YANG construct collision detection framework added

Change-Id: I1458f9e3192641f3f90c444798c31a64536ffa5d
diff --git a/src/test/resources/ListWithDuplicateLeaf.yang b/src/test/resources/ListWithDuplicateLeaf.yang
new file mode 100644
index 0000000..55a78f6
--- /dev/null
+++ b/src/test/resources/ListWithDuplicateLeaf.yang
@@ -0,0 +1,26 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            config true;
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            config true;
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}