# File lib/test/unit/assertions.rb, line 1304
      def assert_not_include(collection, object, message=nil)
        _wrap_assertion do
          assert_respond_to(collection, :include?,
                            "The collection must respond to :include?.")
          full_message = build_message(message,
                                       "<?> expected to not include\n<?>.",
                                       collection,
                                       object)
          assert_block(full_message) do
            not collection.include?(object)
          end
        end
      end