add test for #2193
add test for #2193

pdufour/sqlalchemy,wfxiang08/sqlalchemy,bdupharm/sqlalchemy,ThiefMaster/sqlalchemy,epa/sqlalchemy,Cito/sqlalchemy,itkovian/sqlalchemy,EvaSDK/sqlalchemy,elelianghh/sqlalchemy,inspirehep/sqlalchemy,epa/sqlalchemy,halfcrazy/sqlalchemy,pdufour/sqlalchemy,elelianghh/sqlalchemy,davidjb/sqlalchemy,alex/sqlalchemy,Cito/sqlalchemy,itkovian/sqlalchemy,WinterNis/sqlalchemy,dstufft/sqlalchemy,brianv0/sqlalchemy,hsum/sqlalchemy,sqlalchemy/sqlalchemy,bootandy/sqlalchemy,robin900/sqlalchemy,j5int/sqlalchemy,wfxiang08/sqlalchemy,graingert/sqlalchemy,sandan/sqlalchemy,wujuguang/sqlalchemy,sandan/sqlalchemy,zzzeek/sqlalchemy,inspirehep/sqlalchemy,j5int/sqlalchemy,monetate/sqlalchemy,Akrog/sqlalchemy,Cito/sqlalchemy,EvaSDK/sqlalchemy,276361270/sqlalchemy,Akrog/sqlalchemy,graingert/sqlalchemy,davidfraser/sqlalchemy,wujuguang/sqlalchemy,bdupharm/sqlalchemy,robin900/sqlalchemy,davidjb/sqlalchemy,halfcrazy/sqlalchemy,alex/sqlalchemy,davidfraser/sqlalchemy,olemis/sqlalchemy,alex/sqlalchemy,bootandy/sqlalchemy,276361270/sqlalchemy,hsum/sqlalchemy,olemis/sqlalchemy,ThiefMaster/sqlalchemy,dstufft/sqlalchemy,WinterNis/sqlalchemy,brianv0/sqlalchemy,monetate/sqlalchemy