ReactIncrementalReflection-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
 * @jest-environment node
 */

'use strict';

let React;
let ReactNoop;
let Scheduler;
let waitFor;
let waitForAll;

describe('ReactIncrementalReflection', () => {
  beforeEach(() => {
    jest.resetModules();

    React = require('react');
    ReactNoop = require('react-noop-renderer');
    Scheduler = require('scheduler');

    const InternalTestUtils = require('internal-test-utils');
    waitFor = InternalTestUtils.waitFor;
    waitForAll = InternalTestUtils.waitForAll;
  });

  function div(...children) {
    children = children.map(c =>
      typeof c === 'string' ? {text: c, hidden: false} : c,
    );
    return {type: 'div', children, prop: undefined, hidden: false};
  }

  function span(prop) {
    return {type: 'span', children: [], prop, hidden: false};
  }

  it('finds no node before insertion and correct node before deletion', async () => {
    let classInstance = null;

    function findInstance(inst) {
      // We ignore warnings fired by findInstance because we are testing
      // that the actual behavior still works as expected even though it
      // is deprecated.
      const oldConsoleError = console.error;
      console.error = jest.fn();
      try {
        return ReactNoop.findInstance(inst);
      } finally {
        console.error = oldConsoleError;
      }
    }

    class Component extends React.Component {
      UNSAFE_componentWillMount() {
// ... (124 more lines)