# File lib/test/unit/assertions.rb, line 266
      def assert_kind_of(klass, object, message="")
        _wrap_assertion do
          klasses = nil
          klasses = klass if klass.is_a?(Array)
          assert_block("The first parameter to assert_kind_of should be " +
                       "a kind_of Module or an Array of a kind_of Module.") do
            if klasses
              klasses.all? {|k| k.kind_of?(Module)}
            else
              klass.kind_of?(Module)
            end
          end
          klass_message = AssertionMessage.maybe_container(klass) do |value|
            "<#{value}>"
          end
          full_message = build_message(message,
                                       "<?> expected to be kind_of\\?\n" +
                                       "? but was\n" +
                                       "<?>.",
                                       object,
                                       klass_message,
                                       object.class)
          assert_block(full_message) do
            if klasses
              klasses.any? {|k| object.kind_of?(k)}
            else
              object.kind_of?(klass)
            end
          end
        end
      end