An utility to avoid waterfalling of frisby tests throught middleware chains

frisbyChain.js

var frisby = require ('frisby');

/* FrisbyChain */
var frisbyChain = function (baseData, callChain) {
	callChain.push (function (data) {});
	
	var nextPrepare = function (data, i) {
		if (i < callChain.length)
			return function (data, next) {
				return callChain[i] (data, nextPrepare (data, i+1));
			};
		else
			return function (data) {
				return callChain[i] (data);
			};
	};
	
	return nextPrepare (baseData, 0)(baseData);
};


/* Example usage */
frisbyChain ({username: 'frisbytest_gianni1', usertype: 'singleuser', email: 'frisbytest_gianni1@gmail.com',
						password: 'frisbytest_gianni1'}, [
	function (data, next) {
		frisby.create ('/signup - create account')
			.post ('http://localhost:3000/api/v1/signup', {
				username: data['username'],
				email: data['email'],
				password: data['password'],
				terms: true,
				newsletter: false,
				usertype: data['usertype']
			}, {json: true})
			.expectStatus (200)
			.afterJSON ( function (json) {
				next (data);
			}).toss ();
	},
	function (data, next) {
		frisby.create ('/login - correct login')
			.post ('http://localhost:3000/api/v1/login', {
				user: data['username'],
				password: data['password'],
			}, {json: true})
			.expectStatus (200)
			.expectJSON ({
				username: data['username']
			})
			.expectJSONTypes({
				token: String,
				username: String,
				expiration: Number
			}).after(function(err, res, body) {
				data ['token'] = body.token;
				next (data);
			}).toss ();
	},
	function (data) {
		console.log (data);
	}
]);