# File lib/specinfra/command/darwin/base/package.rb, line 15
    def check_is_installed_by_homebrew_cask(package, version=nil)
      escaped_package = escape(File.basename(package))
      if version
        cmd = "brew cask info #{escaped_package} | grep -E '^/opt/homebrew-cask/Caskroom/#{escaped_package}/#{escape(version)}'"
      else
        cmd = "#{brew_cask_list} | grep -E '^#{escaped_package}$'"
      end
      cmd
    end