It is not possible to send a test for automated communications.
However, it is possible to make the necessary checks by completing, for example, an entire donation process as an end-user. You will then receive automatic communications.
This is the best way to avoid errors and to get a complete overview. It also allows you to test the other components of the process (web page, forms, etc).
You can use the payment simulator temporarily to avoid actually paying.
To find out about your communications configurations, consult the articles in the help centre in the Communications section.