Some cleanup for test_bessel.py:
Some cleanup for test_bessel.py:

    * don't select random numbers by hand in tests
    * test expand_func both numerically and
      symbolically with check() helper

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