In order to do AB Testing you can set multiple URLs (variations) and these URL-s will be rotated on one "Base URL". These URLs must be internal and can be eg. nodes, listers.

In other words, if a user visits the base URL, they will be redirected to a variation, or they'll stay on the base URL, depending on the odds set in the test.

The results of the test can be checked in Google Analytics (eg. Bounce rate, Avg. Session Duration, Custom Goals), so you will be able to compare the effectiveness of the variations.