It is possible to preview your notification with a live booking.
All you need to do is to select the notification for which you want to see the content, then click on show
On the next screen, you will see the option Preview a booking
There you can enter the booking reference in the field and click preview. (make sure there is no space at the end of the booking reference).
The content of that notification will then appear on the right side.
Please note that this will show only the content of the notification, not including the subject and any attachments.
You can also send the results in an email by adding an email address and clicking the send test notification button. Please note that you will receive an email for each language for which that notification is configured to.