Add tests for noncommutative symbols.
Add tests for noncommutative symbols.

  - complex
  - conjugate
  - expand
  - factor
  - radsimp
  - simplify
  - subs

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