diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/web/OpenstackNetworkingCodecRegister.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/web/OpenstackNetworkingCodecRegister.java
index 55077f3..92167d0 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/web/OpenstackNetworkingCodecRegister.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/web/OpenstackNetworkingCodecRegister.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-present Open Networking Foundation
+ * Copyright 2018-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.
diff --git a/apps/openstacknetworking/app/src/test/java/org/onosproject/openstacknetworking/web/OpenstackNetworkingCodecRegisterTest.java b/apps/openstacknetworking/app/src/test/java/org/onosproject/openstacknetworking/web/OpenstackNetworkingCodecRegisterTest.java
new file mode 100644
index 0000000..51f0b24
--- /dev/null
+++ b/apps/openstacknetworking/app/src/test/java/org/onosproject/openstacknetworking/web/OpenstackNetworkingCodecRegisterTest.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright 2018-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.onosproject.openstacknetworking.web;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Maps;
+import org.junit.Test;
+import org.onlab.junit.TestUtils;
+import org.onosproject.codec.CodecService;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.openstacknetworking.api.InstancePort;
+import org.onosproject.openstacknetworking.codec.InstancePortCodec;
+
+import java.util.Map;
+import java.util.Set;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+/**
+ * Unit test for openstack networking codec register.
+ */
+public final class OpenstackNetworkingCodecRegisterTest {
+
+    private OpenstackNetworkingCodecRegister register;
+
+    /**
+     * Tests codec register activation and deactivation.
+     */
+    @Test
+    public void testActivateDeactivate() {
+        register = new OpenstackNetworkingCodecRegister();
+        CodecService codecService = new TestCodecService();
+
+        TestUtils.setField(register, "codecService", codecService);
+        register.activate();
+
+        assertEquals(InstancePortCodec.class.getName(),
+                codecService.getCodec(InstancePort.class).getClass().getName());
+
+        register.deactivate();
+
+        assertNull(codecService.getCodec(InstancePort.class));
+    }
+
+    private static class TestCodecService implements CodecService {
+
+        private Map<String, JsonCodec> codecMap = Maps.newConcurrentMap();
+
+        @Override
+        public Set<Class<?>> getCodecs() {
+            return ImmutableSet.of();
+        }
+
+        @Override
+        public <T> JsonCodec<T> getCodec(Class<T> entityClass) {
+            return codecMap.get(entityClass.getName());
+        }
+
+        @Override
+        public <T> void registerCodec(Class<T> entityClass, JsonCodec<T> codec) {
+            codecMap.put(entityClass.getName(), codec);
+        }
+
+        @Override
+        public void unregisterCodec(Class<?> entityClass) {
+            codecMap.remove(entityClass.getName());
+        }
+    }
+}
diff --git a/apps/openstacknode/app/src/test/java/org/onosproject/openstacknode/web/OpenstackNodeCodecRegisterTest.java b/apps/openstacknode/app/src/test/java/org/onosproject/openstacknode/web/OpenstackNodeCodecRegisterTest.java
new file mode 100644
index 0000000..e1cfa9b
--- /dev/null
+++ b/apps/openstacknode/app/src/test/java/org/onosproject/openstacknode/web/OpenstackNodeCodecRegisterTest.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2018-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.onosproject.openstacknode.web;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Maps;
+import org.junit.Test;
+import org.onlab.junit.TestUtils;
+import org.onosproject.codec.CodecService;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.net.behaviour.ControllerInfo;
+import org.onosproject.openstacknode.api.OpenstackAuth;
+import org.onosproject.openstacknode.api.OpenstackNode;
+import org.onosproject.openstacknode.api.OpenstackPhyInterface;
+import org.onosproject.openstacknode.api.OpenstackSshAuth;
+import org.onosproject.openstacknode.codec.OpenstackAuthCodec;
+import org.onosproject.openstacknode.codec.OpenstackControllerCodec;
+import org.onosproject.openstacknode.codec.OpenstackNodeCodec;
+import org.onosproject.openstacknode.codec.OpenstackPhyInterfaceCodec;
+import org.onosproject.openstacknode.codec.OpenstackSshAuthCodec;
+
+import java.util.Map;
+import java.util.Set;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+/**
+ * Unit test for openstack node codec register.
+ */
+public final class OpenstackNodeCodecRegisterTest {
+
+    private OpenstackNodeCodecRegister register;
+
+    /**
+     * Tests codec register activation and deactivation.
+     */
+    @Test
+    public void testActivateDeactivate() {
+        register = new OpenstackNodeCodecRegister();
+        CodecService codecService = new TestCodecService();
+
+        TestUtils.setField(register, "codecService", codecService);
+        register.activate();
+
+        assertEquals(OpenstackNodeCodec.class.getName(),
+                codecService.getCodec(OpenstackNode.class).getClass().getName());
+        assertEquals(OpenstackAuthCodec.class.getName(),
+                codecService.getCodec(OpenstackAuth.class).getClass().getName());
+        assertEquals(OpenstackPhyInterfaceCodec.class.getName(),
+                codecService.getCodec(OpenstackPhyInterface.class).getClass().getName());
+        assertEquals(OpenstackControllerCodec.class.getName(),
+                codecService.getCodec(ControllerInfo.class).getClass().getName());
+        assertEquals(OpenstackSshAuthCodec.class.getName(),
+                codecService.getCodec(OpenstackSshAuth.class).getClass().getName());
+
+        register.deactivate();
+
+        assertNull(codecService.getCodec(OpenstackNode.class));
+        assertNull(codecService.getCodec(OpenstackAuth.class));
+        assertNull(codecService.getCodec(OpenstackPhyInterface.class));
+        assertNull(codecService.getCodec(ControllerInfo.class));
+        assertNull(codecService.getCodec(OpenstackSshAuth.class));
+    }
+
+    private static class TestCodecService implements CodecService {
+
+        private Map<String, JsonCodec> codecMap = Maps.newConcurrentMap();
+
+        @Override
+        public Set<Class<?>> getCodecs() {
+            return ImmutableSet.of();
+        }
+
+        @Override
+        public <T> JsonCodec<T> getCodec(Class<T> entityClass) {
+            return codecMap.get(entityClass.getName());
+        }
+
+        @Override
+        public <T> void registerCodec(Class<T> entityClass, JsonCodec<T> codec) {
+            codecMap.put(entityClass.getName(), codec);
+        }
+
+        @Override
+        public void unregisterCodec(Class<?> entityClass) {
+            codecMap.remove(entityClass.getName());
+        }
+    }
+}
diff --git a/apps/openstacktelemetry/app/src/test/java/org/onosproject/openstacktelemetry/web/OpenstackTelemetryCodecRegisterTest.java b/apps/openstacktelemetry/app/src/test/java/org/onosproject/openstacktelemetry/web/OpenstackTelemetryCodecRegisterTest.java
new file mode 100644
index 0000000..683e9c1
--- /dev/null
+++ b/apps/openstacktelemetry/app/src/test/java/org/onosproject/openstacktelemetry/web/OpenstackTelemetryCodecRegisterTest.java
@@ -0,0 +1,93 @@
+/*
+ * Copyright 2018-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.onosproject.openstacktelemetry.web;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Maps;
+import org.junit.Test;
+import org.onlab.junit.TestUtils;
+import org.onosproject.codec.CodecService;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.openstacktelemetry.api.FlowInfo;
+import org.onosproject.openstacktelemetry.api.StatsFlowRule;
+import org.onosproject.openstacktelemetry.api.StatsInfo;
+import org.onosproject.openstacktelemetry.codec.FlowInfoJsonCodec;
+import org.onosproject.openstacktelemetry.codec.StatsFlowRuleJsonCodec;
+import org.onosproject.openstacktelemetry.codec.StatsInfoJsonCodec;
+
+import java.util.Map;
+import java.util.Set;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+/**
+ * Unit test for openstack telemetry codec register.
+ */
+public final class OpenstackTelemetryCodecRegisterTest {
+
+    private OpenstackTelemetryCodecRegister register;
+
+    /**
+     * Tests codec register activation and deactivation.
+     */
+    @Test
+    public void testActivateDeactivate() {
+        register = new OpenstackTelemetryCodecRegister();
+        CodecService codecService = new TestCodecService();
+
+        TestUtils.setField(register, "codecService", codecService);
+        register.activate();
+
+        assertEquals(StatsInfoJsonCodec.class.getName(),
+                codecService.getCodec(StatsInfo.class).getClass().getName());
+        assertEquals(FlowInfoJsonCodec.class.getName(),
+                codecService.getCodec(FlowInfo.class).getClass().getName());
+        assertEquals(StatsFlowRuleJsonCodec.class.getName(),
+                codecService.getCodec(StatsFlowRule.class).getClass().getName());
+
+        register.deactivate();
+
+        assertNull(codecService.getCodec(StatsInfo.class));
+        assertNull(codecService.getCodec(FlowInfo.class));
+        assertNull(codecService.getCodec(StatsFlowRule.class));
+    }
+
+    private static class TestCodecService implements CodecService {
+
+        private Map<String, JsonCodec> codecMap = Maps.newConcurrentMap();
+
+        @Override
+        public Set<Class<?>> getCodecs() {
+            return ImmutableSet.of();
+        }
+
+        @Override
+        public <T> JsonCodec<T> getCodec(Class<T> entityClass) {
+            return codecMap.get(entityClass.getName());
+        }
+
+        @Override
+        public <T> void registerCodec(Class<T> entityClass, JsonCodec<T> codec) {
+            codecMap.put(entityClass.getName(), codec);
+        }
+
+        @Override
+        public void unregisterCodec(Class<?> entityClass) {
+            codecMap.remove(entityClass.getName());
+        }
+    }
+}