Implemented unit tests for ServiceNetwork json codec

Change-Id: I150c831d51d2bb7eb08d945e56c99bece5dbfd72
diff --git a/pom.xml b/pom.xml
index 096db53..e67918a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -183,6 +183,13 @@
             <version>${onos.version}</version>
         </dependency>
 
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onlab-junit</artifactId>
+            <version>${onos.version}</version>
+            <scope>test</scope>
+        </dependency>
+
     </dependencies>
 
     <build>