I would like to implement visual UI comparison but I don't have the idea on how to implement it. Anyone please give some idea on how to implement visual UI comparison. I know that need to compare the actual and expected screenshot but I don't know when to execute it (Whether it is different test cases or integrate it together to functional testing).
PS: I got an idea - Is it execute all functional testing first then execute visual UI testing?
Please provide some ideas. A billion thanks for your help.