How to use dir_separator method of SeleniumRake Package

...51      @of_parts ||=52        if of =~ %r{build([/\\])}53          of.split(Regexp.last_match(1))[1..-1]54        else55          of.split(Platform.dir_separator)56        end57    end58    def crash_if_no_mapping_key(type)59      raise "No mapping for type #{type.name}" unless @mappings.key?(type.name)60    end61  end62end...

...9      end10      def mac?11        (RbConfig::CONFIG['host_os'] =~ /darwin|mac os/) != nil12      end13      def dir_separator14        File::ALT_SEPARATOR || File::SEPARATOR15      end16      def path_for(path)17        windows? ? path.gsub('/', dir_separator) : path18      end19      def classpath_separator?20        if cygwin?21          ';'22        else23          File::PATH_SEPARATOR24        end25      end26      def chrome?27        present?('chromedriver') || present?('chromedriver.exe')28      end29      def edge?30        present?('msedgedriver') || present?('msedgedriver.exe')31      end...