DBMakerTest: add heap engien test
DBMakerTest: add heap engien test

jankotek/mapdb,binarytemple/mapdb,cocosli/mapdb,morfeo8marc/mapdb,hangum/mapdb,pettermahlen/mapdb,jankotek/MapDB,SleimanJneidi/mapdb,codeaudit/mapdb,jankotek/MapDB,jankotek/mapdb,ffjiao/mapdb,lamfire/mapdb,ringoluo/mapdb,sumit784/mapdb