public async void CityId_Update_Valid_Reference()
        {
            Mock <IEventRepository> eventRepository = new Mock <IEventRepository>();

            eventRepository.Setup(x => x.CityByCityId(It.IsAny <int>())).Returns(Task.FromResult <City>(new City()));

            var validator = new ApiEventServerRequestModelValidator(eventRepository.Object);
            await validator.ValidateUpdateAsync(default(int), new ApiEventServerRequestModel());

            validator.ShouldNotHaveValidationErrorFor(x => x.CityId, 1);
        }
        public async void EventStatusId_Create_Valid_Reference()
        {
            Mock <IEventRepository> eventRepository = new Mock <IEventRepository>();

            eventRepository.Setup(x => x.EventStatusByEventStatusId(It.IsAny <int>())).Returns(Task.FromResult <EventStatus>(new EventStatus()));

            var validator = new ApiEventServerRequestModelValidator(eventRepository.Object);
            await validator.ValidateCreateAsync(new ApiEventServerRequestModel());

            validator.ShouldNotHaveValidationErrorFor(x => x.EventStatusId, 1);
        }