# File lib/test/unit/assertions.rb, line 1198
      def assert_alias_method(object, alias_name, original_name, message=nil)
        _wrap_assertion do
          find_method_failure_message = Proc.new do |method_name|
            build_message(message,
                          "<?>.? doesn't exist\n" +
                          "(Class: <?>)",
                          object,
                          AssertionMessage.literal(method_name),
                          object.class)
          end

          alias_method = original_method = nil
          assert_block(find_method_failure_message.call(alias_name)) do
            begin
              alias_method = object.method(alias_name)
              true
            rescue NameError
              false
            end
          end
          assert_block(find_method_failure_message.call(original_name)) do
            begin
              original_method = object.method(original_name)
              true
            rescue NameError
              false
            end
          end

          full_message = build_message(message,
                                       "<?> is alias of\n" +
                                       "<?> expected",
                                       alias_method,
                                       original_method)
          assert_block(full_message) do
            alias_method == original_method
          end
        end
      end