Cannot access window properties when running tests with Jest

Question

I'm trying to access a property that is located under window.sunpietro.config property. When running tests with Jest I'm getting TypeError: Cannot read property 'config' of undefined.

My test code looks like the following:

import React from 'react';
import { render, cleanup } from 'react-testing-library';
import MyModule from '../my.module';
import { myConfigMock } from '../../../../jest.window.mock';

afterEach(cleanup);
beforeEach(() => {
    window.sunpietro = { ...myConfigMock };

    // window.sunpietro.config = {};
});

describe('MyModule', () => {
    test('The module renders correctly', () => {
        const { getByTestId } = render(<MyModule />);

        getByTestId('my-tabs').toBeDefined();
        getByTestId('my-panels').toBeDefined();
    });
});

I'm using the latest version of Jest: 24.7.1 and the react-testing-library version: 6.1.2.

How can I mock the window properties so they're accessible by MyModule instance?

Ange · Accepted Answer · 2019-04-17 09:38:33Z

6

You could set global variables in your setup. I have this setupFiles declared in my package.json

"jest": {
"setupFiles": [
  "<rootDir>/tests/shim.js",
  ...
],

Then in my shim.js. I am declaring window properties as global like

global.sunpietro : {
 ...
}

answered Apr 17, 2019 at 9:38

Ange

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