def METHOD_NAME(self):
    Alien.total_aliens_created = 0
    aliens = [Alien(-2, 6)]
    error = ("Expected total_aliens_created to equal 1. Instead "
             f"it equals: {aliens[0].total_aliens_created}.")
    self.assertEqual(1, aliens[0].total_aliens_created, msg=error)
    aliens.append(Alien(3, 5))
    aliens.append(Alien(-5, -5))
    def error_text(alien, variable):
        return (
            "Expected all total_aliens_created variables to be "
            "equal to number of alien instances (i.e. 3).  Alien "
            f"number {alien}'s total_aliens_created variable "
            f"is equal to {variable}.")
    tac_list = [alien.total_aliens_created for alien in aliens]
    self.assertEqual(3, tac_list[0], msg=error_text(1, tac_list[0]))
    self.assertEqual(3, tac_list[1], msg=error_text(2, tac_list[1]))
    self.assertEqual(3, tac_list[2], msg=error_text(3, tac_list[2]))