public void Runs_otherwise_conditons_for_Unless()
        {
            var validator = new TestValidator();

            validator.Unless(x => x.Age > 10, () => {
                validator.RuleFor(x => x.Forename).NotNull();
            }).Otherwise(() => {
                validator.RuleFor(x => x.Surname).NotNull();
            });

            var result1 = validator.Validate(new Person {
                Age = 11
            });

            result1.Errors.Single().PropertyName.ShouldEqual("Surname");
            var result2 = validator.Validate(new Person {
                Age = 9
            });

            result2.Errors.Single().PropertyName.ShouldEqual("Forename");
        }