Add tests for Sidetiq::Schedule.
Add tests for Sidetiq::Schedule.

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