Hello dear community, I just want to make sure my code looks good to go. Basically I created an email trigger that I want to upload into the production now.
Its purpose is: When a new account is added, an email template with pdf attachment is supposed to be sent automatically to that person. Please have a look on the code and tell if you think that's going to do it because I couldnt test it in sandbox, just made sure it works with the test class:
Thanks a lot :)

(main class)
public class HelperContactTrigger {
    //static method
    public static List<Account> sendEmail(List<Account> accounts) {

        //query on template object
        EmailTemplate et=[Select id from EmailTemplate where name= 'MCM'];

        system.debug(et);   //debug to check the template

        //list of emails
        List<Messaging.SingleEmailMessage> emails = new List<Messaging.SingleEmailMessage>();

        //loop
        for(Account con : accounts){

            //check for Account
            if(con.PersonEmail != '' && con.PersonEmail != null) {

                //initiallize messaging method
                Messaging.SingleEmailMessage singleMail = new Messaging.SingleEmailMessage();

                //set object Id
                singleMail.setTargetObjectId(con.Id);

                //set template Id
                singleMail.setTemplateId(et.Id);

                //flag to false to stop inserting activity history
                singleMail.setSaveAsActivity(false);

                //add mail
                emails.add(singleMail);
            }
        }

        //send mail
        Messaging.sendEmail(emails);

        return accounts;
    }
}

(test class)
@isTest(SeeAllData=true)
private class HelperContactTriggerTestneu {
public static testMethod void myTestMethod() {

 
        system.debug('### NewAccountTest ###');
        Account acc = new Account(Name = 'Test Test');
      
        {
        insert acc;

        List<Account> sendMail = [select id,PersonEmail from account where (Name='Test Test') and id=:acc.id];
        
        
        test.startTest();

        HelperContactTrigger.sendEmail(sendMail);
        test.stopTest();
        System.assert(acc !=null);
        }
        }
        }

(trigger)
trigger MailAusloeser on Account (after insert) {
 
 if(Trigger.isAfter){
        if(Trigger.isInsert ){ 
            //helper class for single email but bulk messages
            HelperContactTrigger.sendEmail(trigger.new);
        }
    }
}