What is it?

Mocks for chrome.* extensions api via sinon stubs.

Why this is needed?

To run unit tests for chrome extensions in node or browser

Features

1. Stubs for all chrome.* methods and properties
2. Manual events triggering
3. Plugins to emulate cookies storage, opened tabs, etc

How to install

Npm:

npm install sinon-chrome

Direct download:
sinon-chrome.js

How to use

Make chrome global

Node

before(function() {
   global.chrome = require('sinon-chrome');
});

Browser

<script src="...sinon-chrome.js">

Write tests

You can use all sinon stub api to create chrome methods behavior.

For example

var domainACookies = [
   {
      name: 'a',
      value: 'b',
      domain: 'domainA.com'
   }
];

var domainBCookies = [
   {
      name: 'b',
      value: 'c',
      domain: 'domainB.com'
   }
];

var allCookies = domainACookies.concat(domainBCookies);

before(function () {
   chrome.cookies.getAll.withArgs({domain: 'domainA.com'}).yields(domainACookies);
   chrome.cookies.getAll.withArgs({domain: 'domainB.com'}).yields(domainBCookies);
   chrome.cookies.getAll.withArgs({}).yields(allCookies);
});

it('should return correct cookies for domain A', function () {
   chrome.cookies.getAll({domain: 'domainA.com'}, function (list) {
      assert.deepEqual(list, domainACookies);
   });
});

it('should return correct cookies for domain B', function () {
   chrome.cookies.getAll({domain: 'domainB.com'}, function (list) {
      assert.deepEqual(list, domainBCookies);
   });
});

it('should return correct cookies for all domains', function () {
   chrome.cookies.getAll({}, function (list) {
      assert.deepEqual(list, allCookies);
   });
});

Properties

You can define chrome api property values.

For example

chrome.runtime.id = 'test';
chrome.runtime.lastError = new Error('some error');
chrome.windows.WINDOW_ID_CURRENT = 100;

console.log(chrome.runtime.id); // test
console.log(chrome.runtime.lastError); // Error: some error(…)
console.log(chrome.windows.WINDOW_ID_CURRENT); // 100

chrome.flush();

console.log(chrome.runtime.id); // undefined
console.log(chrome.runtime.lastError); // undefined
console.log(chrome.windows.WINDOW_ID_CURRENT); // undefined

Events

You can can manipulate by chrome events by manual triggering with custom params.

For example

var handler = sinon.spy();
chrome.cookies.onChanged.addListener(handler);

chrome.cookies.onChanged.trigger(1, 2, 3);
handler.withArgs(1, 2, 3).callCount; // 1

chrome.cookies.onChanged.trigger(1, 2, 3);
handler.withArgs(1, 2, 3).callCount; // 2

// remove listener
chrome.cookies.onChanged.removeListener(handler);
chrome.cookies.onChanged.trigger(1, 2, 3);
chrome.cookies.onChanged.trigger(1, 2, 3);
handler.withArgs(1, 2, 3).callCount; // 2

To reset stubs data, you should call chrome.reset.

For example

chrome.tabs.getAll();
chrome.tabs.getAll();

chrome.runtime.id = 'test_id';

console.log(chrome.tabs.getAll.callCount); // 2

chrome.reset();
console.log(chrome.tabs.getAll.callCount); // 0

To reset stubs behavior, you should call chrome.flush or chrome.[namespace].[method].resetBehavior

For example

chrome.runtime.getURL.returns('url');
chrome.tabs.query.yields([1, 2, 3]);
console.log(chrome.runtime.getURL()); // url
chrome.tabs.query({}, function tabsHandler(list) {
   console.log(list); // [1, 2, 3]
});

chrome.flush();
console.log(chrome.runtime.getURL()); // undefined
chrome.tabs.query({}, function tabsHandler(list) {
   // unreachable point. Function tabsHandler will never be called
});

Difference from 0.2 version

We remove all predefined properties and behavior. You must define all stubs behavior by your self.

For example

before(function () {
   chrome.runtime.id = 'my_test_id';
   chrome.runtime.getURL = function (path) {
      return 'chrome-extension://' + chrome.runtime.id + '/' + path;
   };
});

Supported namespaces

1. chrome.alarms
2. chrome.bookmarks
3. chrome.browserAction
4. chrome.browsingData
5. chrome.certificateProvider
6. chrome.commands
7. chrome.contentSettings
8. chrome.contextMenus
9. chrome.cookies
10. chrome.debugger
11. chrome.declarativeContent
12. chrome.desktopCapture
13. chrome.devtools.inspectedWindow
14. chrome.devtools.network
15. chrome.devtools.panels
16. chrome.downloads
17. chrome.extension
18. chrome.extensionTypes
19. chrome.fontSettings
20. chrome.gcm
21. chrome.history
22. chrome.i18n
23. chrome.identity
24. chrome.idle
25. chrome.instanceID
26. chrome.management
27. chrome.notifications
28. chrome.omnibox
29. chrome.pageAction
30. chrome.pageCapture
31. chrome.permissions
32. chrome.printerProvider
33. chrome.privacy
34. chrome.proxy
35. chrome.runtime
36. chrome.sessions
37. chrome.storage
38. chrome.system.cpu
39. chrome.system.display
40. chrome.system.memory
41. chrome.system.storage
42. chrome.tabCapture
43. chrome.tabs
44. chrome.topSites
45. chrome.tts
46. chrome.ttsEngine
47. chrome.webNavigation
48. chrome.webRequest
49. chrome.windows

Development and pull request.

Fork this repo and install all dependencies. Don't forget check your code style and run tests before send pull request.

code checking

npm run code

run tests

npm test

Any questions?

Feel free to open issue.

Contributors

1. Vitaly Potapov
2. Aleksey Tsvetkov