public void Can_remove_address_assigned_as_billing_address()
{
var customer = new Customer();
var address = new Address { Id = 1 };
customer.Addresses.Add(address);
customer.BillingAddress = address;
customer.BillingAddress.ShouldBeTheSameAs(customer.Addresses.First());
customer.RemoveAddress(address);
customer.Addresses.Count.ShouldEqual(0);
customer.BillingAddress.ShouldBeNull();
}