better test for attr

still #25

test/parfait/helper.rb

@@ -5,7 +5,7 @@ module Parfait
     include AST::Sexp
 
     def rewrite(input)
-      ast = Parser::Ruby22.parse( input )
+      ast = Parser::CurrentRuby.parse( input )
       new_ast = process(ast)
       new_ast.to_s
     end