I am using nBuilder to populate an object graph, but it is only populating the value types. I want it to populate the reference types (related objects).
NBuilder doesn't support automatically populating reference types at this time.
However, it is possible to do what you're wanting by using a builder to create each reference type.
At the moment you are probably doing this:
var person = Builder<Person>
.CreateNew()
.Build();
Assert.That(person.Name, Is.EqualTo("Name1"));
Assert.That(person.Address, Is.Null);
What you want to be doing is this:
var address = Builder<Address>
.CreateNew()
.Build();
var person2 = Builder<Person>
.CreateNew()
.With(x => x.Address = address)
.Build();
Assert.That(person2.Name, Is.EqualTo("Name1"));
Assert.That(person2.Address, Is.Not.Null);
Assert.That(person2.Address.Street, Is.EqualTo("Street1"));
Assert.That(person2.Address.Zipcode, Is.EqualTo("Zipcode1"));