[1/2] Add, Mul, Pow: tests for is_comparable
[1/2] Add, Mul, Pow: tests for is_comparable

This patch adds mentioned tests

diofant/diofant,abloomston/sympy,Mitchkoens/sympy,minrk/sympy,moble/sympy,ahhda/sympy,sunny94/temp,wanglongqi/sympy,jaimahajan1997/sympy,fperez/sympy,kaushik94/sympy,abhiii5459/sympy,shikil/sympy,amitjamadagni/sympy,maniteja123/sympy,Sumith1896/sympy,garvitr/sympy,jamesblunt/sympy,yashsharan/sympy,Gadal/sympy,MechCoder/sympy,AunShiLord/sympy,beni55/sympy,MechCoder/sympy,atsao72/sympy,atsao72/sympy,kaushik94/sympy,hazelnusse/sympy-old,hargup/sympy,emon10005/sympy,Arafatk/sympy,ryanGT/sympy,vipulroxx/sympy,wyom/sympy,garvitr/sympy,iamutkarshtiwari/sympy,sahilshekhawat/sympy,sunny94/temp,yashsharan/sympy,lindsayad/sympy,wanglongqi/sympy,Sumith1896/sympy,Shaswat27/sympy,mcdaniel67/sympy,wyom/sympy,skidzo/sympy,jamesblunt/sympy,liangjiaxing/sympy,vipulroxx/sympy,hrashk/sympy,Mitchkoens/sympy,pbrady/sympy,pernici/sympy,Titan-C/sympy,Designist/sympy,Davidjohnwilson/sympy,KevinGoodsell/sympy,mafiya69/sympy,pbrady/sympy,pandeyadarsh/sympy,jaimahajan1997/sympy,kmacinnis/sympy,kevalds51/sympy,cswiercz/sympy,aktech/sympy,debugger22/sympy,atreyv/sympy,saurabhjn76/sympy,Mitchkoens/sympy,shikil/sympy,Curious72/sympy,kevalds51/sympy,debugger22/sympy,maniteja123/sympy,skidzo/sympy,VaibhavAgarwalVA/sympy,kmacinnis/sympy,minrk/sympy,abhiii5459/sympy,oliverlee/sympy,kaushik94/sympy,lindsayad/sympy,Curious72/sympy,meghana1995/sympy,skirpichev/omg,cccfran/sympy,mattpap/sympy-polys,Gadal/sympy,chaffra/sympy,saurabhjn76/sympy,saurabhjn76/sympy,yukoba/sympy,sunny94/temp,AunShiLord/sympy,Titan-C/sympy,garvitr/sympy,abloomston/sympy,Vishluck/sympy,sampadsaha5/sympy,sahilshekhawat/sympy,postvakje/sympy,Designist/sympy,grevutiu-gabriel/sympy,sampadsaha5/sympy,beni55/sympy,Vishluck/sympy,Curious72/sympy,hrashk/sympy,Shaswat27/sympy,skidzo/sympy,jbbskinny/sympy,mcdaniel67/sympy,AkademieOlympia/sympy,Davidjohnwilson/sympy,postvakje/sympy,sampadsaha5/sympy,Designist/sympy,meghana1995/sympy,AkademieOlympia/sympy,Shaswat27/sympy,souravsingh/sympy,dqnykamp/sympy,sahmed95/sympy,oliverlee/sympy,asm666/sympy,moble/sympy,Titan-C/sympy,souravsingh/sympy,shipci/sympy,jerli/sympy,flacjacket/sympy,emon10005/sympy,ChristinaZografou/sympy,AunShiLord/sympy,Sumith1896/sympy,Gadal/sympy,aktech/sympy,liangjiaxing/sympy,ChristinaZografou/sympy,ga7g08/sympy,atreyv/sympy,jbaayen/sympy,MridulS/sympy,farhaanbukhsh/sympy,rahuldan/sympy,mafiya69/sympy,MridulS/sympy,hargup/sympy,MechCoder/sympy,rahuldan/sympy,madan96/sympy,yukoba/sympy,maniteja123/sympy,hrashk/sympy,jaimahajan1997/sympy,amitjamadagni/sympy,Arafatk/sympy,madan96/sympy,yashsharan/sympy,jerli/sympy,aktech/sympy,kaichogami/sympy,cswiercz/sympy,atreyv/sympy,wyom/sympy,mafiya69/sympy,postvakje/sympy,kumarkrishna/sympy,ahhda/sympy,kaichogami/sympy,bukzor/sympy,AkademieOlympia/sympy,abloomston/sympy,MridulS/sympy,pbrady/sympy,debugger22/sympy,grevutiu-gabriel/sympy,souravsingh/sympy,VaibhavAgarwalVA/sympy,drufat/sympy,liangjiaxing/sympy,dqnykamp/sympy,farhaanbukhsh/sympy,rahuldan/sympy,toolforger/sympy,lindsayad/sympy,shipci/sympy,sahmed95/sympy,moble/sympy,Vishluck/sympy,kmacinnis/sympy,vipulroxx/sympy,cswiercz/sympy,pandeyadarsh/sympy,jamesblunt/sympy,shikil/sympy,asm666/sympy,ChristinaZografou/sympy,iamutkarshtiwari/sympy,ahhda/sympy,pandeyadarsh/sympy,chaffra/sympy,oliverlee/sympy,VaibhavAgarwalVA/sympy,beni55/sympy,mcdaniel67/sympy,cccfran/sympy,farhaanbukhsh/sympy,bukzor/sympy,drufat/sympy,atsao72/sympy,sahilshekhawat/sympy,Arafatk/sympy,srjoglekar246/sympy,grevutiu-gabriel/sympy,chaffra/sympy,dqnykamp/sympy,toolforger/sympy,lidavidm/sympy,asm666/sympy,meghana1995/sympy,wanglongqi/sympy,drufat/sympy,jbbskinny/sympy,kaichogami/sympy,jbbskinny/sympy,cccfran/sympy,tovrstra/sympy,jerli/sympy,kevalds51/sympy,Davidjohnwilson/sympy,kumarkrishna/sympy,toolforger/sympy,kumarkrishna/sympy,shipci/sympy,bukzor/sympy,madan96/sympy,hargup/sympy,ga7g08/sympy,sahmed95/sympy,abhiii5459/sympy,lidavidm/sympy,lidavidm/sympy,yukoba/sympy,emon10005/sympy,ga7g08/sympy,iamutkarshtiwari/sympy,hazelnusse/sympy-old