# File lib/test/unit/util/output.rb, line 14
        def capture_output
          require 'stringio'

          output = StringIO.new
          error = StringIO.new
          stdout_save, stderr_save = $stdout, $stderr
          $stdout, $stderr = output, error
          begin
            yield
            [output.string, error.string]
          ensure
            $stdout, $stderr = stdout_save, stderr_save
          end
        end