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Listing all those directories to the Makefile does seem very brittle and will certainly be a maintenance hassle. OTOH, there is something to be said for being explicit about what gets installed. I suppose you could add the find step to ./configure and pass the list into the Makefile. Dunno if that is really is a good idea, though.
In any case, if a reminder isn't already there, perhaps one should be added to the devguide or packaging docs about this when adding test directories.
Also you may want to add some of the packaging test directories to those excluded in the calls to compileall.py a little further down in the libinstall target.