I have written this component. it fetchs data using hooks and state. Once it is fetched the loading state is changed to false and show the sidebar.
I faced a problem with Jest and Enzyme, as it does throw a warning for Act in my unit test. once I add the act to my jest and enzyme the test is failed!
And, I have added a test like this which works perfectly.
import React from 'react';
import { mount } from 'enzyme';
import fetchData from '../apiWrappers/fetchData';
import data from '../data/data.json';
import App from './App';
jest.mock('../apiWrappers/fetchData');
const getData = Promise.resolve(data);
fetchData.mockReturnValue(getData);
describe('<App/> Rendering using enzyme', () => {
beforeEach(() => {
fetchData.mockClear();
});
test('After loading', async () => {
const wrapper = mount(<App />);
expect(wrapper.find('span').at(0).text()).toEqual('Loading List');
const d = await fetchData();
expect(d).toHaveLength(data.length);
wrapper.update();
expect(wrapper.find('span').exists()).toEqual(false);
expect(wrapper.html()).toMatchSnapshot();
});
});
So, I got a warning:
Warning: An update to App inside a test was not wrapped in act(...).
When testing, code that causes React state updates should be wrapped into act(...):
act(() => {
/* fire events that update state */
});
I did resolve the warning like this using { act } react-dom/test-utils.
import React from 'react';
import { act } from 'react-dom/test-utils';
import { mount } from 'enzyme';
import fetchData from '../apiWrappers/fetchData';
import data from '../data/data.json';
import App from './App';
jest.mock('../apiWrappers/fetchData');
const getData = Promise.resolve(data);
fetchData.mockReturnValue(getData);
describe('<App/> Rendering using enzyme', () => {
beforeEach(() => {
fetchData.mockClear();
});
test('After loading', async () => {
await act(async () => {
const wrapper = mount(<App />);
expect(wrapper.find('span').at(0).text()).toEqual('Loading List');
const d = await fetchData();
expect(d).toHaveLength(data.length);
wrapper.update();
expect(wrapper.find('span').exists()).toEqual(false);
expect(wrapper.html()).toMatchSnapshot();
});
});
});
But, then my test is failed.
<App/> Rendering using enzyme › After loading
expect(received).toEqual(expected) // deep equality
Expected: false
Received: true
35 |
36 | wrapper.update();
> 37 | expect(wrapper.find('span').exists()).toEqual(false);
Does anybody know why it fails? Thanks!
"react": "16.13.1",
"enzyme": "^3.11.0",
"enzyme-adapter-react-16": "^1.15.3",
This issue is not new at all. You can read the full discussion here: https://github.com/enzymejs/enzyme/issues/2073.
To sum up, currently in order to fix act
warning, you have to wait a bit before update your wrapper as following:
const waitForComponentToPaint = async (wrapper) => {
await act(async () => {
await new Promise(resolve => setTimeout(resolve));
wrapper.update();
});
};
test('After loading', async () => {
const wrapper = mount(<App />);
expect(wrapper.find('span').at(0).text()).toEqual('Loading List');
// before the state updated
await waitForComponentToPaint(wrapper);
// after the state updated
expect(wrapper.find('span').exists()).toEqual(false);
expect(wrapper.html()).toMatchSnapshot();
});