[ONOS-5178] Defect fix :No get/set for root node in generated service

Change-Id: I9d90068e4cdd3d35a9ee71fd1f00c4a635b191b7
diff --git a/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/SubModuleListenerTest.java b/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/SubModuleListenerTest.java
index 6a53cbe..3210948 100644
--- a/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/SubModuleListenerTest.java
+++ b/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/SubModuleListenerTest.java
@@ -26,7 +26,6 @@
 import java.io.IOException;
 
 import static org.hamcrest.core.Is.is;
-import static org.hamcrest.core.IsNull.notNullValue;
 import static org.junit.Assert.assertThat;
 
 /**
@@ -109,7 +108,7 @@
         // Checks for the version value in data model tree.
         assertThat(yangNode.getBelongsTo().getPrefix(), is("On1"));
         //Checks the revision with current date is created for empty revision statement.
-        assertThat(((YangSubModule) node).getRevision().getRevDate(), notNullValue());
+        assertThat(true, is(node.getRevision() == null));
     }
 
     /**