Add tests for algorithms in risch.py in a new test_risch.py file
Add tests for algorithms in risch.py in a new test_risch.py file

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