TST: Add tests for IIR filter functions
TST: Add tests for IIR filter functions

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