When you are trying to reach out to your subscribers, you would want to make sure everything goes right the first time around. This is where A/B Testing can help to find the best message variant which would lead to higher conversions.
A/B testing allows you to compare two variants of the notification by sending it to select portions of your subscriber base. You can try different copy, images, call to action, or any combination of these to make sure you have the best chances for a conversion.
The test size is determined automatically based on the audience you choose. The winner is determined based on click through and other positive signals related to a notification. Once the winner is chosen, that notification is sent to the remaining target audience.
It is very easy to setup a A/B testing campaign: