import React from "react" ; import TestRenderer from "react-test-renderer" ; import { act } from "coral-framework/testHelpers" ; import { PropTypesOf } from "coral-ui/types" ; import Delay from "./Delay" ; it ( "renders correctly" , ( ) => { jest . useFakeTimers ( ) ; try { const props = { children : "custom" , ms : 3000 , } ; const renderer = TestRenderer . create ( < Delay { ... props } > Hello < /Delay>); expect ( renderer . toJSON ( ) ) . toMatchSnapshot ( ) ; act ( ( ) => { jest . advanceTimersByTime ( 3000 ) ; } ) ; expect ( renderer . toJSON ( ) ) . toMatchSnapshot ( ) ; } finally { jest . useRealTimers ( ) ; } } ) ;