"We will perform flight tests when all of those activities have been successfully finished, and from those flights tests, we will be able to define crew training requirements." EASA
It will be interesting to see who EASA recruit for their flight testing and whether they use 737 without MAX experience, unlike the FAA. I would say that if they are looking at crew training to convert to the MAX they should only conduct flight tests with pilots with no previous experience of the MAX.