SAMPLE: Sub properties using reflection

sample.cs

        // SAMPLE ONLY -- DON'T USE FOR REAL STUFF UNLESS YOU'VE REVIEWED AND TESTED :)
        // Needs work to make robust: check property type's class has default ctor and so on.
        // Can also filter out interfaces as these will be auto-subbed.
        public static T SubFor<T>() where T : class
        {
            var gettableVirtualProps = typeof(T).GetProperties()
                .Where(x => x.CanRead && x.GetGetMethod().IsVirtual)
                .Select(x => x);

            var sub = Substitute.For<T>();
            foreach (var prop in gettableVirtualProps)
            {
                var subForProperty = Substitute.For(new[] { prop.PropertyType }, new object[0]);
                var value = prop.GetValue(sub, null);
                value.Returns(subForProperty);
            }
            return sub;
        }
    
        public abstract class A { public abstract void AStuff(); public virtual void VirtualAStuff() { } }
        public abstract class B { public abstract void BStuff(); }
        public class Foo
        {
            public virtual A A { get; set; }
            public virtual B B { get; set; }
        }

        [Test]
        public void TestAutoSubForAllProperties()
        {
            var sub = SubFor<Foo>();

            Assert.NotNull(sub.A);
            Assert.NotNull(sub.B);

            sub.A.VirtualAStuff();
            sub.A.Received().VirtualAStuff();
        }