What is karma-chrome-launcher?
The karma-chrome-launcher npm package is a plugin for Karma, a test runner for JavaScript. It allows developers to execute tests in the Chrome browser. It can launch Chrome in various modes, control browser instances, and integrate with continuous integration systems.
What are karma-chrome-launcher's main functionalities?
Launching Chrome for testing
This feature allows you to configure Karma to use Chrome as the browser for running tests. You simply add 'Chrome' to the 'browsers' array in your Karma configuration.
module.exports = function(config) {
config.set({
browsers: ['Chrome'],
// ... other Karma configuration ...
});
};
Running tests in headless Chrome
This feature enables you to run tests in a headless Chrome instance, which is useful for continuous integration environments where you don't need a visible UI.
module.exports = function(config) {
config.set({
browsers: ['ChromeHeadless'],
// ... other Karma configuration ...
});
};
Customizing Chrome flags
This feature allows you to customize the Chrome instance by adding command-line flags to alter its behavior for testing purposes.
module.exports = function(config) {
config.set({
customLaunchers: {
Chrome_with_flags: {
base: 'Chrome',
flags: ['--disable-web-security', '--disable-gpu']
}
},
browsers: ['Chrome_with_flags'],
// ... other Karma configuration ...
});
};
Other packages similar to karma-chrome-launcher
karma-firefox-launcher
This package is similar to karma-chrome-launcher but is used to launch Mozilla Firefox for running tests with Karma. It provides similar functionality for a different browser.
karma-safari-launcher
Similar to karma-chrome-launcher, this package allows you to run tests in the Safari browser. It is specifically tailored for Safari and provides comparable features for Karma integration.
karma-ie-launcher
This package is designed to launch Internet Explorer for testing with Karma. It offers similar capabilities to karma-chrome-launcher but targets the Internet Explorer browser.
karma-edge-launcher
karma-edge-launcher is a plugin to launch Microsoft Edge for testing with Karma. It provides similar features to karma-chrome-launcher, adapted for the Edge browser.
karma-chrome-launcher
Launcher for Google Chrome and Google Chrome Canary.
Installation
The easiest way is to keep karma-chrome-launcher
as a devDependency in your package.json
.
{
"devDependencies": {
"karma": "~0.10",
"karma-chrome-launcher": "~0.1"
}
}
You can simple do it by:
npm install karma-chrome-launcher --save-dev
Configuration
module.exports = function(config) {
config.set({
browsers: ['Chrome', 'Chrome_without_security'],
customLaunchers: {
Chrome_without_security: {
base: 'Chrome',
flags: ['--disable-web-security']
}
}
});
};
You can pass list of browsers as a CLI argument too:
karma start --browsers Chrome,Chrome_without_security
For more information on Karma see the homepage.