I feel a need for documentation here - even if it's just a "regression test for RM nnnn" at top of file.
I can't see a bundle named run for run.watch to come from.
I can see that you pass an slist to a used bundle (matching the file name) and that used bundle copies it, but I don't see how any of this relates to check's pass-condition, any - so I can only suppose this is a "crash or parser rejection are the only ways to fail" test; if that's the case, saying so at the top of the file would make it easier for the reader to make sense of what's happening.