Added tests for physics_quantum_density
Added tests for physics_quantum_density

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