mocha-grunt

Mocha + Grunt

This example shows how to use Babel in conjunction with Mocha and Grunt.

Installation

1. Clone this repository
2. Navigate to this directory via cd examples/mocha-grunt
3. Install the npm dependencies via npm install

Running the tests

Run npm test

How it works

When npm test is run, the aliased script in our package.json is run. That alias is simply grunt, which runs the default grunt task.

This task is defined in gruntfile.js. Let's look at that task.

grunt-mocha-test

Because these are Node-only tests, we're using the grunt-mocha-test package. The more idiomatically-named grunt-mocha is for running tests in PhantomJS, but that's a use case for another example.

babel-register

The key to this example is specifying babel-register in the require option for mochaTest. This use case is described in the documentation for that Grunt task.

.babelrc

There's one last important detail that makes all of this work: the .babelrc file. Our configuration in that file tells Babel that we want to transpile ES2015 code into ES5 code. This is necessary because Babel makes no assumptions about how you want to transform the code as of v6.

A note on Chai

These examples all use Chai as the assertion library for the tests. It should be relatively straightforward to swap it out for your assertion library of choice, which is why I haven't included other examples. If you're having trouble, raise an issue and I'll be glad to help out.