Not sure. I have 12 division 1 soccer players this summer, not one went through ODP after about U14. I would guess some fitness test (ala Beep, cooper, the common fitness tests etc).
I have had one player a few years ago (U14), was told he was too slow, but they had never formally tested his speed, was made on observation only.
I have found it common for coaches to cut players (or demote them to the B teams) for “lack of speed.” My response to parent is “so your kid was the slowest kid on the team?”
Typically they say no. It appears “lack of fitness”, “lack of speed” etc are excuses to eliminate players without telling them they aren’t good enough. I had one coach tell a U11 girl, she has everything, just needs speed… so she plays on B team 
Must not have everything else then.