Hi all, i am new to this forum and am not yet a cockapoo owner

But am hoping to be soon!! I have read endless articles about PRA and BVA testing and am still rather confused. Would BVA test for PRA or does there need to be a DNA test to ensure the puppy is not a carrier?
I don't suppose there is anyone out there to explain this to me in simple terms?!! lol
What tests should be carried out to the parents of the puppy and what tests should be carried on the actual puppy?
Just trying to get an idea of what i should be looking at when researching breeders.
Many thanks
Kirsty