jest-webextension-mock

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Install

For yarn:

yarn add --dev jest-webextension-mock

For npm:

npm i --save-dev jest-webextension-mock

Setup

Require module directly

In your package.json under the jest section add the setupFiles attribute with this module name.

"jest": {
  "setupFiles": [
    "jest-webextension-mock"
  ]
}

Use setup file

Alternatively you can create a new setup file and require this module.

__setups__/chrome.js

global.chrome = require('jest-webextension-mock');

And add that file to your setupFiles:

"jest": {
  "setupFiles": [
    "./__setups__/chrome.js"
  ]
}

Usage

With this module setup in Jest you can start relying on it in your tests.

describe('your function to test', () => {
  it('should have called a webextension API', () => {
    yourFunctionToTest();
    expect(chrome.tabs.update).toHaveBeenCalled();
  });
});

Check the API was called with certain parameters.

describe('your function to test', () => {
  it('should have called a webextension API', () => {
    yourFunctionToTest();
    expect(chrome.tabs.update).toHaveBeenCalledWith({
      url: 'https://example.com/'
    });
  });
});

Development

yarn install
yarn test

Pull Request

Before every PR run the following:

yarn run prettier

Publish

When publishing a new build, run the following:

yarn run prettier
yarn run build
yarn publish