How do I mock user for test purposes?

Previously we handled all auth logic manually, saving user info in cookies, handling all the refreshing logic by ourselves, etc. Now we switched to auth0-vue since we migrated to vue 3, but we have e2e test where we need to test new user flow and previously we could just replace cookie and call it a day - no need to create new user each time, but now, when all the auth logic happens under the hood, it become quite impossible to do the same. But we don’t want to register a new user every time.

Any ideas on how to solve it?