Question

在这里，我想改变状态并测试它。我有

App.js 按顺序包含 3 个钩子：

 const [searchResult, setSearchResult] = useState([]);
 const [searched, setSearched] = useState('');
 const [appsAlert, setAppsAlert] = useState({
   success: { status: false, msg: '' },
   error: { status: false, msg: '' },
 });

在 utils.test.js 中

export const setHookState = (newState) =>
  jest.fn().mockImplementation((state) => [newState, () => {}]);

在 App.test.js 中

import * as React from 'react';
import { mount } from 'enzyme';
import App from '../app';
import { setHookState } from '../../utils/test';

describe('Application Page Test Cases', () => {
  beforeAll(() => {});

  afterEach(() => {
    jest.clearAllMocks();
  });
  test('Test Case 1', () => {
    const reactMock = require('react');

    reactMock.useState = setHookState({
      searchResult: [],
      searched: 'xyz',
      appsAlert: {
        success: { status: false, msg: 'Successful' },
        error: { status: true, msg: 'Error Received' },
      },
    });

    const wrapper = mount(<App />);
    const searchBox = wrapper.find("[testId='AppListingSearchText']");
    expect(searchBox.props().searched).toBe('xyz');     

  });

  test('Test Case 2', () => {
    const stateSetter = jest.fn();

    jest
      .spyOn(React, 'useState')
      .mockImplementation((searched) => ['xyz', stateSetter]);

    jest.spyOn(React, 'useState').mockImplementation((appsAlert) => [
      {
        success: { status: false, msg: '' },
        error: { status: true, msg: 'Error Received' },
      },
      stateSetter,
    ]);

    const wrapper = mount(<App />);

    const searchBox = wrapper.find("[testId='AppListingSearchText']");
    expect(searchBox.props().searched).toBe('xyz');
  });

});

在这两个测试用例中，我希望搜索状态的值为“xyz”，但它显示以下错误：应用程序页面测试用例 › 测试用例 1

TypeError: _react.default.useState is not a function

  22 |     });
  23 |
> 24 |     const wrapper = mount(<App />);
     |                     ^
  25 |     expect(wrapper.props().searched).toBe('xyz');

我想测试状态更改为“xyz”的组件

我无法通过单元测试获得钩子状态。我不想用 onClick 事件更新状态

0 个答案: