❗ Deprecation Notice

We want to express our sincere gratitude for your support and contributions to this open source project. As we are no longer using this technology internally, we have come to the decision to archive this repository. While we won't be providing further updates or support, the existing code and resources will remain accessible for your reference. We encourage anyone interested to fork the repository and continue the project's legacy independently. Thank you for being a part of this journey and for your patience and understanding.

mocha-wrap

Fluent pluggable interface for easily wrapping describe, context, it, and specify blocks in Mocha tests.

Example

var wrap = require('mocha-wrap');
var expect = require('chai').expect;

var mockWindow = {
	location: {
		href: 'test/url'
	}
};
wrap().withGlobal('window', () => mockWindow).describe('mocked window', function () {
	it('is mocked', function () {
		expect(window).to.equal(mockWindow);
	});

	it('has the right URL', function () {
		expect(window.location.href).to.equal('test/url');
	});
});

var obj = { a: 1 };
wrap().withOverrides(() => obj, () => ({ a: 2, b: 3 })).describe('overridden object keys', function () {
	it('has "b"', function () {
		expect(obj.b).to.equal(3);
	});

	it('has overridden "a"', function () {
		expect(obj.a).to.equal(2);
	});
});

wrap().withOverride(() => obj, 'a', () => 4).skip().describe('this test is skipped', function () {
	it('also supports .only()!', function () {
		expect(true).to.equal(false); // skipped
	});
});

Plugins

A mocha-wrap plugin is a named function that returns a MochaWrapper instance or a descriptor object.

• A plugin’s function name must begin with the string “with”.

• Plugins can be globally registered, or .used ad-hoc.

• .use requires a plugin function as its first argument; further arguments are passed through to the plugin.

• .extend requires a non-empty description string, and a descriptor object which may contain a value that is a function, or an array of functions, whose keys correspond to any or all of the supported mocha methods.

• Globally registered plugins, .use calls, and .extend calls can be chained, stored, and reused - each link in the chain creates a new instance of a MochaWrapper.

• A descriptor object may contain any or all of these 5 keys:

• a description string, for use in “describe” and/or “it” (this is required when returning an object)

• beforeEach: a function, or array of functions, for use in a mocha beforeEach function

• afterEach: a function, or array of functions, for use in a mocha afterEach function

• before: a function, or array of functions, for use in a mocha before function

• after: a function, or array of functions, for use in a mocha after function

The most common approach will be for a plugin function to return this.extend(description, descriptor).

A plugin function must have a name that starts with “with”, and will be invoked with a receiver (”this” value) of a MochaWrapper instance.

To register a plugin, call the register function on mocha-wrap with the plugin function. This should not be done in a reusable module.

module.exports = function withFoo(any, args, you, want) {
	return this.extend('with some foo stuff', {
		beforeEach: function () {
			// setup ran before each test
		},
		afterEach: [
			function () {
				// teardown ran after each test
			},
			function () {
				// more teardown
			}
		],
		before: function () {
			// setup ran once before all tests
		},
		after: function () {
			// teardown ran once after all tests
		}
	});
};

Usage

var wrap = require('mocha-wrap');
wrap.register(require('mocha-wrap-with-foo'));

wrap().withFoo().describe…

skip/only

Although mocha has describe.skip, describe.only, context.skip, context.only, it.skip, it.only, specify.skip, and specify.only, it is not possible to implement these in mocha-wrap without using ES5 property accessors. Since this project supports ES3, we decided to use .skip().describe etc rather than forfeit the ability to have skip/only.

Tests

Simply clone the repo, npm install, and run npm test