What is The Best Way To Testing Different User login

Let see in my system we have 10 users with different role.

So every time i define some responsibility like specific Dashboard should visible to this user.

As a admin i will see all so to test it i have created a Generic User  for testing.So every time if i have to to test specific role i have to change this to that role and test it.this i have to do for different different user.

Is there any better way for this scenario like sales force has a feature called login as specific.Is any think like this is there in CRM ??

Thanks,

Rahul Tiwari