YANG Grouping Linker Support

Change-Id: I2fec0c0bb4d1584e82ffba3228106897ccad2bf5
diff --git a/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LengthRestrictionListenerTest.java b/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LengthRestrictionListenerTest.java
index e5e647a..a8f494b 100644
--- a/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LengthRestrictionListenerTest.java
+++ b/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LengthRestrictionListenerTest.java
@@ -128,7 +128,7 @@
         assertThat(yangNode.getName(), is("Test"));
 
         YangTypeDef typedef = (YangTypeDef) yangNode.getChild();
-        YangStringRestriction stringRestriction = (YangStringRestriction) typedef.getDataType()
+        YangStringRestriction stringRestriction = (YangStringRestriction) typedef.getTypeDefBaseType()
                 .getDataTypeExtendedInfo();
 
         YangRangeRestriction lengthRestriction = stringRestriction.getLengthRestriction();
@@ -234,4 +234,4 @@
                 " 18446744073709551615.");
         YangNode node = manager.getDataModel("src/test/resources/LengthWithInvalidInterval.yang");
     }
-}
\ No newline at end of file
+}