ReactError-test.internal.js

/**
 * 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;

describe('ReactError', () => {
  let globalErrorMock;

  beforeEach(() => {
    if (!__DEV__) {
      // In production, our Jest environment overrides the global Error
      // class in order to decode error messages automatically. However
      // this is a single test where we actually *don't* want to decode
      // them. So we assert that the OriginalError exists, and temporarily
      // set the global Error object back to it.
      globalErrorMock = global.Error;
      global.Error = globalErrorMock.OriginalError;
      expect(typeof global.Error).toBe('function');
    }
    jest.resetModules();
    React = require('react');
    ReactDOM = require('react-dom');
  });

  afterEach(() => {
    if (!__DEV__) {
      global.Error = globalErrorMock;
    }
  });

  // @gate build === "production"
  it('should error with minified error code', () => {
    expect(() => ReactDOM.render('Hi', null)).toThrowError(
      'Minified React error #200; visit ' +
        'https://reactjs.org/docs/error-decoder.html?invariant=200' +
        ' for the full message or use the non-minified dev environment' +
        ' for full errors and additional helpful warnings.',
    );
  });

  it('should serialize arguments', () => {
    function Oops() {
      return;
    }
    Oops.displayName = '#wtf';
    const container = document.createElement('div');
    expect(() => ReactDOM.render(<Oops />, container)).not.toThrowError();
  });
});