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import React from "react"
import ReactDOM from "react-dom"
import AutoScroll from '../../../components/helpers/AutoScroll'
import { calcVScroll } from '../../../components/helpers/VirtualScroll'
import TestUtils from 'react-dom/test-utils'
describe('Autoscroll', () => {
let mockFn = jest.fn()
class tComponent extends React.Component {
constructor(props, context){
super(props, context)
this.state = { vScroll: calcVScroll() }
}
componentWillUpdate() {
mockFn("foo")
}
componentDidUpdate() {
mockFn("bar")
}
render() {
return (<p>foo</p>)
}
}
it('should update component', () => {
let Foo = AutoScroll(tComponent),
autoScroll = TestUtils.renderIntoDocument(<Foo></Foo>),
viewport = ReactDOM.findDOMNode(autoScroll)
viewport.scrollTop = 10
Object.defineProperty(viewport, "scrollHeight", { value: 10, writable: true })
autoScroll.componentWillUpdate()
expect(mockFn).toBeCalledWith("foo")
Object.defineProperty(viewport, "scrollHeight", { value: 0, writable: true })
autoScroll.componentDidUpdate()
expect(mockFn).toBeCalledWith("bar")
})
})
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