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());
+        }
+    }
+}