public void AddStepResult(Step step)
 {
     if (!StepResults.Any(sr => sr.Step.SelectorId == step.SelectorId && sr.Step.Value == step.Value))
     {
         StepResults.Add(new StepResult(step));
     }
     else
     {
         var stepResult = StepResults.First(sr => sr.Step.SelectorId == step.SelectorId && sr.Step.Value == step.Value);
         stepResult.Attempts++;
     }
 }