Testing for microservices

I have an application which consists of a few microservices. For example:

• Authnenticate service
• Messanger service.

To auth I use JWT. If I want to test API in "Messanger service" first I have to get JWT from "Authnenticate service". But send request to production "Authnenticate service" it's bad idea (I think so).

I see a few solutions:

• Use "hardcode" JWT in my unittest.
• Turn off auth check in my api for unittests.

How do you make unittests in that case?