public async void NextChainId_Create_Invalid_Reference()
        {
            Mock <IClaspRepository> claspRepository = new Mock <IClaspRepository>();

            claspRepository.Setup(x => x.GetChain(It.IsAny <int>())).Returns(Task.FromResult <Chain>(null));

            var validator = new ApiClaspRequestModelValidator(claspRepository.Object);

            await validator.ValidateCreateAsync(new ApiClaspRequestModel());

            validator.ShouldHaveValidationErrorFor(x => x.NextChainId, 1);
        }