private async void BeUniqueByApiKeyHashed_Create_Exists()
        {
            Mock <IApiKeyRepository> apiKeyRepository = new Mock <IApiKeyRepository>();

            apiKeyRepository.Setup(x => x.ByApiKeyHashed(It.IsAny <string>())).Returns(Task.FromResult <ApiKey>(new ApiKey()));
            var validator = new ApiApiKeyRequestModelValidator(apiKeyRepository.Object);

            await validator.ValidateCreateAsync(new ApiApiKeyRequestModel());

            validator.ShouldHaveValidationErrorFor(x => x.ApiKeyHashed, "A");
        }
        public async void UserId_Update_length()
        {
            Mock <IApiKeyRepository> apiKeyRepository = new Mock <IApiKeyRepository>();

            apiKeyRepository.Setup(x => x.Get(It.IsAny <string>())).Returns(Task.FromResult(new ApiKey()));

            var validator = new ApiApiKeyRequestModelValidator(apiKeyRepository.Object);
            await validator.ValidateUpdateAsync(default(string), new ApiApiKeyRequestModel());

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