public void ProvidesPartsOfBuiltin()
{
using (var fake = new AutoSubstitute())
{
var bar = fake.ProvidePartsOf <IBar, Bar>();
bar.When(x => x.Fuzz()).DoNotCallBase();
bar.Fuzz().Returns("Fuzz");
var foo = fake.Resolve <Foo>();
var result = foo.Fuzz();
Assert.Equal("Fuzz", result);
}
}