Added negative tests for field_isomorphism()
Added negative tests for field_isomorphism()

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