input: from typing import Tuple
  
  
  def test_calculator(Calculator_class) -> Tuple[str, int]:
      """
      Test the calculator class by instantiating it and calling the add_two_numbers method.
      Returns a tuple with a string indicating whether the test passed or failed, and the result of the method call.
      
      >>> test_calculator(Calculator)
      ('Pass', 3)
      """
      test_instance = Calculator_class()
      result = test_instance.add_two_numbers(1, 2)
      if result == 3:
          return ('Pass', result)
      else:
          return ('Fail', result)
output:     test_instance = Calculator_class()
      result = test_instance.add_two_numbers(1, 2)
      if result == 3:
          return ('Pass', result)
      else:
          return ('Fail', result)