YANG construct collision detection framework added

Change-Id: I1458f9e3192641f3f90c444798c31a64536ffa5d
diff --git a/utils/yangutils/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LeafListListenerTest.java b/utils/yangutils/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LeafListListenerTest.java
index 359b108..afa48da 100644
--- a/utils/yangutils/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LeafListListenerTest.java
+++ b/utils/yangutils/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LeafListListenerTest.java
@@ -120,7 +120,7 @@
     @Test
     public void processLeafListConfigInvalidCardinality() throws IOException, ParserException {
         thrown.expect(ParserException.class);
-        thrown.expectMessage("Internal parser error detected: Invalid cardinality in config before processing.");
+        thrown.expectMessage("YANG file error: Invalid cardinality of config in leaf-list \"invalid-interval\".");
         YangNode node = manager.getDataModel("src/test/resources/LeafListConfigInvalidCardinality.yang");
     }
 
@@ -131,7 +131,7 @@
     @Test
     public void processLeafListUnitsInvalidCardinality() throws IOException, ParserException {
         thrown.expect(ParserException.class);
-        thrown.expectMessage("Internal parser error detected: Invalid cardinality in units before processing.");
+        thrown.expectMessage("YANG file error: Invalid cardinality of units in leaf-list \"invalid-interval\".");
         YangNode node = manager.getDataModel("src/test/resources/LeafListUnitsInvalidCardinality.yang");
     }