class method self.new

# File actionpack/lib/action_controller/test_process.rb, line 373
    def initialize(path, content_type = Mime::TEXT, binary = false)
      raise "#{path} 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)
      @tempfile.set_encoding(Encoding::BINARY) if @tempfile.respond_to?(:set_encoding)
      @tempfile.binmode if binary
      FileUtils.copy_file(path, @tempfile.path)
    end