In reply to tfitz:
Thanks for the suggestions. I went with the “my_tr.randomize() with { [list all the constraints] }” approach, such that I can extend a sequence/test pair each time I add a test. This worked. One drawback of this approach is, in the future if I add several tests, and then need to add/modify a constraint in the base sequence, I’ll need to make that same change in every extended sequence.