Add a test case for get_user_document
Add a test case for get_user_document

RussellLuo/mongoengine,ProgressivePlanning/mongoengine,prijindal/mongoengine,touilleMan/mongoengine,jimmyshen/mongoengine,nicolascine/mongoengine,ms5/mongoengine,nathanial/mongoengine,Multiposting/mongoengine,cogniteev/mongoengine,iandd0824/mongoengine,MongoEngine/mongoengine,cogniteev/mongoengine,sourcelair/mongoengine,larsbutler/mongoengine,starsirius/mongoengine,gavincabbage/mongoengine,MakerReduxCorp/mongoengine,blaggacao/mongoengine,DavidBord/mongoengine,losintikfos/mongoengine,Catstyle/mongoengine,yarneo/mongoengine,noirbizarre/mongoengine,Davidrjx/mongoengine,khallaghi/mongoengine,WingGao/mongoengine,muhammad-ammar/mongoengine,MRigal/mongoengine,MakerReduxCorp/mongoengine,elephanter/mongoengine,9nix00/mongoengine,eli-b/mongoengine,Davidrjx/mongoengine,reallistic/mongoengine,ConsumerPhysics/mongoengine,gmacon/mongoengine