text: Title: Add unit tests for the `__repr__` method of the SpecEvaluator class
  Body: ## Unit Test
  
  ### Description
  
  Add unit tests for the `__repr__` method of the **SpecEvaluator** class: https://github.com/scanapi/scanapi/blob/main/scanapi/evaluators/spec_evaluator.py#L42
  
  [ScanAPI Writing Tests Documentation](https://github.com/scanapi/scanapi/wiki/Writing-Tests)