extensions CHANGE metadata substatements

Support processing of all the Metadata annotation's substatements. Also
add basic test for overall annotation implementation
diff --git a/tests/features/CMakeLists.txt b/tests/features/CMakeLists.txt
index 20c5d94..6e4a366 100644
--- a/tests/features/CMakeLists.txt
+++ b/tests/features/CMakeLists.txt
@@ -1,8 +1,10 @@
 set(local_tests
     features_types
+    features_metadata
     features_nacm)
 set(local_tests_wraps
     " "
+    " "
     " ")
 set(tests ${tests} ${local_tests} PARENT_SCOPE)
 set(tests_wraps ${tests_wraps} ${local_tests_wraps} PARENT_SCOPE)