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showing results for - "how to test useeffect in react testing library"
Hallie
17 Jan 2019
1import { List } from './';
2import React from 'react';
3import '@testing-library/jest-dom/extend-expect';
4import { render, waitForElement } from '@testing-library/react';
5
6describe('59892259', () => {
7  let originFetch;
8  beforeEach(() => {
9    originFetch = (global as any).fetch;
10  });
11  afterEach(() => {
12    (global as any).fetch = originFetch;
13  });
14  it('should pass', async () => {
15    const fakeResponse = { title: 'example text' };
16    const mRes = { json: jest.fn().mockResolvedValueOnce(fakeResponse) };
17    const mockedFetch = jest.fn().mockResolvedValueOnce(mRes as any);
18    (global as any).fetch = mockedFetch;
19    const { getByTestId } = render(<List></List>);
20    const div = await waitForElement(() => getByTestId('test'));
21    expect(div).toHaveTextContent('example text');
22    expect(mockedFetch).toBeCalledTimes(1);
23    expect(mRes.json).toBeCalledTimes(1);
24  });
25});
26
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