ReactPureComponent-test.js — react Source File

Source Code

/**
 * Copyright (c) Meta Platforms, Inc. and 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 act;
let assertConsoleErrorDev;
let React;
let ReactDOMClient;

describe('ReactPureComponent', () => {
  beforeEach(() => {
    ({act, assertConsoleErrorDev} = require('internal-test-utils'));

    React = require('react');
    ReactDOMClient = require('react-dom/client');
  });

  it('should render', async () => {
    let renders = 0;
    class Component extends React.PureComponent {
      constructor() {
        super();
        this.state = {type: 'mushrooms'};
      }
      render() {
        renders++;
        return <div>{this.props.text[0]}</div>;
      }
    }

    const container = document.createElement('div');
    const root = ReactDOMClient.createRoot(container);
    let text;
    const componentRef = React.createRef();

    text = ['porcini'];
    await act(() => {
      root.render(<Component ref={componentRef} text={text} />);
    });
    expect(container.textContent).toBe('porcini');
    expect(renders).toBe(1);

    text = ['morel'];
    await act(() => {
      root.render(<Component ref={componentRef} text={text} />);
    });
    expect(container.textContent).toBe('morel');
    expect(renders).toBe(2);

    text[0] = 'portobello';
    await act(() => {
      root.render(<Component ref={componentRef} text={text} />);
    });
// ... (86 more lines)