Sql Server Fix Users

Question

I Create a user in my database with following command :

CREATE USER Test WITHOUT LOGIN

I created a login with the Test Name.

I want to link Test user with Test Login.

When I use following command :

EXEC sp_change_users_login 'Update_One', 'Test', 'Test'

SQL Server raised bellow error :

Msg 15291, Level 16, State 1, Procedure sp_change_users_login, Line 114
Terminating this procedure. The User name 'Test' is absent or invalid.

And when I use following command :

ALTER USER Test WITH LOGIN = Test

SQL Server Raised Bellow error :

Msg 33016, Level 16, State 1, Line 2
The user cannot be remapped to a login. Remapping can only be done for users that were mapped to Windows or SQL logins.

How can I link a Test user with Test login.

My purpose of this link : I want to restore a database from a server to another server and after complete restoring, map users with existing login on the server.

thanks in advance.