Massive update for user account's passwords

Hello experts,

For our customer we need to create 100 users at QA system (for testing purposes). The idea is to set the same password for all of them. For that purpose, I will set my mail account for all these users and I will receive all the mails with every user account data and the idea is to set the same password for all of them.

Do you know if there is any way to change all the passwords at once instead of doing one by one (by accessing to the system with every user account and change its password)?

Thanks and best regards,

Isaac