SQL server-Drop user issues

1.The database principal owns a schema in the database, and cannot be dropped

2.User:sa trying to delete a user 'test' which exists in the db 'TestDB'

3.Run the below query to check the result:

USE [test]
GO

SELECT s . name
FROM sys . schemas s
WHERE s . principal_id = USER_ID ( 'ediuser' );

3.Run the following query to change the schema to dbo:

ALTER AUTHORIZATION ON SCHEMA :: db_owner TO dbo ; 
ALTER AUTHORIZATION ON SCHEMA :: db_datareader TO dbo ; 

 4.after completed.it will allow to drop the user