Fix test to use wait time
Fix test to use wait time

`Backburner#setTimeout` requires wait time.

ebryn/backburner.js,asakusuma/backburner.js,stefanpenner/backburner.js,givanse/backburner.js,greyhwndz/backburner.js,BackburnerJS/backburner.js,BackburnerJS/backburner.js,greyhwndz/backburner.js,asakusuma/backburner.js,BackburnerJS/backburner.js,givanse/backburner.js,ebryn/backburner.js