Nuclear Powered Marshmallows
Unleash awesomeness. Private packages, team management tools, and powerful integrations. Get started with npm Orgs »


15.1.0 • Public • Published

CKEditor 5 testing environment

Testing environment for CKEditor 5. It's based on Karma and webpack and it's normally used in the CKEditor 5 development environment. Read more about CKEditor 5's testing environment.

More information about development tools packages can be found at the following URL:


First, you need to install the package:

npm i --save-dev @ckeditor/ckeditor5-dev-tests

An example npm task to test CKEditor 5 packages (used e.g. in can look like this:

  "scripts": {
      "test": "node ./node_modules/.bin/ckeditor5-dev-tests",
      "manual": "node ./node_modules/.bin/ckeditor5-dev-tests-manual"

If you encounter problems with big test folders pass --max_old_space_size=4096 option to node runner:

  "scripts": {
      "test": "node --max_old_space_size=4096 ./node_modules/.bin/ckeditor5-dev-tests"

You can also use the bin script for testing a package:

# For running all the tests (for the current package and all dependencies). 
./node_modules/.bin/ckeditor5-dev-tests --files=*
# For running tests in the current package. 

CLI options

  • watch - Whether to watch the files and executing tests whenever any file changes. Also available as an alias: -w.
  • source-map - Whether to generate the source maps. Also available as an alias: -s.
  • coverage - Whether to generate code coverage. Also available as an alias: -c.
  • verbose - Whether to informs about Webpack's work. Also available as an alias: -v.
  • files - Specify file(s) to test. Also available as an alias: -f.
  • browsers - Browsers which will be used to run the tests. Also available as an alias: -b.
  • reporter - Mocha reporter – either mocha (default) or dots (less verbose one).


You can use BrowserStack to execute the tests on different browsers. At this moment we have defined 2 browsers:

  1. Edge 16 - Windows 10 (BrowserStack_Edge)
  2. Safari 11 - OS X High Sierra (BrowserStack_Safari)

In order to run BrowserStack, you need to specify the environment variables: BROWSER_STACK_USERNAME and BROWSER_STACK_ACCESS_KEY. By default, the tests will be executed on Chrome that is installed on your machine. You can use an option --browsers to specify the browsers.


Test the ckeditor5-enter and ckeditor5-paragraph packages and generate code coverage report:

$ npm t -- -c --files=enter,paragraph

Run tests/view/**/*.js tests from ckeditor5-engine and rerun them once any file change (the watch mode):

$ npm t -- -w --files=engine/view

Test specified files in ckeditor5-basic-styles on two browsers (Chrome and Firefox) you can use:

$ npm t -- --browsers=chrome,firefox --files=basic-styles/boldengine.js,basic-styles/italicengine.js

Test all installed packages:

$ npm t -- --files=*

Test all installed packages except one (or more):

$ npm t -- --files='!(engine)'
$ npm t -- --files='!(engine|ui)'

Test the ckeditor5-engine using BrowserStack on Edge:

$ BROWSER_STACK_USERNAME=[...] BROWSER_STACK_ACCESS_KEY=[...] npm test -- --files engine --browsers=BrowserStack_Edge

Test the ckeditor5-image and ckeditor5-ui using BrowserStack on Safari and Edge:

$ BROWSER_STACK_USERNAME=[...] BROWSER_STACK_ACCESS_KEY=[...] npm test -- --files image,ui --browsers=BrowserStack_Safari,BrowserStack_Edge

Rules for converting --files option to glob pattern:

--file Glob Description
engine node_modules/ckeditor5-engine/tests/**/*.js
engine/view node_modules/ckeditor5-engine/tests/view/**/*.js
engine/view/so/**/me/glob.js node_modules/ckeditor5-engine/tests/view/so/**/me/*glob.js
!(engine) node_modules/ckeditor5-!(engine)*/tests/**/*.js all tests except of given package(s) – works with multiple names !(engine|ui|utils)
* node_modules/ckeditor5-*/tests/**/*.js all installed package's tests
/ tests/**/*.js current package's tests only


See the file.


Licensed under the terms of GNU General Public License Version 2 or later. For full details about the license, please check the file.




npm i @ckeditor/ckeditor5-dev-tests

Downloadsweekly downloads









last publish


  • avatar
Report a vulnerability