Unit tests for open flow message encode and decode

Change-Id: Id0d6975b760943d3fc2ad97d176fc538eab2c5bf
diff --git a/openflow/pom.xml b/openflow/pom.xml
index 437f743..91fe2f6 100644
--- a/openflow/pom.xml
+++ b/openflow/pom.xml
@@ -45,6 +45,24 @@
             <groupId>org.onosproject</groupId>
             <artifactId>onlab-junit</artifactId>
         </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.11</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-core</artifactId>
+            <version>1.3</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-library</artifactId>
+            <version>1.3</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>