private async void BeUniqueByName_Create_Not_Exists()
        {
            Mock <ILocationRepository> locationRepository = new Mock <ILocationRepository>();

            locationRepository.Setup(x => x.ByName(It.IsAny <string>())).Returns(Task.FromResult <Location>(null));
            var validator = new ApiLocationRequestModelValidator(locationRepository.Object);

            await validator.ValidateCreateAsync(new ApiLocationRequestModel());

            validator.ShouldNotHaveValidationErrorFor(x => x.Name, "A");
        }