# File lib/autotest/rspec2.rb, line 48
  def make_test_cmd(files_to_test)
    warn_about_bundler if rspec_wants_bundler? && !autotest_wants_bundler?
    files_to_test.empty? ? '' :
      "#{prefix}#{ruby}#{suffix} -S #{SPEC_PROGRAM} #{cl_args.join(' ')} #{normalize(files_to_test).keys.flatten.map { |f| "'#{f}'"}.join(' ')}"
  end