import * as assert from 'assert' ; import { get } from '../../store' ; import { spring , tweened } from '../../motion' ; describe ( 'motion' , ( ) => { describe ( 'spring' , ( ) => { it ( 'handles initially undefined values' , ( ) => { const size = spring ( ) ; size . set ( 100 ) ; assert . equal ( get ( size ) , 100 ) ; } ) ; } ) ; describe ( 'tweened' , ( ) => { it ( 'handles initially undefined values' , ( ) => { const size = tweened ( ) ; size . set ( 100 ) ; assert . equal ( get ( size ) , 100 ) ; } ) ; it ( 'sets immediately when duration is 0' , ( ) => { const size = tweened ( 0 ) ; size . set ( 100 , { duration : 0 } ) ; assert . equal ( get ( size ) , 100 ) ; } ) ; } ) ; } ) ;