测试自定义挂钩:不变违规:找不到 react-redux 上下文值;请确保组件包裹在 <Provider>

Testing custom hook: Invariant Violation: could not find react-redux context value; please ensure the component is wrapped in a <Provider>

我有一个要测试的自定义挂钩。它接收一个 redux store dispatch 函数和 returns 一个函数。为了得到我正在尝试做的结果:

const { result } = renderHook(() => { useSaveAuthenticationDataToStorages(useDispatch())});

但是,我得到一个错误:

Invariant Violation: could not find react-redux context value; please ensure the component is wrapped in a

这是因为 useDispatch 并且没有连接商店。但是,我这里没有任何组件可以用提供程序包装。我只需要测试将数据简单地保存到商店的挂钩。

我该如何解决?

react hooks 测试库 docs 对此进行了更深入的研究。然而,我们本质上缺少的是我们可以通过创建包装器获得的提供者。首先我们声明一个组件,它将成为我们的提供者:

import { Provider } from 'react-redux'

const ReduxProvider = ({ children, reduxStore }) => (
  <Provider store={reduxStore}>{children}</Provider>
)

然后在我们的测试中调用

test("...", () => {
  const store = configureStore();
  const wrapper = ({ children }) => (
    <ReduxProvider reduxStore={store}>{children}</ReduxProvider>
  );
  const { result } = renderHook(() => {
    useSaveAuthenticationDataToStorages(useDispatch());
  }, { wrapper });
  // ... Rest of the logic
});

这可能是一个迟到的答案,但您也可以在测试中使用它

jest.mock('react-redux', () => {
    const ActualReactRedux = jest.requireActual('react-redux');
    return {
        ...ActualReactRedux,
        useSelector: jest.fn().mockImplementation(() => {
            return mockState;
        }),
    };
});

此问题与您的测试文件有关。您必须在测试文件中声明 providerstore

用下面的代码

更新或替换你的app.test.tsx

注意:如果您还没有安装 redux-mock-store,请不要忘记安装。

import React from 'react';
import { render } from '@testing-library/react';

import App from './App';

import { Provider } from 'react-redux';
import configureStore from 'redux-mock-store';

describe('With React Testing Library', () => {
    const initialState = { output: 10 };
    const mockStore = configureStore();
    let store;

    it('Shows "Hello world!"', () => {
        store = mockStore(initialState);
        const { getByText } = render(
            <Provider store={store}>
                <App />
            </Provider>
        );

        expect(getByText('Hello World!')).not.toBeNull();
    });
});

我搜索了 1 小时后得到了这个解决方案。 非常感谢 OSTE

原解:Github issues/8145 and solution link


使用此解决方案,如果出现 TypeError: window.matchMedia is not a function 之类的错误,请按此方式解决。将这些行添加到您的 setupTests.ts 文件中。原解link

global.matchMedia = global.matchMedia || function () {
  return {
    addListener: jest.fn(),
    removeListener: jest.fn(),
  };
};

我认为您可以像这样创建 test-utils.[j|t]s(?x)whatever you set the name of the file to

https://github.com/hafidzamr/nextjs-ts-redux-toolkit-quickstart/blob/main/__tests__/test-utils.tsx

//root(or wherever your the file)/test-utils.tsx

import React from 'react';
import { render, RenderOptions } from '@testing-library/react';
import { Provider } from 'react-redux';

// Import your store
import { store } from '@/store';

const Wrapper: React.FC = ({ children }) => <Provider store={store}>{children}</Provider>;

const customRender = (ui: React.ReactElement, options?: Omit<RenderOptions, 'wrapper'>) => render(ui, { wrapper: Wrapper, ...options });

// re-export everything
export * from '@testing-library/react';
// override render method
export { customRender as render };


像这样使用它: https://github.com/hafidzamr/nextjs-ts-redux-toolkit-quickstart/blob/main/__tests__/pages/index.test.tsx

//__tests__/pages/index.test.tsx


import React from 'react';
import { render, screen } from '../test-utils';
import Home from '@/pages/index';

describe('Home Pages', () => {
  test('Should be render', () => {
    render(<Home />);
    const getAText = screen.getByTestId('welcome');
    expect(getAText).toBeInTheDocument();
  });
});


适合我。

screenshot work

顺便说一句,如果您将 test-utils.[j|t]s(?x)whatever you set the name file 位置放在目录 __test__ 上,请不要忘记在 jest.config.js.[=23= 上忽略它]

//jest.config.js

testPathIgnorePatterns: ['<rootDir>/node_modules/', '<rootDir>/.next/', '<rootDir>/__tests__/test-utils.tsx'],

回购:https://github.com/hafidzamr/nextjs-ts-redux-toolkit-quickstart