DiagramGrid: Test how DiagramGrid lays out a cube diagram.
DiagramGrid: Test how DiagramGrid lays out a cube diagram.

The new test requires DiagramGrid to lay out a cube.  Rather obviously,
the result is not a cube, because of how DiagramGrid is designed.

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