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Generator Tests for Mocha

So you really like Mocha. But you also really like generators & promises. And you'd like to see support in Mocha for the promise-returning test style found in Buster and others, i.e. stuff like

it("should be fulfilled with 5", function *() {
    var num = yield getNum(5);
it("should throw an error", function *() {
    try {
        var someError = new TypeError('some error!');
        var result = yield getError(someError);
    } catch (error) {

Origin Note

This is a fork of the mocha-as-promised - repo, but extended to also allow the use of generator functions as well.

How to Use

Once you install and set up Mocha as Generated, you now have another way of creating asynchronous tests, besides Mocha's usual done-callback style or Mocha-As-generated's promise style. Just return a generator and use yields like you would expect.

Moch as Generated works with all Mocha interfaces: BDD, TDD, QUnit, whatever. It hooks in at such a low level, the interfaces don't even get involved.

Installation and Usage


Do an npm install mocha-as-generated --save-dev to get up and running. Then:


You can of course put this code in a common test fixture file.


Mocha as Generated supports being used as an AMD module, registering itself anonymously. So, assuming you have configured your loader to map the Mocha and Mocha as Generated files to the respective module IDs "mocha" and "mocha-as-generated", you can use them as follows:

define(function (require, exports, module) {
    var mocha = require("mocha");
    var mochaAsGenerated = require("mocha-as-generated");

<script> tag

If you include Mocha as Generated directly with a <script> tag, after the one for Mocha itself, then it will automatically plug in to Mocha and be ready for use:

<script src="mocha.js"></script>
<script src="mocha-as-generated.js"></script>

Node, the Advanced Version

The require("mocha-as-generated")() above tries to detect which instance of Mocha is being used automatically. This way, Mocha as Generated can plug into either the local Mocha instance installed into your project, or into the global Mocha instance if you're running your tests using the globally-installed command-line runner.

In some cases, if you're doing something weird, this can fall down. In these cases, you can pass an array of Mocha instances into the Mocha as Generated function. For example, if you somehow had your Mocha module as a property of the foo module, instead of it being found in the usual npm directory structures, you would do