I have seen the follow MS blogpost about using the OOTB demo users to test config in an environment, but this seems to only apply to Dynamics 365 Finance & Operations/Dynamics AX: https://cloudblogs.microsoft.com/dynamics365/no-audience/2016/03/17/how-do-i-login-to-the-new-ax-as-a-demo-user-persona/
Is it possible to do something similar to log in as demo users for testing the config in other distributions of Dynamics 365? This is an incredibly important ability, but I can't seem to find anything on it!