# File lib/test/unit/assertions.rb, line 1118
      def assert_const_defined(object, constant_name, message=nil)
        _wrap_assertion do
          full_message = build_message(message,
                                       "<?>.const_defined\\?(<?>) expected.",
                                       object, constant_name)
          assert_block(full_message) do
            object.const_defined?(constant_name)
          end
        end
      end