file_fixture

# File activesupport/lib/active_support/testing/file_fixtures.rb, line 26
      def file_fixture(fixture_name)
        path = Pathname.new(File.join(file_fixture_path, fixture_name))

        if path.exist?
          path
        else
          msg = "the directory '%s' does not contain a file named '%s'"
          raise ArgumentError, msg % [file_fixture_path, fixture_name]
        end
      end