You don't understand the basics of how your hormones work if you are asking this question - you need to do more research before you start a cycle. Your body makes use of testosterone and downstream hormones that are produced out of it, and you need to understand what they are and what they do, as well as the impact taking exogenous AAS has on their production.
For the overwhelming majority of people and situations, test should always be a part of your cycle. There are some exceptions, but none of them are beginner friendly, and generally are not preferred even by intermediate or advanced users. People using them have specific reasons they do them, and they still have to take specific actions to manage the lack of testosterone.
Anavar is suppressive. At low enough doses the effect might not be enough to totally tank your test production, but it's also not like anavar at those doses is going to be particularly effective at packing on muscle, either, so there's not much point.
