TST: sparse: clean up the test suite
TST: sparse: clean up the test suite

Move indexing tests to appropriate classes splitting some of them into
parts. Remove duplicated tests. Remove dead code. Fix typos.

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