# File lib/rspec/core/formatters/helpers.rb, line 45
        def format_duration(duration)
          precision = case
                      when duration < 1;    SUB_SECOND_PRECISION
                      when duration < 120;  DEFAULT_PRECISION
                      when duration < 300;  1
                      else                  0
                      end

          if duration > 60
            minutes = (duration.to_i / 60).to_i
            seconds = duration - minutes * 60

            "#{pluralize(minutes, 'minute')} #{pluralize(format_seconds(seconds, precision), 'second')}"
          else
            pluralize(format_seconds(duration, precision), 'second')
          end
        end