Use generator functions in mocha js test suite methods.

mocha-generators.js

/**
 * Make sure the following is included in `/test/index.js`
 * 
 * ```javascript
 * 'use strict';
 * 
 * const mocha = require('mocha');
 * const coMocha = require('co-mocha');
 * 
 * coMocha(mocha);
 * 
 * // require your test files here..
 * ```
 * 
 * After including this snippet, you can use generators in mocha test suite methods.
 */
 
 const chai = require('chai');
 
 const expect = chai.expect;
 
 describe('Use generators', function () {
 	it('yield a Promise that resolves with a Number', function *() {
		const value = yield Promise.resolve(8);
 		
		expect(value).to.equal(8);
	});
 	
	it('yield a Promise that rejects with an Error', function *() {
		let value;

		try {
			value = yield Promise.reject(new Error('Kaput'));
		} catch(err) {
			expect(value).to.be.undefined;
			expect(err.message).to.equal('Kaput');
 		}
 	});
 });