export default { test ( { assert , component , target , window , raf } ) { component . visible = true ; const div = target . querySelector ( 'div' ) ; assert . equal ( window . getComputedStyle ( div ) . opacity , 0 ) ; raf . tick ( 200 ) ; assert . equal ( window . getComputedStyle ( div ) . opacity , 0.5 ) ; raf . tick ( 400 ) ; assert . equal ( window . getComputedStyle ( div ) . opacity , 1 ) ; raf . tick ( 500 ) ; } } ;