code: def add_expect_string_healthcheck(self, expect_string):
          
  
          healthcheck_map = dict()
          healthcheck_map['expect_string'] = expect_string
  
          url = 'healthcheckexpect/add/expect_string/'
  
          code, xml = self.submit({'healthcheck': healthcheck_map}, 'POST', url)
  
          return self.response(code, xml)
docs: Inserts a new healthckeck_expect  with only expect_string.
  
          :param expect_string: expect_string.
  
          :return: Dictionary with the following structure:
  
          ::
  
              {'healthcheck_expect': {'id': < id >}}
  
          :raise InvalidParameterError: The value of expect_string is invalid.
          :raise HealthCheckExpectJaCadastradoError: There is already a healthcheck_expect registered with the same data.
          :raise HealthCheckExpectNaoExisteError: Healthcheck_expect not registered.
          :raise DataBaseError: Networkapi failed to access the database.
          :raise XMLError: Networkapi failed to generate the XML response.