YANG uses and UT

Change-Id: Id3ec5cfed2b8e2a7d2d580786c70b5804f03ecfa
diff --git a/src/test/resources/SelfFileLinkingWithGroupingWithSelfAndExternalPrefixMix.yang b/src/test/resources/SelfFileLinkingWithGroupingWithSelfAndExternalPrefixMix.yang
new file mode 100644
index 0000000..84236a2
--- /dev/null
+++ b/src/test/resources/SelfFileLinkingWithGroupingWithSelfAndExternalPrefixMix.yang
@@ -0,0 +1,28 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import ietf-yang-types {
+        prefix "P";
+    }
+    grouping Percentage {
+        leaf hello{
+            type String;
+        }
+    }
+    container ospf {
+        list valid {
+            key "invalid";
+	    leaf invalid{
+                type String;
+            }
+            uses Ant:FirstClass;
+            grouping FirstClass {
+                uses P:PassingClass;
+            }
+        }
+        grouping PassingClass {
+            uses Ant:Percentage;
+        }
+    }
+}