public void SetUp()
{
_registrar = MockRepository.GenerateStub<IRegistrar>();
_builder = ((registry, info) => ctx => ctx.PropertyValue);
_matches = (info => info.Name == "SomeProperty");
_property = typeof(PropertyHolder).GetProperty("SomeProperty");
_registrar.Stub(r => r.Register(Arg<ConverterFamily>.Matches(f=>f.Matches(_property))));
_expression = new ConverterExpression(_matches, _registrar.Register);
}