Add extra test for SubclassTracking.
Add extra test for SubclassTracking.

sfroehler/sidetiq,brennovich/sidetiq,PaulMest/sidetiq,akhiln/sidetiq,tobiassvn/sidetiq,rjocoleman/sidetiq,kickserv/sidetiq,b1tw1se/sidetiq,tobiassvn/sidetiq,tomoyuki-yanagisawa/sidetiq-mod,slategroup/sidetiq,Altonymous/sidetiq,PaulMest/sidetiq,sfroehler/sidetiq,talentpad/sidetiq,tomoyuki-yanagisawa/sidetiq-mod,slategroup/sidetiq,stanchan/sidetiq,flowerett/sidetiq,vayu-technology/sidetiq,grzlus/sidetiq,danilogcarolino/sidetiq,akhiln/sidetiq,kickserv/sidetiq,atpay/sidetiq,danilogcarolino/sidetiq,endofunky/sidetiq,flowerett/sidetiq,b1tw1se/sidetiq,talentpad/sidetiq,atpay/sidetiq,brennovich/sidetiq,endofunky/sidetiq,rjocoleman/sidetiq,vayu-technology/sidetiq,grzlus/sidetiq,stanchan/sidetiq