public void When_Age_is_under_sixteen_the_object_is_invalid()
{
var sut = new Citizen();
sut.Age = 12;
sut.BirtDate = DateTime.Parse("2015/10/12");
sut.Name = "AValidName";
var validationResults = new List<ValidationResult>();
var context = new ValidationContext(sut);
Assert.False(Validator.TryValidateObject(sut, context, validationResults));
Assert.Equal(validationResults.Count, 1);
}
bool ValidateObject(Citizen obj, ICollection<ValidationResult> validationResults)
{
var context = new ValidationContext(obj, serviceProvider: null, items: null);
return Validator.TryValidateObject(obj, context, validationResults);
}