Replace coma with new Line using Salesforce Apex

Sample Trigger:
trigger AccountTrigger on Account ( before insert, before update ) {

    for ( Account objAcc : trigger.new ) {
    
        if ( String.isNotBlank( objAcc.Description ) ) {
    
            objAcc.Description = objAcc.Description.replace( ',', '\n' );
        
        }
                  
    }
    
}
 
Test Class for the Trigger:
@isTest
public class AccountTriggerTest {
    
    static testMethod void acctInsertTest() {
        
        Account objAcc = new Account( Name = 'Testing', Description = 'A,B' );
        insert objAcc;
        objAcc = [ SELECT Description FROM Account WHERE Id =: objAcc.Id ];
        System.assertEquals( objAcc.Description, 'A\nB' );
        
    }
    
}

Output: