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import React from 'react';
import {mount} from 'enzyme';
import ThrottledPropertyHOC from '../../../src/lib/throttled-property-hoc.jsx';
describe('VMListenerHOC', () => {
let mounted;
const throttleTime = 500;
beforeEach(() => {
const Component = ({propToThrottle, doNotThrottle}) => (
<input
name={doNotThrottle}
value={propToThrottle}
/>
);
const WrappedComponent = ThrottledPropertyHOC('propToThrottle', throttleTime)(Component);
global.Date.now = () => 0;
mounted = mount(
<WrappedComponent
doNotThrottle="oldvalue"
propToThrottle={0}
/>
);
});
test('it passes the props on initial render ', () => {
expect(mounted.find('[value=0]').exists()).toEqual(true);
expect(mounted.find('[name="oldvalue"]').exists()).toEqual(true);
});
test('it does not rerender if throttled prop is updated too soon', () => {
global.Date.now = () => throttleTime / 2;
mounted.setProps({propToThrottle: 1});
mounted.update();
expect(mounted.find('[value=0]').exists()).toEqual(true);
});
test('it does rerender if throttled prop is updated after throttle timeout', () => {
global.Date.now = () => throttleTime * 2;
mounted.setProps({propToThrottle: 1});
mounted.update();
expect(mounted.find('[value=1]').exists()).toEqual(true);
});
test('it does rerender if a non-throttled prop is changed', () => {
global.Date.now = () => throttleTime / 2;
mounted.setProps({doNotThrottle: 'newvalue', propToThrottle: 2});
mounted.update();
expect(mounted.find('[name="newvalue"]').exists()).toEqual(true);
expect(mounted.find('[value=2]').exists()).toEqual(true);
});
});
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