Feature, classes, use relative reference

Change-Id: I1942580e78d3c9e83fdad4927532186441fe3298
diff --git a/test/model/extensions/classes/third.yml b/test/model/extensions/classes/third.yml
index 20a937c..a5157cf 100644
--- a/test/model/extensions/classes/third.yml
+++ b/test/model/extensions/classes/third.yml
@@ -1,6 +1,7 @@
 classes:
 - missing.class
 - second
+- .defaults
 
 parameters:
   _param: