public void Can_check_whether_customer_is_registered()
        {
            var customer = new Customer();
            customer.CustomerRoles.Add(new CustomerRole()
            {
                Active = true,
                Name = "Administrators",
                SystemName = SystemCustomerRoleNames.Administrators
            });

            customer.CustomerRoles.Add(new CustomerRole()
            {
                Active = true,
                Name = "Guests",
                SystemName = SystemCustomerRoleNames.Guests
            });

            customer.IsRegistered().ShouldBeFalse();

            customer.CustomerRoles.Add(
                new CustomerRole()
                {
                    Active = true,
                    Name = "Registered",
                    SystemName = SystemCustomerRoleNames.Registered
                });
            customer.IsRegistered().ShouldBeTrue();
        }