Speaking of root,
the other tests never invoked SuperUser to ask for root permissions, this could explain why you wheren't able to open the DB.
After running this latest APK, though, I checked permissions on the DB and it was the same as before:
Code:
# busybox ls -ln
total 404
-rw-rw---- 1 10000 10000 48128 Jan 31 11:58 external-469fe3eb.db
-rw-rw---- 1 10000 10000 357376 Jan 31 11:58 internal.db
where 10000 is the uid/gid of app_0