code: public OverviewStats valuate(CucumberFeatureResult[] results) {
          this.reset();
          for (CucumberFeatureResult result : results) {
              result.valuate();
              this.addOverallDuration(result.getDuration());
              OverviewStats stats = new OverviewStats();
              stats.valuate(result);
              this.add(stats);
          }
          return this;
      }
docs: Calculates overall statistics for the group of features.
  @param results the list of features to calculate run statistics for.
  @return calculated statistics for the specified set of features.