YANG uses and UT

Change-Id: Id3ec5cfed2b8e2a7d2d580786c70b5804f03ecfa
diff --git a/src/test/resources/SelfResolutionGroupingReferencingItselfFailureScenerio.yang b/src/test/resources/SelfResolutionGroupingReferencingItselfFailureScenerio.yang
new file mode 100644
index 0000000..3e0ba3d
--- /dev/null
+++ b/src/test/resources/SelfResolutionGroupingReferencingItselfFailureScenerio.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+    	grouping endpoint {
+             leaf zip-code {
+                 type string;
+             }
+             uses endpoint;
+    	}
+    }
+}