TokuDB 5.6 implements MRR but has no tests for it. There are tests for innodb such as main.innodb_mrr and use common include/mrr_tests.inc and some specialty tests for InnoDB that uld probably also apply to TokuDB.
TokuDB 5.7 mrr is compiled out at the moment and doesn't function. Port the test forward anyway but disable it until
TDB-135 fixes 5.7 MRR.