public void SimpleProperty()
        {
            const string Value   = "hello!";
            var          count   = 0;
            var          builder = new ValidatorBuilder <object>();

            builder
            .ForType <Test1>()
            .AddProperty(t => t.Instance);

            var test = new Test1
            {
                Instance = new Test2
                {
                    Member = Value,
                },
            };

            builder.AddConstraint(_ => new DelegateConstraint(value =>
            {
                if (value is string)
                {
                    Assert.Equal(Value, value);
                    count++;
                }

                return(true);
            }));

            var validator = builder.Build();
            var context   = new TestValidationContext();

            validator.Validate(test, context.Context);

            Assert.Equal(1, count);
        }