    # File lib/action_controller/test_process.rb, line 311
        def initialize(path, content_type = 'text/plain')
          raise "file does not exist" unless File.exist?(path)
          @content_type = content_type
          @original_filename = path.sub(/^.*#{File::SEPARATOR}([^#{File::SEPARATOR}]+)$/) { $1 }
          @tempfile = Tempfile.new(@original_filename)
          FileUtils.copy_file(path, @tempfile.path)
        end