# File lib/autotest/rspec2.rb, line 48
  def make_test_cmd(files_to_test)
    files_to_test.empty? ? '' :
      %|#{prefix}"#{ruby}"#{suffix} -S "#{RSPEC_EXECUTABLE}" --tty #{normalize(files_to_test).keys.flatten.map { |f| %|"#{f}"|}.join(' ')}|
  end