Index: tests/disposition.test
===================================================================
diff -u -rce55b9f6e80b8444dd248b1e6e36217716331ee9 -r24724ebae83af4e0104b349a2fb582bfc71a7475
--- tests/disposition.test	(.../disposition.test)	(revision ce55b9f6e80b8444dd248b1e6e36217716331ee9)
+++ tests/disposition.test	(.../disposition.test)	(revision 24724ebae83af4e0104b349a2fb582bfc71a7475)
@@ -193,9 +193,10 @@
 
   C setObjectParams {{-single-np:alias}}
   ? {[C new -single-np [list -x]] eval {set :single-np}} \
-      "Argument for parameter '-x' expected"
+      "Value for parameter '-x' expected"
   ? {[C new -single-np [list -x X]] eval {set :single-np}} \
-      "Invalid argument '-x X', maybe too many arguments; should be \"[C inst] single-np -x\""
+      "Invalid non-positional argument '-x X', valid are : -x;
+ should be \"::__%&singleton single-np -x\""
 
   #
   # INTERACTIONS with other parameter types