YANG uses and UT

Change-Id: Id3ec5cfed2b8e2a7d2d580786c70b5804f03ecfa
diff --git a/src/test/resources/SelfResolutionNestedGroupingWithUnresolvedUses.yang b/src/test/resources/SelfResolutionNestedGroupingWithUnresolvedUses.yang
new file mode 100644
index 0000000..4dbc1a2
--- /dev/null
+++ b/src/test/resources/SelfResolutionNestedGroupingWithUnresolvedUses.yang
@@ -0,0 +1,17 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container test{
+        leaf leaf2{
+            type String;
+        }
+    	grouping treat {
+            grouping create {
+                grouping mass {
+                }
+            }
+        }
+    }
+    uses treat;
+}