+        @Override
+        public Annotations annotations() {
+            return new MockAnnotations();
+        }
+        @Override
+        public Type type() {
+            return Port.Type.FIBER;
+        }
+
+        private class MockAnnotations implements Annotations {
+
+            @Override
+            public String value(String val) {
+                return "PON 1/1";
+            }
+            @Override
+            public Set<String> keys() {
+                return null;
+            }
+        }
+    }
+
     /**
      * Keeps a reference to the PacketProcessor and saves the OutboundPackets.
      */
@@ -107,6 +277,124 @@
         }
     }
 
+    class MockSadisService implements SadisService {
+        @Override
+        public BaseInformationService<SubscriberAndDeviceInformation> getSubscriberInfoService() {
+            return new DhcpL2RelayTestBase.MockSubService();
+        }
+
+        @Override
+        public BaseInformationService<BandwidthProfileInformation> getBandwidthProfileService() {
+            return null;
+        }
+    }
+
+    class MockSubService implements BaseInformationService<SubscriberAndDeviceInformation> {
+        DhcpL2RelayTestBase.MockSubscriberAndDeviceInformation device =
+                new DhcpL2RelayTestBase.MockSubscriberAndDeviceInformation(OLT_DEV_ID, VlanId.NONE, VlanId.NONE, null,
+                        null, OLT_MAC_ADDRESS, Ip4Address.valueOf("10.10.10.10"), UPLINK_PORT);
+        DhcpL2RelayTestBase.MockSubscriberAndDeviceInformation sub =
+                new DhcpL2RelayTestBase.MockSubscriberAndDeviceInformation(CLIENT_ID_1, CLIENT_C_TAG,
+                        CLIENT_S_TAG, CLIENT_NAS_PORT_ID, CLIENT_CIRCUIT_ID, null, null, -1);
+        @Override
+        public SubscriberAndDeviceInformation get(String id) {
+            if (id.equals(OLT_DEV_ID)) {
+                return device;
+            } else {
+                return  sub;
+            }
+        }
+
+        @Override
+        public void invalidateAll() {}
+        @Override
+        public void invalidateId(String id) {}
+        @Override
+        public SubscriberAndDeviceInformation getfromCache(String id) {
+            return null;
+        }
+    }
+
+    class MockSubscriberAndDeviceInformation extends SubscriberAndDeviceInformation {
+
+        MockSubscriberAndDeviceInformation(String id, VlanId ctag,
+                                           VlanId stag, String nasPortId,
+                                           String circuitId, MacAddress hardId,
+                                           Ip4Address ipAddress, int uplinkPort) {
+            this.setCTag(ctag);
+            this.setHardwareIdentifier(hardId);
+            this.setId(id);
+            this.setIPAddress(ipAddress);
+            this.setSTag(stag);
+            this.setNasPortId(nasPortId);
+            this.setCircuitId(circuitId);
+            this.setUplinkPort(uplinkPort);
+        }
+    }
+
+    class MockComponentContext implements ComponentContext {
+
+        @Override
+        public Dictionary<String, Object> getProperties() {
+            Dictionary<String, Object> cfgDict = new Hashtable<String, Object>();
+            cfgDict.put("publishCountersRate", 10);
+            return cfgDict;
+        }
+
+        @Override
+        public Object locateService(String name) {
+            // TODO Auto-generated method stub
+            return null;
+        }
+
+        @Override
+        public Object locateService(String name, ServiceReference reference) {
+            // TODO Auto-generated method stub
+            return null;
+        }
+
+        @Override
+        public Object[] locateServices(String name) {
+            // TODO Auto-generated method stub
+            return null;
+        }
+
+        @Override
+        public BundleContext getBundleContext() {
+            // TODO Auto-generated method stub
+            return null;
+        }
+
+        @Override
+        public Bundle getUsingBundle() {
+            // TODO Auto-generated method stub
+            return null;
+        }
+
+        @Override
+        public ComponentInstance getComponentInstance() {
+            // TODO Auto-generated method stub
+            return null;
+        }
+
+        @Override
+        public void enableComponent(String name) {
+            // TODO Auto-generated method stub
+        }
+
+        @Override
+        public void disableComponent(String name) {
+            // TODO Auto-generated method stub
+        }
+
+        @Override
+        public ServiceReference getServiceReference() {
+            // TODO Auto-generated method stub
+            return null;
+        }
+    }
+
+
     /**
      * Mocks the DefaultPacketContext.
      */
@@ -123,6 +411,157 @@
         }
     }
 
+    public static class TestEventDispatcher extends DefaultEventSinkRegistry
+            implements EventDeliveryService {
+        @Override
+        @SuppressWarnings("unchecked")
+        public synchronized void post(Event event) {
+            EventSink sink = getSink(event.getClass());
+            checkState(sink != null, "No sink for event %s", event);
+            sink.process(event);
+        }
+
+        @Override
+        public void setDispatchTimeLimit(long millis) {
+        }
+
+        @Override
+        public long getDispatchTimeLimit() {
+            return 0;
+        }
+    }
+
+    /**
+     * Creates a mock object for a scheduled executor service.
+     *
+     */
+    public static final class MockExecutor implements ScheduledExecutorService {
+        private ScheduledExecutorService executor;
+
+        MockExecutor(ScheduledExecutorService executor) {
+            this.executor = executor;
+        }
+
+        String lastMethodCalled = "";
+        long lastInitialDelay;
+        long lastDelay;
+        TimeUnit lastUnit;
+
+        public void assertLastMethodCalled(String method, long initialDelay, long delay, TimeUnit unit) {
+            assertEquals(method, lastMethodCalled);
+            assertEquals(initialDelay, lastInitialDelay);
+            assertEquals(delay, lastDelay);
+            assertEquals(unit, lastUnit);
+        }
+
+        @Override
+        public ScheduledFuture<?> schedule(Runnable command, long delay, TimeUnit unit) {
+            lastMethodCalled = "scheduleRunnable";
+            lastDelay = delay;
+            lastUnit = unit;
+            return null;
+        }
+
+        @Override
+        public <V> ScheduledFuture<V> schedule(Callable<V> callable, long delay, TimeUnit unit) {
+            lastMethodCalled = "scheduleCallable";
+            lastDelay = delay;
+            lastUnit = unit;
+            return null;
+        }
+
+        @Override
+        public ScheduledFuture<?> scheduleAtFixedRate(
+                Runnable command, long initialDelay, long period, TimeUnit unit) {
+            lastMethodCalled = "scheduleAtFixedRate";
+            lastInitialDelay = initialDelay;
+            lastDelay = period;
+            lastUnit = unit;
+            return null;
+        }
+
+        @Override
+        public ScheduledFuture<?> scheduleWithFixedDelay(
+                Runnable command, long initialDelay, long delay, TimeUnit unit) {
+            lastMethodCalled = "scheduleWithFixedDelay";
+            lastInitialDelay = initialDelay;
+            lastDelay = delay;
+            lastUnit = unit;
+            command.run();
+            return null;
+        }
+
+        @Override
+        public boolean awaitTermination(long timeout, TimeUnit unit) {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks)
+                throws InterruptedException {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public <T> List<Future<T>> invokeAll(
+                Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)
+                throws InterruptedException {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public <T> T invokeAny(Collection<? extends Callable<T>> tasks)
+                throws ExecutionException, InterruptedException {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public <T> T invokeAny(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)
+                throws ExecutionException, InterruptedException, TimeoutException {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public boolean isShutdown() {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public boolean isTerminated() {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public void shutdown() {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public List<Runnable> shutdownNow() {
+            return null;
+        }
+
+        @Override
+        public <T> Future<T> submit(Callable<T> task) {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public Future<?> submit(Runnable task) {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public <T> Future<T> submit(Runnable task, T result) {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public void execute(Runnable command) {
+            throw new UnsupportedOperationException();
+        }
+    }
+
     /**
      * Sends an Ethernet packet to the process method of the Packet Processor.
      *
@@ -307,4 +746,4 @@
 
         return optionList;
     }
-}
+}
\ No newline at end of file