test/test_rank_filter_base.cxx: Add stub to test the base API.
test/test_rank_filter_base.cxx: Add stub to test the base API.

nanshe-org/rank_filter,nanshe-org/rank_filter,DudLab/rank_filter,DudLab/rank_filter,nanshe-org/rank_filter,jakirkham/rank_filter,jakirkham/rank_filter,DudLab/rank_filter,jakirkham/rank_filter