Set Password on Test User Account in Localhost
If you have access to the database you can change the user's password to: $2y$13$FfVKvo1W1N5Gsba3c19r8uz.x9R5NRQgRu8jmXvOjVCStg1sKGcoW which is 'secret' when un-hashed.

Source: https://twitter.com/nystudio107/status/1063135843441954816