public async void GetCustomersByMail_ActionExecutes_ReturnResultWithCustomerDto(string mail)
        {
            _mockService.Setup(x => x.GetUserByMailAsync(mail)).ReturnsAsync(Response <CustomerDto> .Success(customers.Find(x => x.Email == mail), 200));
            var result = await _controller.GetByMail(mail);

            Assert.IsType <ObjectResult>(result);
        }