/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

2 votes126 views2 answers
React native scrollview detect end
Javascript React
0 vote128 views1 answer
React createElement interactive button
Javascript React
0 vote126 views1 answer
React locomotive-scroll
Javascript React
0 vote127 views1 answer
Make a component update every second react
Javascript React
3 votes127 views3 answers
Multiple styles in react native
Javascript React
5 votes164 views1 answer
React native break line text if too big
Javascript React
11 votes135 views2 answers
How to refresh the page using react
Javascript React
1 vote126 views1 answer
React native run release
Javascript React
0 vote124 views1 answer
How to link to a different component in reactjs without react router
Javascript React
0 vote82 views1 answer
React native cross out letter
Javascript React