code: def run(self, directories=None):
          
          if directories is None:
              directories = [os.getcwd()]
  
          total_successes, total_errors, total_skipped = 0, 0, 0
          for directory in directories:
              successes, errors, skips = self.execute(self.find_specs(directory))
              total_successes += successes
              total_errors += errors
              total_skipped += skips
  
  
          self.formatter.finalize()
          return total_successes, total_errors, total_skipped
docs: Finds and runs the specs. Returns a tuple indicating the
          number of (succeses, failures, skipped)>