Nightwatch Command for Creating Facebook Test User

createFacebookTestUser.js

var util = require('util');
var events = require('events');
var Promise = require('bluebird');
var request = Promise.promisify(require('request'));

var CreateFacebookTestUser = function() {
    events.EventEmitter.call(this);
};
util.inherits(CreateFacebookTestUser, events.EventEmitter);

var requestAccessToken = function(appSecret, appId) {
    return request({
        url:'https://graph.facebook.com/oauth/access_token?client_id=' + appId + '&client_secret=' + appSecret + '&grant_type=client_credentials'
    }).then(function (args) {
        var body = args[1],
            token = body.split('=')[1];

        if (!token) {
            throw new Error('Could not extract token from body ' + body);
        }

        return token;
    });
};

var createTestUser = function(appId) {
    return function(token) {
        return request({
            method: 'POST',
            url: 'https://graph.facebook.com/' + appId + '/accounts/test-users?access_token=' + token,
            json: true
        });
    };
};

CreateFacebookTestUser.prototype.command = function(callback) {
    var self = this;

    var appSecret = this.client.options.globals.facebookAppSecret,
        appId = this.client.options.globals.facebookAppId;

    requestAccessToken(appSecret, appId)
        .then(createTestUser(appId))
        .then(function (user) {
            console.info('Successfully created Facebook Test User', user[1]);

            if (callback) {
                callback.call(self, null, user[1]);
            }

            self.emit('complete');
        }).error(function (err) {
            console.error('Exception in CreateFacebookTestUser', err);

            if (callback) {
                callback.call(self, err);
            }
            self.emit('complete');
        });
};

module.exports = CreateFacebookTestUser;