Add a test for labelfunc
Add a test for labelfunc

kumarkrishna/sympy,souravsingh/sympy,skirpichev/omg,bukzor/sympy,aktech/sympy,shipci/sympy,kmacinnis/sympy,MechCoder/sympy,hrashk/sympy,toolforger/sympy,drufat/sympy,oliverlee/sympy,beni55/sympy,bukzor/sympy,wyom/sympy,AkademieOlympia/sympy,kaushik94/sympy,MridulS/sympy,MechCoder/sympy,iamutkarshtiwari/sympy,jerli/sympy,wanglongqi/sympy,aktech/sympy,abhiii5459/sympy,MridulS/sympy,ahhda/sympy,pbrady/sympy,sunny94/temp,skidzo/sympy,hargup/sympy,garvitr/sympy,yukoba/sympy,Davidjohnwilson/sympy,kmacinnis/sympy,kaushik94/sympy,lindsayad/sympy,sampadsaha5/sympy,ChristinaZografou/sympy,MechCoder/sympy,moble/sympy,yashsharan/sympy,kumarkrishna/sympy,AkademieOlympia/sympy,Vishluck/sympy,chaffra/sympy,atsao72/sympy,kmacinnis/sympy,jerli/sympy,Titan-C/sympy,jbbskinny/sympy,toolforger/sympy,grevutiu-gabriel/sympy,lidavidm/sympy,Arafatk/sympy,atsao72/sympy,wyom/sympy,jamesblunt/sympy,emon10005/sympy,cswiercz/sympy,sampadsaha5/sympy,ga7g08/sympy,sahilshekhawat/sympy,shipci/sympy,wyom/sympy,liangjiaxing/sympy,Mitchkoens/sympy,Gadal/sympy,abhiii5459/sympy,drufat/sympy,beni55/sympy,cccfran/sympy,Arafatk/sympy,sahmed95/sympy,meghana1995/sympy,rahuldan/sympy,ga7g08/sympy,sunny94/temp,postvakje/sympy,grevutiu-gabriel/sympy,meghana1995/sympy,yashsharan/sympy,postvakje/sympy,pbrady/sympy,sunny94/temp,jaimahajan1997/sympy,farhaanbukhsh/sympy,ChristinaZografou/sympy,AunShiLord/sympy,liangjiaxing/sympy,diofant/diofant,garvitr/sympy,emon10005/sympy,lindsayad/sympy,souravsingh/sympy,jaimahajan1997/sympy,Shaswat27/sympy,dqnykamp/sympy,VaibhavAgarwalVA/sympy,Curious72/sympy,garvitr/sympy,sahmed95/sympy,sampadsaha5/sympy,asm666/sympy,kevalds51/sympy,Gadal/sympy,emon10005/sympy,jbbskinny/sympy,chaffra/sympy,VaibhavAgarwalVA/sympy,AkademieOlympia/sympy,oliverlee/sympy,hargup/sympy,abloomston/sympy,madan96/sympy,asm666/sympy,lidavidm/sympy,iamutkarshtiwari/sympy,Arafatk/sympy,Designist/sympy,Vishluck/sympy,Davidjohnwilson/sympy,Gadal/sympy,vipulroxx/sympy,rahuldan/sympy,kaushik94/sympy,skidzo/sympy,mcdaniel67/sympy,pandeyadarsh/sympy,Curious72/sympy,aktech/sympy,dqnykamp/sympy,atreyv/sympy,debugger22/sympy,debugger22/sympy,jbbskinny/sympy,beni55/sympy,meghana1995/sympy,madan96/sympy,oliverlee/sympy,Titan-C/sympy,saurabhjn76/sympy,moble/sympy,maniteja123/sympy,saurabhjn76/sympy,Designist/sympy,Shaswat27/sympy,chaffra/sympy,Mitchkoens/sympy,hrashk/sympy,ahhda/sympy,shikil/sympy,jaimahajan1997/sympy,wanglongqi/sympy,ChristinaZografou/sympy,kaichogami/sympy,mafiya69/sympy,abhiii5459/sympy,shikil/sympy,pbrady/sympy,shikil/sympy,skidzo/sympy,dqnykamp/sympy,rahuldan/sympy,pandeyadarsh/sympy,grevutiu-gabriel/sympy,MridulS/sympy,AunShiLord/sympy,farhaanbukhsh/sympy,cswiercz/sympy,sahilshekhawat/sympy,shipci/sympy,hrashk/sympy,cswiercz/sympy,Davidjohnwilson/sympy,wanglongqi/sympy,souravsingh/sympy,yukoba/sympy,vipulroxx/sympy,abloomston/sympy,Vishluck/sympy,Sumith1896/sympy,Sumith1896/sympy,yashsharan/sympy,mafiya69/sympy,maniteja123/sympy,maniteja123/sympy,ahhda/sympy,VaibhavAgarwalVA/sympy,liangjiaxing/sympy,lindsayad/sympy,atsao72/sympy,mcdaniel67/sympy,vipulroxx/sympy,kumarkrishna/sympy,kaichogami/sympy,cccfran/sympy,jamesblunt/sympy,ga7g08/sympy,atreyv/sympy,yukoba/sympy,toolforger/sympy,saurabhjn76/sympy,pandeyadarsh/sympy,Curious72/sympy,Mitchkoens/sympy,jerli/sympy,sahmed95/sympy,Sumith1896/sympy,atreyv/sympy,lidavidm/sympy,moble/sympy,Titan-C/sympy,kaichogami/sympy,Shaswat27/sympy,debugger22/sympy,kevalds51/sympy,jamesblunt/sympy,madan96/sympy,asm666/sympy,Designist/sympy,drufat/sympy,postvakje/sympy,hargup/sympy,cccfran/sympy,farhaanbukhsh/sympy,iamutkarshtiwari/sympy,sahilshekhawat/sympy,abloomston/sympy,bukzor/sympy,AunShiLord/sympy,kevalds51/sympy,mafiya69/sympy,mcdaniel67/sympy