Updated tests for set imports. 
Updated tests for set imports. 
enzochiau/tablib,whix/tablib,leohmoraes/tablib,klothe/tablib,alex/tablib,screwt/tablib,steveb/tablib,zhengzhihust/tablib,tommyanthony/tablib,klothe/tablib,bopo/tablib,leohmoraes/tablib,mloesch/tablib,bopo/tablib,durden/tablib,whix/tablib,godfreyy/tablib,mloesch/tablib,enzochiau/tablib,screwt/tablib,kennethreitz/tablib,steveb/tablib,godfreyy/tablib,zhengzhihust/tablib