/
ReactDOMHooks-test.js
142 lines (113 loc) · 3.75 KB
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ReactDOMHooks-test.js
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @emails react-core
*/
'use strict';
let React;
let ReactDOM;
let Scheduler;
describe('ReactDOMHooks', () => {
let container;
beforeEach(() => {
jest.resetModules();
React = require('react');
ReactDOM = require('react-dom');
Scheduler = require('scheduler');
container = document.createElement('div');
document.body.appendChild(container);
});
afterEach(() => {
document.body.removeChild(container);
});
it('can ReactDOM.render() from useEffect', () => {
let container2 = document.createElement('div');
let container3 = document.createElement('div');
function Example1({n}) {
React.useEffect(() => {
ReactDOM.render(<Example2 n={n} />, container2);
});
return 1 * n;
}
function Example2({n}) {
React.useEffect(() => {
ReactDOM.render(<Example3 n={n} />, container3);
});
return 2 * n;
}
function Example3({n}) {
return 3 * n;
}
ReactDOM.render(<Example1 n={1} />, container);
expect(container.textContent).toBe('1');
expect(container2.textContent).toBe('');
expect(container3.textContent).toBe('');
Scheduler.unstable_flushAll();
expect(container.textContent).toBe('1');
expect(container2.textContent).toBe('2');
expect(container3.textContent).toBe('3');
ReactDOM.render(<Example1 n={2} />, container);
expect(container.textContent).toBe('2');
expect(container2.textContent).toBe('2'); // Not flushed yet
expect(container3.textContent).toBe('3'); // Not flushed yet
Scheduler.unstable_flushAll();
expect(container.textContent).toBe('2');
expect(container2.textContent).toBe('4');
expect(container3.textContent).toBe('6');
});
it('should not bail out when an update is scheduled from within an event handler', () => {
const {createRef, useCallback, useState} = React;
const Example = ({inputRef, labelRef}) => {
const [text, setText] = useState('');
const handleInput = useCallback(event => {
setText(event.target.value);
});
return (
<React.Fragment>
<input ref={inputRef} onInput={handleInput} />
<label ref={labelRef}>{text}</label>
</React.Fragment>
);
};
const inputRef = createRef();
const labelRef = createRef();
ReactDOM.render(
<Example inputRef={inputRef} labelRef={labelRef} />,
container,
);
inputRef.current.value = 'abc';
inputRef.current.dispatchEvent(
new Event('input', {bubbles: true, cancelable: true}),
);
expect(labelRef.current.innerHTML).toBe('abc');
});
it('should not bail out when an update is scheduled from within an event handler in Concurrent Mode', () => {
const {createRef, useCallback, useState} = React;
const Example = ({inputRef, labelRef}) => {
const [text, setText] = useState('');
const handleInput = useCallback(event => {
setText(event.target.value);
});
return (
<React.Fragment>
<input ref={inputRef} onInput={handleInput} />
<label ref={labelRef}>{text}</label>
</React.Fragment>
);
};
const inputRef = createRef();
const labelRef = createRef();
const root = ReactDOM.unstable_createRoot(container);
root.render(<Example inputRef={inputRef} labelRef={labelRef} />);
Scheduler.unstable_flushAll();
inputRef.current.value = 'abc';
inputRef.current.dispatchEvent(
new Event('input', {bubbles: true, cancelable: true}),
);
Scheduler.unstable_flushAll();
expect(labelRef.current.innerHTML).toBe('abc');
});
});