ReactPerformanceTrack-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
 */

let React;
let ReactNoop;
let Scheduler;
let act;
let useEffect;

describe('ReactPerformanceTracks', () => {
  const performanceMeasureCalls = [];

  beforeEach(() => {
    performanceMeasureCalls.length = 0;
    Object.defineProperty(performance, 'measure', {
      value: jest.fn((measureName, reusableOptions) => {
        performanceMeasureCalls.push([
          measureName,
          {
            // React will mutate the options it passes to performance.measure.
            ...reusableOptions,
          },
        ]);
      }),
      configurable: true,
    });
    console.timeStamp = () => {};
    jest.spyOn(console, 'timeStamp').mockImplementation(() => {});

    jest.resetModules();

    React = require('react');
    ReactNoop = require('react-noop-renderer');
    Scheduler = require('scheduler');
    act = require('internal-test-utils').act;
    useEffect = React.useEffect;
  });

  function getConsoleTimestampEntries() {
    try {
      return console.timeStamp.mock.calls.filter(call => {
        const [, startTime, endTime] = call;

        const isRegisterTrackCall = startTime !== 0.003 && endTime !== 0.003;
        return isRegisterTrackCall;
      });
    } finally {
      console.timeStamp.mockClear();
    }
  }

  // @gate __DEV__ && enableComponentPerformanceTrack
  it('shows a hint if an update is triggered by a deeply equal object', async () => {
// ... (573 more lines)