componentStacks-test.js

/**
 * 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.
 *
 * @flow
 */

import {getVersionedRenderImplementation, normalizeCodeLocInfo} from './utils';

describe('component stack', () => {
  let React;
  let act;
  let mockError;
  let mockWarn;

  beforeEach(() => {
    // Intercept native console methods before DevTools bootstraps.
    // Normalize component stack locations.
    mockError = jest.fn();
    mockWarn = jest.fn();
    console.error = (...args) => {
      mockError(...args.map(normalizeCodeLocInfo));
    };
    console.warn = (...args) => {
      mockWarn(...args.map(normalizeCodeLocInfo));
    };

    const utils = require('./utils');
    act = utils.act;

    React = require('react');
  });

  const {render} = getVersionedRenderImplementation();

  // @reactVersion >=16.9
  it('should log the current component stack along with an error or warning', () => {
    const Grandparent = () => <Parent />;
    const Parent = () => <Child />;
    const Child = () => {
      console.error('Test error.');
      console.warn('Test warning.');
      return null;
    };

    act(() => render(<Grandparent />));

    expect(mockError).toHaveBeenCalledWith(
      'Test error.',
      '\n    in Child (at **)' +
        '\n    in Parent (at **)' +
        '\n    in Grandparent (at **)',
    );
    expect(mockWarn).toHaveBeenCalledWith(
      'Test warning.',
      '\n    in Child (at **)' +
        '\n    in Parent (at **)' +
        '\n    in Grandparent (at **)',
    );
  });

  // This test should have caught #19911
  // but didn't because both DevTools and ReactDOM are running in the same memory space,
  // so the case we're testing against (DevTools prod build and React DEV build) doesn't exist.
  // It would be nice to figure out a way to test this combination at some point...
  xit('should disable the current dispatcher before shallow rendering so no effects get scheduled', () => {
    let useEffectCount = 0;

    const Example = props => {
      React.useEffect(() => {
        useEffectCount++;
        expect(props).toBeDefined();
      }, [props]);
      console.warn('Warning to trigger appended component stacks.');
      return null;
    };

    act(() => render(<Example test="abc" />));

    expect(useEffectCount).toBe(1);

    expect(mockWarn).toHaveBeenCalledWith(
      'Warning to trigger appended component stacks.',
      '\n    in Example (at **)',
    );
  });
});