diff --git a/core/api/src/test/java/org/onosproject/core/CoreServiceAdapter.java b/core/api/src/test/java/org/onosproject/core/CoreServiceAdapter.java
new file mode 100644
index 0000000..cd9db3f
--- /dev/null
+++ b/core/api/src/test/java/org/onosproject/core/CoreServiceAdapter.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2015 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.core;
+
+import java.util.Set;
+
+/**
+ * Test adapter for core service.
+ */
+public class CoreServiceAdapter implements CoreService {
+    @Override
+    public Version version() {
+        return null;
+    }
+
+    @Override
+    public Set<ApplicationId> getAppIds() {
+        return null;
+    }
+
+    @Override
+    public ApplicationId getAppId(Short id) {
+        return null;
+    }
+
+    @Override
+    public ApplicationId registerApplication(String identifier) {
+        return null;
+    }
+
+    @Override
+    public IdGenerator getIdGenerator(String topic) {
+        return null;
+    }
+}
diff --git a/core/api/src/test/java/org/onosproject/net/device/DeviceServiceAdapter.java b/core/api/src/test/java/org/onosproject/net/device/DeviceServiceAdapter.java
index b05f17d..ccd4a6d 100644
--- a/core/api/src/test/java/org/onosproject/net/device/DeviceServiceAdapter.java
+++ b/core/api/src/test/java/org/onosproject/net/device/DeviceServiceAdapter.java
@@ -15,15 +15,14 @@
  */
 package org.onosproject.net.device;
 
+import com.google.common.base.Predicate;
+import com.google.common.collect.FluentIterable;
 import org.onosproject.net.Device;
 import org.onosproject.net.DeviceId;
 import org.onosproject.net.MastershipRole;
 import org.onosproject.net.Port;
 import org.onosproject.net.PortNumber;
 
-import com.google.common.base.Predicate;
-import com.google.common.collect.FluentIterable;
-
 import java.util.List;
 
 /**
diff --git a/core/api/src/test/java/org/onosproject/net/flow/FlowRuleServiceAdapter.java b/core/api/src/test/java/org/onosproject/net/flow/FlowRuleServiceAdapter.java
new file mode 100644
index 0000000..8f54e85
--- /dev/null
+++ b/core/api/src/test/java/org/onosproject/net/flow/FlowRuleServiceAdapter.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2015 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.net.flow;
+
+import org.onosproject.core.ApplicationId;
+import org.onosproject.net.DeviceId;
+
+import java.util.concurrent.Future;
+
+/**
+ * Test adapter for flow rule service.
+ */
+public class FlowRuleServiceAdapter implements FlowRuleService {
+    @Override
+    public int getFlowRuleCount() {
+        return 0;
+    }
+
+    @Override
+    public Iterable<FlowEntry> getFlowEntries(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public void applyFlowRules(FlowRule... flowRules) {
+
+    }
+
+    @Override
+    public void removeFlowRules(FlowRule... flowRules) {
+
+    }
+
+    @Override
+    public void removeFlowRulesById(ApplicationId appId) {
+
+    }
+
+    @Override
+    public Iterable<FlowRule> getFlowRulesById(ApplicationId id) {
+        return null;
+    }
+
+    @Override
+    public Iterable<FlowRule> getFlowRulesByGroupId(ApplicationId appId, short groupId) {
+        return null;
+    }
+
+    @Override
+    public Future<CompletedBatchOperation> applyBatch(FlowRuleBatchOperation batch) {
+        return null;
+    }
+
+    @Override
+    public void addListener(FlowRuleListener listener) {
+
+    }
+
+    @Override
+    public void removeListener(FlowRuleListener listener) {
+
+    }
+}
diff --git a/core/api/src/test/java/org/onosproject/net/intent/IntentServiceAdapter.java b/core/api/src/test/java/org/onosproject/net/intent/IntentServiceAdapter.java
new file mode 100644
index 0000000..335d9f1
--- /dev/null
+++ b/core/api/src/test/java/org/onosproject/net/intent/IntentServiceAdapter.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2015 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.net.intent;
+
+import java.util.List;
+
+/**
+ *  Test adapter for intent service.
+ */
+public class IntentServiceAdapter implements IntentService {
+    @Override
+    public void submit(Intent intent) {
+
+    }
+
+    @Override
+    public void withdraw(Intent intent) {
+
+    }
+
+    @Override
+    public void replace(IntentId oldIntentId, Intent newIntent) {
+
+    }
+
+    @Override
+    public void execute(IntentOperations operations) {
+
+    }
+
+    @Override
+    public Iterable<Intent> getIntents() {
+        return null;
+    }
+
+    @Override
+    public long getIntentCount() {
+        return 0;
+    }
+
+    @Override
+    public Intent getIntent(IntentId id) {
+        return null;
+    }
+
+    @Override
+    public IntentState getIntentState(IntentId id) {
+        return null;
+    }
+
+    @Override
+    public List<Intent> getInstallableIntents(IntentId intentId) {
+        return null;
+    }
+
+    @Override
+    public void addListener(IntentListener listener) {
+
+    }
+
+    @Override
+    public void removeListener(IntentListener listener) {
+
+    }
+}
diff --git a/core/api/src/test/java/org/onosproject/net/statistic/StatisticServiceAdapter.java b/core/api/src/test/java/org/onosproject/net/statistic/StatisticServiceAdapter.java
new file mode 100644
index 0000000..cf8f36f
--- /dev/null
+++ b/core/api/src/test/java/org/onosproject/net/statistic/StatisticServiceAdapter.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2015 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.net.statistic;
+
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.GroupId;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.Link;
+import org.onosproject.net.Path;
+import org.onosproject.net.flow.FlowRule;
+
+import java.util.Optional;
+
+/**
+ * Test adapter for statistics service.
+ */
+public class StatisticServiceAdapter implements StatisticService {
+    @Override
+    public Load load(Link link) {
+        return null;
+    }
+
+    @Override
+    public Load load(ConnectPoint connectPoint) {
+        return null;
+    }
+
+    @Override
+    public Link max(Path path) {
+        return null;
+    }
+
+    @Override
+    public Link min(Path path) {
+        return null;
+    }
+
+    @Override
+    public FlowRule highestHitter(ConnectPoint connectPoint) {
+        return null;
+    }
+
+    @Override
+    public Load load(Link link, ApplicationId appId, Optional<GroupId> groupId) {
+        return null;
+    }
+}
diff --git a/web/gui/pom.xml b/web/gui/pom.xml
index 48f0966..d3b289f 100644
--- a/web/gui/pom.xml
+++ b/web/gui/pom.xml
@@ -46,5 +46,11 @@
             <artifactId>servlet-api</artifactId>
             <version>2.5</version>
         </dependency>
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-api</artifactId>
+            <scope>test</scope>
+            <classifier>tests</classifier>
+        </dependency>
     </dependencies>
 </project>
diff --git a/web/gui/src/main/java/org/onosproject/gui/TopologyViewWebSocket.java b/web/gui/src/main/java/org/onosproject/gui/TopologyViewWebSocket.java
index 42d656b..c3ffc1d 100644
--- a/web/gui/src/main/java/org/onosproject/gui/TopologyViewWebSocket.java
+++ b/web/gui/src/main/java/org/onosproject/gui/TopologyViewWebSocket.java
@@ -267,7 +267,7 @@
     }
 
     // Sends the specified data to the client.
-    private synchronized void sendMessage(ObjectNode data) {
+    protected synchronized void sendMessage(ObjectNode data) {
         try {
             if (connection.isOpen()) {
                 connection.sendMessage(data.toString());
diff --git a/web/gui/src/test/java/org/onosproject/gui/TopologyViewWebSocketTest.java b/web/gui/src/test/java/org/onosproject/gui/TopologyViewWebSocketTest.java
new file mode 100644
index 0000000..cdf85dc
--- /dev/null
+++ b/web/gui/src/test/java/org/onosproject/gui/TopologyViewWebSocketTest.java
@@ -0,0 +1,171 @@
+/*
+ * Copyright 2015 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.gui;
+
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.ImmutableSet;
+import org.junit.Before;
+import org.junit.Test;
+import org.onlab.osgi.ServiceDirectory;
+import org.onlab.osgi.TestServiceDirectory;
+import org.onlab.packet.ChassisId;
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.VlanId;
+import org.onosproject.cluster.ClusterService;
+import org.onosproject.cluster.ClusterServiceAdapter;
+import org.onosproject.core.CoreService;
+import org.onosproject.core.CoreServiceAdapter;
+import org.onosproject.core.Version;
+import org.onosproject.mastership.MastershipService;
+import org.onosproject.mastership.MastershipServiceAdapter;
+import org.onosproject.net.DefaultDevice;
+import org.onosproject.net.DefaultHost;
+import org.onosproject.net.Device;
+import org.onosproject.net.DeviceId;
+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.DeviceService;
+import org.onosproject.net.device.DeviceServiceAdapter;
+import org.onosproject.net.flow.FlowEntry;
+import org.onosproject.net.flow.FlowRuleService;
+import org.onosproject.net.flow.FlowRuleServiceAdapter;
+import org.onosproject.net.host.HostService;
+import org.onosproject.net.host.HostServiceAdapter;
+import org.onosproject.net.intent.IntentService;
+import org.onosproject.net.intent.IntentServiceAdapter;
+import org.onosproject.net.link.LinkService;
+import org.onosproject.net.link.LinkServiceAdapter;
+import org.onosproject.net.provider.ProviderId;
+import org.onosproject.net.statistic.StatisticService;
+import org.onosproject.net.statistic.StatisticServiceAdapter;
+import org.onosproject.net.topology.TopologyService;
+import org.onosproject.net.topology.TopologyServiceAdapter;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+
+import static org.junit.Assert.assertEquals;
+
+public class TopologyViewWebSocketTest {
+
+    private static final ProviderId PID = new ProviderId("of", "foo.bar");
+    private static final ChassisId CHID = new ChassisId(123L);
+    private static final MacAddress MAC = MacAddress.valueOf("00:00:00:00:00:19");
+    private static final DeviceId DID = DeviceId.deviceId("of:foo");
+    private static final Set<IpAddress> IPS = ImmutableSet.of(IpAddress.valueOf("1.2.3.4"));
+
+    private TestWebSocket ws;
+    private TestServiceDirectory sd;
+
+    @Before
+    public void setUp() {
+        sd = new TestServiceDirectory();
+        sd.add(DeviceService.class, new TestDeviceService());
+        sd.add(ClusterService.class, new ClusterServiceAdapter());
+        sd.add(LinkService.class, new LinkServiceAdapter());
+        sd.add(HostService.class, new TestHostService());
+        sd.add(MastershipService.class, new MastershipServiceAdapter());
+        sd.add(IntentService.class, new IntentServiceAdapter());
+        sd.add(FlowRuleService.class, new TestFlowService());
+        sd.add(StatisticService.class, new StatisticServiceAdapter());
+        sd.add(TopologyService.class, new TopologyServiceAdapter());
+        sd.add(CoreService.class, new TestCoreService());
+        ws = new TestWebSocket(sd);
+    }
+
+    @Test
+    public void requestDetailsDevice() {
+        // build the request
+        String request = "{\"event\":\"requestDetails\", \"sid\":0, "
+                + "\"payload\":{\"id\":\"of:000001\",\"class\":\"device\"}}";
+        ws.onMessage(request);
+        // look at the ws reply, and verify that it is correct
+        assertEquals("incorrect id", "of:000001", ws.reply.path("payload").path("id").asText());
+        assertEquals("incorrect mfr", "foo", ws.reply.path("payload").path("props").path("Vendor").asText());
+    }
+
+    @Test
+    public void requestDetailsHost() {
+        // build the request
+        String request = "{\"event\":\"requestDetails\", \"sid\":0, "
+                + "\"payload\":{\"id\":\"00:00:00:00:00:19/-1\",\"class\":\"host\"}}";
+        ws.onMessage(request);
+        // look at the ws reply, and verify that it is correct
+        assertEquals("incorrect id", "00:00:00:00:00:19/-1", ws.reply.path("payload").path("id").asText());
+        assertEquals("incorrect ip address", "1.2.3.4", ws.reply.path("payload").path("props").path("IP").asText());
+    }
+
+    private class TestWebSocket extends TopologyViewWebSocket {
+
+        private ObjectNode reply;
+
+        /**
+         * Creates a new web-socket for serving data to GUI topology view.
+         *
+         * @param directory service directory
+         */
+        public TestWebSocket(ServiceDirectory directory) {
+            super(directory);
+        }
+
+        @Override
+        protected synchronized void sendMessage(ObjectNode data) {
+            reply = data;
+        }
+    }
+
+    private class TestCoreService extends CoreServiceAdapter {
+        @Override
+        public Version version() {
+            return Version.version("1.2.3");
+        }
+    }
+
+    private class TestDeviceService extends DeviceServiceAdapter {
+
+        @Override
+        public Device getDevice(DeviceId deviceId) {
+            return new DefaultDevice(PID, deviceId, Device.Type.SWITCH,
+                                     "foo", "hw", "sw", "sn", CHID);
+        }
+
+        @Override
+        public List<Port> getPorts(DeviceId deviceId) {
+            return new ArrayList<>();
+        }
+    }
+
+    private class TestFlowService extends FlowRuleServiceAdapter {
+        @Override
+        public Iterable<FlowEntry> getFlowEntries(DeviceId deviceId) {
+            return new ArrayList<>();
+        }
+    }
+
+    private class TestHostService extends HostServiceAdapter {
+        @Override
+        public Host getHost(HostId hostId) {
+            return new DefaultHost(PID, hostId, MAC, VlanId.NONE,
+                                   new HostLocation(DID, PortNumber.P0, 123L), IPS);
+        }
+    }
+}
\ No newline at end of file