Add basic tests for zi argument.
Add basic tests for zi argument.

Shaswat27/scipy,sonnyhu/scipy,zerothi/scipy,rgommers/scipy,cpaulik/scipy,dch312/scipy,vigna/scipy,perimosocordiae/scipy,vanpact/scipy,petebachant/scipy,gfyoung/scipy,minhlongdo/scipy,tylerjereddy/scipy,Kamp9/scipy,hainm/scipy,minhlongdo/scipy,vberaudi/scipy,efiring/scipy,anielsen001/scipy,ales-erjavec/scipy,maciejkula/scipy,jakevdp/scipy,bkendzior/scipy,maciejkula/scipy,gfyoung/scipy,hainm/scipy,trankmichael/scipy,WarrenWeckesser/scipy,jseabold/scipy,mortada/scipy,ndchorley/scipy,fredrikw/scipy,mtrbean/scipy,raoulbq/scipy,aman-iitj/scipy,surhudm/scipy,andim/scipy,petebachant/scipy,witcxc/scipy,behzadnouri/scipy,kalvdans/scipy,mtrbean/scipy,andim/scipy,kalvdans/scipy,zxsted/scipy,pschella/scipy,Newman101/scipy,cpaulik/scipy,anielsen001/scipy,teoliphant/scipy,Kamp9/scipy,gef756/scipy,person142/scipy,raoulbq/scipy,matthew-brett/scipy,endolith/scipy,maniteja123/scipy,njwilson23/scipy,witcxc/scipy,minhlongdo/scipy,raoulbq/scipy,vigna/scipy,fredrikw/scipy,Gillu13/scipy,Eric89GXL/scipy,mikebenfield/scipy,pizzathief/scipy,matthewalbani/scipy,gertingold/scipy,teoliphant/scipy,mortonjt/scipy,witcxc/scipy,cpaulik/scipy,gertingold/scipy,piyush0609/scipy,tylerjereddy/scipy,josephcslater/scipy,e-q/scipy,fernand/scipy,Eric89GXL/scipy,haudren/scipy,pizzathief/scipy,chatcannon/scipy,piyush0609/scipy,dch312/scipy,pschella/scipy,sonnyhu/scipy,larsmans/scipy,grlee77/scipy,newemailjdm/scipy,WarrenWeckesser/scipy,zaxliu/scipy,mortada/scipy,mortonjt/scipy,maniteja123/scipy,maciejkula/scipy,Newman101/scipy,arokem/scipy,mikebenfield/scipy,pizzathief/scipy,mikebenfield/scipy,richardotis/scipy,gef756/scipy,scipy/scipy,ilayn/scipy,arokem/scipy,pschella/scipy,jseabold/scipy,mortonjt/scipy,chatcannon/scipy,mtrbean/scipy,aarchiba/scipy,ortylp/scipy,trankmichael/scipy,jor-/scipy,gdooper/scipy,raoulbq/scipy,anntzer/scipy,ilayn/scipy,argriffing/scipy,lukauskas/scipy,Stefan-Endres/scipy,fernand/scipy,ndchorley/scipy,gertingold/scipy,ndchorley/scipy,WillieMaddox/scipy,vberaudi/scipy,zerothi/scipy,vhaasteren/scipy,matthewalbani/scipy,jsilter/scipy,aeklant/scipy,zxsted/scipy,futurulus/scipy,chatcannon/scipy,futurulus/scipy,Shaswat27/scipy,scipy/scipy,felipebetancur/scipy,mingwpy/scipy,aman-iitj/scipy,anntzer/scipy,perimosocordiae/scipy,petebachant/scipy,teoliphant/scipy,gfyoung/scipy,dominicelse/scipy,WillieMaddox/scipy,aman-iitj/scipy,perimosocordiae/scipy,jsilter/scipy,rmcgibbo/scipy,Shaswat27/scipy,petebachant/scipy,endolith/scipy,andyfaff/scipy,rgommers/scipy,vanpact/scipy,njwilson23/scipy,lhilt/scipy,aman-iitj/scipy,aman-iitj/scipy,vanpact/scipy,mhogg/scipy,aeklant/scipy,Dapid/scipy,bkendzior/scipy,njwilson23/scipy,pizzathief/scipy,Stefan-Endres/scipy,matthew-brett/scipy,scipy/scipy,aman-iitj/scipy,andyfaff/scipy,WarrenWeckesser/scipy,sriki18/scipy,fredrikw/scipy,anntzer/scipy,WillieMaddox/scipy,kleskjr/scipy,kleskjr/scipy,Eric89GXL/scipy,argriffing/scipy,andim/scipy,FRidh/scipy,sriki18/scipy,vberaudi/scipy,efiring/scipy,nonhermitian/scipy,vanpact/scipy,fredrikw/scipy,vberaudi/scipy,endolith/scipy,pyramania/scipy,giorgiop/scipy,behzadnouri/scipy,andyfaff/scipy,haudren/scipy,matthew-brett/scipy,jamestwebber/scipy,ogrisel/scipy,sonnyhu/scipy,Gillu13/scipy,raoulbq/scipy,zerothi/scipy,andim/scipy,lhilt/scipy,jor-/scipy,felipebetancur/scipy,fredrikw/scipy,jakevdp/scipy,matthewalbani/scipy,sauliusl/scipy,jjhelmus/scipy,minhlongdo/scipy,vanpact/scipy,pbrod/scipy,witcxc/scipy,person142/scipy,mortada/scipy,endolith/scipy,ilayn/scipy,giorgiop/scipy,efiring/scipy,surhudm/scipy,jjhelmus/scipy,hainm/scipy,rmcgibbo/scipy,arokem/scipy,grlee77/scipy,WillieMaddox/scipy,zaxliu/scipy,ortylp/scipy,lukauskas/scipy,efiring/scipy,sriki18/scipy,giorgiop/scipy,ilayn/scipy,juliantaylor/scipy,arokem/scipy,maniteja123/scipy,juliantaylor/scipy,argriffing/scipy,jonycgn/scipy,jonycgn/scipy,sonnyhu/scipy,pnedunuri/scipy,pschella/scipy,apbard/scipy,mdhaber/scipy,andyfaff/scipy,mdhaber/scipy,WillieMaddox/scipy,anielsen001/scipy,mtrbean/scipy,mgaitan/scipy,aeklant/scipy,vhaasteren/scipy,njwilson23/scipy,befelix/scipy,rmcgibbo/scipy,FRidh/scipy,vigna/scipy,jsilter/scipy,chatcannon/scipy,petebachant/scipy,FRidh/scipy,sriki18/scipy,Dapid/scipy,jamestwebber/scipy,nonhermitian/scipy,teoliphant/scipy,sriki18/scipy,jsilter/scipy,fredrikw/scipy,Newman101/scipy,FRidh/scipy,rmcgibbo/scipy,felipebetancur/scipy,e-q/scipy,nmayorov/scipy,apbard/scipy,sargas/scipy,matthewalbani/scipy,Srisai85/scipy,Kamp9/scipy,endolith/scipy,vhaasteren/scipy,haudren/scipy,maniteja123/scipy,josephcslater/scipy,zxsted/scipy,nvoron23/scipy,WarrenWeckesser/scipy,Dapid/scipy,jjhelmus/scipy,josephcslater/scipy,futurulus/scipy,tylerjereddy/scipy,ogrisel/scipy,kleskjr/scipy,maniteja123/scipy,mtrbean/scipy,ortylp/scipy,befelix/scipy,scipy/scipy,mgaitan/scipy,sriki18/scipy,jamestwebber/scipy,cpaulik/scipy,ndchorley/scipy,giorgiop/scipy,piyush0609/scipy,futurulus/scipy,perimosocordiae/scipy,mingwpy/scipy,gdooper/scipy,endolith/scipy,tylerjereddy/scipy,aarchiba/scipy,mdhaber/scipy,pyramania/scipy,behzadnouri/scipy,hainm/scipy,lukauskas/scipy,richardotis/scipy,rmcgibbo/scipy,hainm/scipy,WillieMaddox/scipy,cpaulik/scipy,sargas/scipy,gertingold/scipy,kleskjr/scipy,sargas/scipy,person142/scipy,jsilter/scipy,pbrod/scipy,njwilson23/scipy,ortylp/scipy,lukauskas/scipy,dominicelse/scipy,vberaudi/scipy,Stefan-Endres/scipy,jonycgn/scipy,efiring/scipy,pizzathief/scipy,sauliusl/scipy,pnedunuri/scipy,niknow/scipy,grlee77/scipy,Newman101/scipy,mingwpy/scipy,mikebenfield/scipy,mhogg/scipy,felipebetancur/scipy,mtrbean/scipy,vanpact/scipy,FRidh/scipy,pbrod/scipy,fernand/scipy,larsmans/scipy,zxsted/scipy,sargas/scipy,felipebetancur/scipy,perimosocordiae/scipy,aeklant/scipy,jor-/scipy,Srisai85/scipy,andyfaff/scipy,zaxliu/scipy,newemailjdm/scipy,surhudm/scipy,nmayorov/scipy,ales-erjavec/scipy,pyramania/scipy,vhaasteren/scipy,jseabold/scipy,jonycgn/scipy,jakevdp/scipy,trankmichael/scipy,nvoron23/scipy,niknow/scipy,josephcslater/scipy,ilayn/scipy,Srisai85/scipy,pyramania/scipy,mortonjt/scipy,Stefan-Endres/scipy,ogrisel/scipy,behzadnouri/scipy,mortada/scipy,ChanderG/scipy,sauliusl/scipy,befelix/scipy,dominicelse/scipy,jamestwebber/scipy,ilayn/scipy,nvoron23/scipy,Kamp9/scipy,njwilson23/scipy,scipy/scipy,befelix/scipy,witcxc/scipy,Stefan-Endres/scipy,ChanderG/scipy,apbard/scipy,ogrisel/scipy,Kamp9/scipy,mortada/scipy,ales-erjavec/scipy,person142/scipy,nvoron23/scipy,giorgiop/scipy,rgommers/scipy,mdhaber/scipy,sauliusl/scipy,maciejkula/scipy,haudren/scipy,zerothi/scipy,futurulus/scipy,Srisai85/scipy,mhogg/scipy,argriffing/scipy,zerothi/scipy,mhogg/scipy,piyush0609/scipy,matthewalbani/scipy,vigna/scipy,mikebenfield/scipy,richardotis/scipy,bkendzior/scipy,mhogg/scipy,e-q/scipy,lhilt/scipy,mhogg/scipy,lhilt/scipy,trankmichael/scipy,anntzer/scipy,grlee77/scipy,Gillu13/scipy,mgaitan/scipy,zxsted/scipy,Eric89GXL/scipy,nonhermitian/scipy,zxsted/scipy,mingwpy/scipy,gef756/scipy,pbrod/scipy,Dapid/scipy,behzadnouri/scipy,richardotis/scipy,ales-erjavec/scipy,jonycgn/scipy,scipy/scipy,juliantaylor/scipy,larsmans/scipy,surhudm/scipy,ogrisel/scipy,jjhelmus/scipy,rgommers/scipy,arokem/scipy,piyush0609/scipy,aarchiba/scipy,nvoron23/scipy,mortada/scipy,gfyoung/scipy,vigna/scipy,gertingold/scipy,WarrenWeckesser/scipy,bkendzior/scipy,trankmichael/scipy,jor-/scipy,maniteja123/scipy,perimosocordiae/scipy,ChanderG/scipy,trankmichael/scipy,ortylp/scipy,efiring/scipy,Newman101/scipy,Newman101/scipy,ChanderG/scipy,niknow/scipy,haudren/scipy,mingwpy/scipy,zaxliu/scipy,minhlongdo/scipy,nonhermitian/scipy,ndchorley/scipy,Gillu13/scipy,anielsen001/scipy,gfyoung/scipy,Dapid/scipy,mgaitan/scipy,mortonjt/scipy,maciejkula/scipy,ChanderG/scipy,ortylp/scipy,sonnyhu/scipy,andim/scipy,pbrod/scipy,Shaswat27/scipy,aarchiba/scipy,richardotis/scipy,mgaitan/scipy,surhudm/scipy,woodscn/scipy,Srisai85/scipy,newemailjdm/scipy,teoliphant/scipy,niknow/scipy,pnedunuri/scipy,Srisai85/scipy,Gillu13/scipy,Shaswat27/scipy,pbrod/scipy,juliantaylor/scipy,sauliusl/scipy,pschella/scipy,lukauskas/scipy,pnedunuri/scipy,anntzer/scipy,dch312/scipy,dominicelse/scipy,person142/scipy,fernand/scipy,niknow/scipy,ales-erjavec/scipy,piyush0609/scipy,josephcslater/scipy,lukauskas/scipy,nvoron23/scipy,mgaitan/scipy,pnedunuri/scipy,dch312/scipy,zaxliu/scipy,jamestwebber/scipy,anielsen001/scipy,newemailjdm/scipy,larsmans/scipy,jseabold/scipy,petebachant/scipy,jonycgn/scipy,vhaasteren/scipy,aeklant/scipy,mdhaber/scipy,sargas/scipy,zaxliu/scipy,fernand/scipy,tylerjereddy/scipy,andim/scipy,FRidh/scipy,e-q/scipy,Stefan-Endres/scipy,surhudm/scipy,haudren/scipy,rgommers/scipy,richardotis/scipy,larsmans/scipy,WarrenWeckesser/scipy,ndchorley/scipy,Eric89GXL/scipy,woodscn/scipy,anntzer/scipy,ales-erjavec/scipy,dch312/scipy,chatcannon/scipy,apbard/scipy,sauliusl/scipy,nmayorov/scipy,nmayorov/scipy,gdooper/scipy,hainm/scipy,pyramania/scipy,vberaudi/scipy,gef756/scipy,dominicelse/scipy,woodscn/scipy,gdooper/scipy,jjhelmus/scipy,woodscn/scipy,jseabold/scipy,nonhermitian/scipy,mdhaber/scipy,fernand/scipy,kleskjr/scipy,matthew-brett/scipy,bkendzior/scipy,woodscn/scipy,mingwpy/scipy,kalvdans/scipy,gef756/scipy,aarchiba/scipy,giorgiop/scipy,jakevdp/scipy,jor-/scipy,newemailjdm/scipy,Gillu13/scipy,mortonjt/scipy,kalvdans/scipy,zerothi/scipy,sonnyhu/scipy,niknow/scipy,lhilt/scipy,Kamp9/scipy,Dapid/scipy,minhlongdo/scipy,jakevdp/scipy,cpaulik/scipy,chatcannon/scipy,apbard/scipy,ChanderG/scipy,newemailjdm/scipy,kalvdans/scipy,raoulbq/scipy,woodscn/scipy,gef756/scipy,vhaasteren/scipy,andyfaff/scipy,larsmans/scipy,rmcgibbo/scipy,grlee77/scipy,Shaswat27/scipy,kleskjr/scipy,e-q/scipy,jseabold/scipy,futurulus/scipy,anielsen001/scipy,argriffing/scipy,befelix/scipy,behzadnouri/scipy,pnedunuri/scipy,argriffing/scipy,Eric89GXL/scipy,felipebetancur/scipy,juliantaylor/scipy,nmayorov/scipy,matthew-brett/scipy,gdooper/scipy