# File lib/test/unit/assertions.rb, line 536
      def assert_match(pattern, string, message="")
        _wrap_assertion do
          pattern = case(pattern)
            when String
              Regexp.new(Regexp.escape(pattern))
            else
              pattern
          end
          full_message = build_message(message,
                                       "<?> was expected to be =~\n<?>.",
                                       pattern, string)
          assert_block(full_message) { pattern =~ string }
        end
      end