diff --git a/incubator/api/src/test/java/org/onosproject/incubator/net/virtual/VirtualNetworkAdminServiceAdapter.java b/incubator/api/src/test/java/org/onosproject/incubator/net/virtual/VirtualNetworkAdminServiceAdapter.java
new file mode 100644
index 0000000..673d455
--- /dev/null
+++ b/incubator/api/src/test/java/org/onosproject/incubator/net/virtual/VirtualNetworkAdminServiceAdapter.java
@@ -0,0 +1,110 @@
+/*
+ * Copyright 2017-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.incubator.net.virtual;
+
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.VlanId;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.HostId;
+import org.onosproject.net.HostLocation;
+import org.onosproject.net.PortNumber;
+
+import java.util.Set;
+
+/**
+ * Test adapter for virtual network admin service.
+ */
+public class VirtualNetworkAdminServiceAdapter
+        extends VirtualNetworkServiceAdapter
+        implements VirtualNetworkAdminService {
+
+    @Override
+    public void registerTenantId(TenantId tenantId) {
+
+    }
+
+    @Override
+    public void unregisterTenantId(TenantId tenantId) {
+
+    }
+
+    @Override
+    public Set<TenantId> getTenantIds() {
+        return null;
+    }
+
+    @Override
+    public VirtualNetwork createVirtualNetwork(TenantId tenantId) {
+        return null;
+    }
+
+    @Override
+    public void removeVirtualNetwork(NetworkId networkId) {
+
+    }
+
+    @Override
+    public VirtualDevice createVirtualDevice(NetworkId networkId, DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public void removeVirtualDevice(NetworkId networkId, DeviceId deviceId) {
+
+    }
+
+    @Override
+    public VirtualHost createVirtualHost(NetworkId networkId, HostId hostId,
+                                         MacAddress mac, VlanId vlan,
+                                         HostLocation location, Set<IpAddress> ips) {
+        return null;
+    }
+
+    @Override
+    public void removeVirtualHost(NetworkId networkId, HostId hostId) {
+
+    }
+
+    @Override
+    public VirtualLink createVirtualLink(NetworkId networkId, ConnectPoint src, ConnectPoint dst) {
+        return null;
+    }
+
+    @Override
+    public void removeVirtualLink(NetworkId networkId, ConnectPoint src, ConnectPoint dst) {
+
+    }
+
+    @Override
+    public VirtualPort createVirtualPort(NetworkId networkId, DeviceId deviceId,
+                                         PortNumber portNumber, ConnectPoint realizedBy) {
+        return null;
+    }
+
+    @Override
+    public void bindVirtualPort(NetworkId networkId, DeviceId deviceId,
+                                PortNumber portNumber, ConnectPoint realizedBy) {
+
+    }
+
+    @Override
+    public void removeVirtualPort(NetworkId networkId, DeviceId deviceId, PortNumber portNumber) {
+
+    }
+}
diff --git a/incubator/api/src/test/java/org/onosproject/incubator/net/virtual/VirtualNetworkServiceAdapter.java b/incubator/api/src/test/java/org/onosproject/incubator/net/virtual/VirtualNetworkServiceAdapter.java
new file mode 100644
index 0000000..ebfd8da
--- /dev/null
+++ b/incubator/api/src/test/java/org/onosproject/incubator/net/virtual/VirtualNetworkServiceAdapter.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright 2017-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.incubator.net.virtual;
+
+import org.onlab.osgi.ServiceDirectory;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.net.DeviceId;
+
+import java.util.Set;
+
+/**
+ * Test adapter for virtual network service.
+ */
+public abstract class VirtualNetworkServiceAdapter implements VirtualNetworkService {
+    @Override
+    public void addListener(VirtualNetworkListener listener) {
+
+    }
+
+    @Override
+    public void removeListener(VirtualNetworkListener listener) {
+
+    }
+
+    @Override
+    public Set<VirtualNetwork> getVirtualNetworks(TenantId tenantId) {
+        return null;
+    }
+
+    @Override
+    public Set<VirtualDevice> getVirtualDevices(NetworkId networkId) {
+        return null;
+    }
+
+    @Override
+    public Set<VirtualHost> getVirtualHosts(NetworkId networkId) {
+        return null;
+    }
+
+    @Override
+    public Set<VirtualLink> getVirtualLinks(NetworkId networkId) {
+        return null;
+    }
+
+    @Override
+    public Set<VirtualPort> getVirtualPorts(NetworkId networkId, DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public Set<DeviceId> getPhysicalDevices(NetworkId networkId, VirtualDevice virtualDevice) {
+        return null;
+    }
+
+    @Override
+    public <T> T get(NetworkId networkId, Class<T> serviceClass) {
+        return null;
+    }
+
+    @Override
+    public ServiceDirectory getServiceDirectory() {
+        return null;
+    }
+
+    @Override
+    public ApplicationId getVirtualNetworkApplicationId(NetworkId networkId) {
+        return null;
+    }
+}
diff --git a/incubator/api/src/test/java/org/onosproject/incubator/net/virtual/event/AbstractVirtualListenerManagerTest.java b/incubator/api/src/test/java/org/onosproject/incubator/net/virtual/event/AbstractVirtualListenerManagerTest.java
index a7363be..299d8cb 100644
--- a/incubator/api/src/test/java/org/onosproject/incubator/net/virtual/event/AbstractVirtualListenerManagerTest.java
+++ b/incubator/api/src/test/java/org/onosproject/incubator/net/virtual/event/AbstractVirtualListenerManagerTest.java
@@ -22,22 +22,14 @@
 import org.junit.Before;
 import org.junit.Test;
 import org.onlab.osgi.ServiceDirectory;
-import org.onosproject.core.ApplicationId;
 import org.onosproject.event.AbstractEvent;
 import org.onosproject.event.Event;
 import org.onosproject.event.EventDeliveryService;
 import org.onosproject.event.EventListener;
 import org.onosproject.event.EventSink;
 import org.onosproject.incubator.net.virtual.NetworkId;
-import org.onosproject.incubator.net.virtual.TenantId;
-import org.onosproject.incubator.net.virtual.VirtualDevice;
-import org.onosproject.incubator.net.virtual.VirtualHost;
-import org.onosproject.incubator.net.virtual.VirtualLink;
-import org.onosproject.incubator.net.virtual.VirtualNetwork;
-import org.onosproject.incubator.net.virtual.VirtualNetworkListener;
 import org.onosproject.incubator.net.virtual.VirtualNetworkService;
-import org.onosproject.incubator.net.virtual.VirtualPort;
-import org.onosproject.net.DeviceId;
+import org.onosproject.incubator.net.virtual.VirtualNetworkServiceAdapter;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -254,7 +246,7 @@
         }
     }
 
-    private class TestVirtualNetworkManager implements VirtualNetworkService {
+    private class TestVirtualNetworkManager extends VirtualNetworkServiceAdapter {
         TestServiceDirectory serviceDirectory = new TestServiceDirectory();
 
         public TestVirtualNetworkManager() {
@@ -262,54 +254,9 @@
         }
 
         @Override
-        public Set<VirtualNetwork> getVirtualNetworks(TenantId tenantId) {
-            return null;
-        }
-
-        @Override
-        public Set<VirtualDevice> getVirtualDevices(NetworkId networkId) {
-            return null;
-        }
-
-        @Override
-        public Set<VirtualHost> getVirtualHosts(NetworkId networkId) {
-            return null;
-        }
-
-        @Override
-        public Set<VirtualLink> getVirtualLinks(NetworkId networkId) {
-            return null;
-        }
-
-        @Override
-        public Set<VirtualPort> getVirtualPorts(NetworkId networkId, DeviceId deviceId) {
-            return null;
-        }
-
-        @Override
-        public <T> T get(NetworkId networkId, Class<T> serviceClass) {
-            return null;
-        }
-
-        @Override
         public ServiceDirectory getServiceDirectory() {
             return serviceDirectory;
         }
-
-        @Override
-        public ApplicationId getVirtualNetworkApplicationId(NetworkId networkId) {
-            return null;
-        }
-
-        @Override
-        public void addListener(VirtualNetworkListener listener) {
-
-        }
-
-        @Override
-        public void removeListener(VirtualNetworkListener listener) {
-
-        }
     }
 
     private  class TestServiceDirectory implements ServiceDirectory {