TST: for integer overflow when concatenating sparse matrices
TST: for integer overflow when concatenating sparse matrices

tests #7735 as suggested by @pv
grlee77/scipy,andyfaff/scipy,pizzathief/scipy,mdhaber/scipy,matthew-brett/scipy,aeklant/scipy,anntzer/scipy,grlee77/scipy,anntzer/scipy,tylerjereddy/scipy,anntzer/scipy,Stefan-Endres/scipy,perimosocordiae/scipy,arokem/scipy,nmayorov/scipy,lhilt/scipy,e-q/scipy,jor-/scipy,zerothi/scipy,aarchiba/scipy,rgommers/scipy,aarchiba/scipy,scipy/scipy,Eric89GXL/scipy,andyfaff/scipy,andyfaff/scipy,e-q/scipy,ilayn/scipy,jamestwebber/scipy,andyfaff/scipy,perimosocordiae/scipy,person142/scipy,mdhaber/scipy,perimosocordiae/scipy,aeklant/scipy,arokem/scipy,zerothi/scipy,jamestwebber/scipy,grlee77/scipy,lhilt/scipy,lhilt/scipy,e-q/scipy,rgommers/scipy,gertingold/scipy,gertingold/scipy,ilayn/scipy,lhilt/scipy,Stefan-Endres/scipy,vigna/scipy,matthew-brett/scipy,Eric89GXL/scipy,aarchiba/scipy,ilayn/scipy,nmayorov/scipy,endolith/scipy,Stefan-Endres/scipy,gertingold/scipy,ilayn/scipy,Eric89GXL/scipy,zerothi/scipy,e-q/scipy,zerothi/scipy,tylerjereddy/scipy,person142/scipy,endolith/scipy,jor-/scipy,perimosocordiae/scipy,lhilt/scipy,e-q/scipy,anntzer/scipy,jamestwebber/scipy,person142/scipy,aeklant/scipy,person142/scipy,arokem/scipy,andyfaff/scipy,rgommers/scipy,ilayn/scipy,gfyoung/scipy,jor-/scipy,jor-/scipy,gfyoung/scipy,gertingold/scipy,mdhaber/scipy,mdhaber/scipy,gfyoung/scipy,WarrenWeckesser/scipy,arokem/scipy,rgommers/scipy,gfyoung/scipy,grlee77/scipy,tylerjereddy/scipy,Eric89GXL/scipy,perimosocordiae/scipy,jor-/scipy,person142/scipy,pizzathief/scipy,grlee77/scipy,matthew-brett/scipy,Stefan-Endres/scipy,Stefan-Endres/scipy,endolith/scipy,mdhaber/scipy,scipy/scipy,tylerjereddy/scipy,zerothi/scipy,pizzathief/scipy,WarrenWeckesser/scipy,ilayn/scipy,aeklant/scipy,WarrenWeckesser/scipy,Eric89GXL/scipy,gfyoung/scipy,scipy/scipy,gertingold/scipy,scipy/scipy,rgommers/scipy,endolith/scipy,vigna/scipy,endolith/scipy,andyfaff/scipy,aarchiba/scipy,pizzathief/scipy,jamestwebber/scipy,pizzathief/scipy,nmayorov/scipy,WarrenWeckesser/scipy,vigna/scipy,scipy/scipy,tylerjereddy/scipy,mdhaber/scipy,Eric89GXL/scipy,nmayorov/scipy,scipy/scipy,vigna/scipy,WarrenWeckesser/scipy,Stefan-Endres/scipy,arokem/scipy,endolith/scipy,matthew-brett/scipy,perimosocordiae/scipy,aarchiba/scipy,zerothi/scipy,vigna/scipy,anntzer/scipy,matthew-brett/scipy,jamestwebber/scipy,nmayorov/scipy,WarrenWeckesser/scipy,aeklant/scipy,anntzer/scipy