Hi Brenda64,
This is a great question and I can clarify this situation. When it comes to direct deposit for payroll, the test transaction is only sent out to verify the employer's bank account. That means in this situation there wouldn't be another test amount sent because the changes were made to the employee's direct deposit information. If you make changes to the employer information, that's when you'd see the test again. Check out the article I linked to get a refresher on the process and learn more.
I hope this helps. Let me know if you have more questions!