@jsdevtools/karma-host-environment

Karma Host Environment
==============================




Host Environment is a library that makes it easy to detect whether your code is running in Node.js or a web browser, Windows or Mac, Internet Explorer or Chrome, etc.

Karma Host Environment is a companion to Host Environment, specifically for the Karma test runner. It allows you to detect not only the browser that your tests are running in, but also information about the host server, such as the operating system, Node.js version, and even environment variables.

Example
--------------------------

``javascript
import host from "@jsdevtools/host-environment";

if (host.ci) {
// Setup CI/CD test fixtures
}

if (host.browser) {
// Test browser behavior

if (host.browser.IE) {
// Test Internet Explorer-specific behavior
}
}

if (host.node) {
// Test Node.js behavior

if (host.node.version < 8) {
// Different logic for older versions of Node
}

if (host.os.windows) {
// Test Windows-specific behavior
}
}
`

Related Projects
--------------------------
- karma-config

Karma configuration builder with sensible defaults to minimize boilerplate

- host-environment

Easily detect what host environment your code is running in

Installation
--------------------------
Use npm or yarn to install @jsdevtools/host-environment and @jsdevtools/karma-host-environment as development dependencies:

`bash
npm install --save-dev @jsdevtools/host-environment @jsdevtools/karma-host-environment
`

Usage
--------------------------
Configure Karma to use the host-environment framework plug-in:

karma.conf.js

`javascript
module.exports = function(config) {
config.set({
frameworks: ["host-environment"],
...
});
};
`

API
--------------------------
Import host-environment as you normally would:

`javascript
import host from "@jsdevtools/host-environment";
`

$3


You can use all of the host properties as usual:

- host.global
- host.os
- host.env
- host.node
- host.browser

$3


Normally the host.env property would be an empty object when running in a web browser, since web browsers don't have access to environment variables. But Karma Host Environment exposes the host server's environment variables, so you can use host.env just as you would if you were running in Node.js:

`javascript
if (host.env.QUICK_TEST) {
// Skip long-running tests
}
`

$3


In addition to all the usual host properties, Karma Host Environment adds an additional host.karma property. This object exposes all the host properties of the Karma server itself, such as the operating system, Node.js version, environmenv variables, etc.

`javascript
if (host.karma) {
// We're running in Karma

if (host.karma.node.version > 10) {
// The server is running in Node v10+
}

if (host.karma.os.windows) {
// The server is a Windows OS
}
}
`


Contributing
--------------------------
Contributions, enhancements, and bug-fixes are welcome! Open an issue on GitHub and submit a pull request.

#### Building
To build the project locally on your computer:

1. __Clone this repo__

git clone https://github.com/JS-DevTools/karma-host-environment.git

2. __Install dependencies__

npm install

3. __Link the module to itself__ (so Karma can find the plugin)

npm link

npm link karma-host-environment

4. __Run the tests__

npm test`

License
--------------------------
Karma Host Environment is 100% free and open-source, under the MIT license. Use it however you want.

This package is Treeware. If you use it in production, then we ask that you buy the world a tree to thank us for our work. By contributing to the Treeware forest you’ll be creating employment for local families and restoring wildlife habitats.

Big Thanks To
--------------------------
Thanks to these awesome companies for their support of Open Source developers ❤