/Javascript/React/How to test useEffect in react testing library

How to test useEffect in react testing library

import { List } from './';
import React from 'react';
import '@testing-library/jest-dom/extend-expect';
import { render, waitForElement } from '@testing-library/react';

describe('59892259', () => {
  let originFetch;
  beforeEach(() => {
    originFetch = (global as any).fetch;
  });
  afterEach(() => {
    (global as any).fetch = originFetch;
  });
  it('should pass', async () => {
    const fakeResponse = { title: 'example text' };
    const mRes = { json: jest.fn().mockResolvedValueOnce(fakeResponse) };
    const mockedFetch = jest.fn().mockResolvedValueOnce(mRes as any);
    (global as any).fetch = mockedFetch;
    const { getByTestId } = render(<List></List>);
    const div = await waitForElement(() => getByTestId('test'));
    expect(div).toHaveTextContent('example text');
    expect(mockedFetch).toBeCalledTimes(1);
    expect(mRes.json).toBeCalledTimes(1);
  });
});

Source: stackoverflow.com

Similar codes

0 vote156 views1 answer
React type div onClick
Javascript React
13 votes152 views4 answers
React deep copy
Javascript React
18 votes171 views2 answers
Store data in localstorage react
Javascript React
9 votes195 views2 answers
Html emmet in react vscode
Javascript React
45 votes166 views4 answers
Can't resolve 'react-router-dom'
Javascript React
0 vote154 views1 answer
Restful react npm
Javascript React
0 vote158 views1 answer
Unrecognized font family fontawesome react native ios
Javascript React
2 votes110 views6 answers
React font-awesome
Javascript React
0 vote148 views1 answer
Onpress not working with usestate react native
Javascript React
0 vote112 views3 answers
Flash effect in react native
Javascript React