Test users in Test Data

Good morning All!
I just installed Gibbon for testing purpose on my school server as I intend to use it this next school year.
I have installed the Test Data, and would like now to play around with different users role.
Is there a table with test users Login/Password? Or should I as admin reset passwords for the different users?
Thanks for your help!

For testing the easiest may be to assign all roles to admin.

You can then easily switch roles using the role switcher in the start page.