anchor.diff:  
     List<String> tags;
   
  -   Scenario background;
  +  Scenario background;
   
     List<Step> steps = [];
     GherkinTable examples = new GherkinTable();
  
positive.code: 
    Feature(this.name);
  
    Future execute(Worker worker, ResultBuffer buffer, Map<RegExp,Function> stepDefs, runTags) {
  
      if (doesTagsMatch(tags, runTags)) {
  
  
negative.code:           scenarioFuture.then((output) {
              buffer.merge(output[0]);
  
              if (output[1]) {
                okScenariosCount++;
              } else {
                koScenariosCount++;
              }
            }).catchError((e, s) {
              _log.debug("ERROR $e \n $s");
            });
  
            results.add(scenarioFuture);
  