public void CustomAsync_within_ruleset()
{
var validator = new InlineValidator <Person>();
validator.RuleSet("foo", () => validator.CustomAsync(async x => new ValidationFailure("x", "y")));
validator.RuleSet("bar", () => validator.CustomAsync(async x => new ValidationFailure("x", "y")));
var result = validator.ValidateAsync(new Person(), ruleSet: "foo").Result;
result.Errors.Count.ShouldEqual(1);
}