new (Rack::Test::UploadedFile)

    # File lib/rack/test/uploaded_file.rb, line 13
          def initialize(path, content_type = "text/plain", binary = false)
            raise "#{path} file does not exist" unless ::File.exist?(path)
            @content_type = content_type
            @original_filename = ::File.basename(path)
            @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