public async void EventId_Update_Valid_Reference()
        {
            Mock <IEventRelatedDocumentRepository> eventRelatedDocumentRepository = new Mock <IEventRelatedDocumentRepository>();

            eventRelatedDocumentRepository.Setup(x => x.GetEvent(It.IsAny <string>())).Returns(Task.FromResult <Event>(new Event()));

            var validator = new ApiEventRelatedDocumentRequestModelValidator(eventRelatedDocumentRepository.Object);
            await validator.ValidateUpdateAsync(default(int), new ApiEventRelatedDocumentRequestModel());

            validator.ShouldNotHaveValidationErrorFor(x => x.EventId, "A");
        }
        public async void EventId_Update_length()
        {
            Mock <IEventRelatedDocumentRepository> eventRelatedDocumentRepository = new Mock <IEventRelatedDocumentRepository>();

            eventRelatedDocumentRepository.Setup(x => x.Get(It.IsAny <int>())).Returns(Task.FromResult(new EventRelatedDocument()));

            var validator = new ApiEventRelatedDocumentRequestModelValidator(eventRelatedDocumentRepository.Object);
            await validator.ValidateUpdateAsync(default(int), new ApiEventRelatedDocumentRequestModel());

            validator.ShouldHaveValidationErrorFor(x => x.EventId, new string('A', 51));
        }