Mocha test for validating emails in an array fails

mochaEmailTest.js

require.paths.unshift('./node_modules');
require('should');
var assert = require('assert');

var mongoose = require('mongoose')
  , Schema = mongoose.Schema
  , mongooseTypes = require("mongoose-types")
  , db = mongoose.createConnection(getMongoUrl());

mongooseTypes.loadTypes(mongoose);

var Email = mongoose.SchemaTypes.Email;


/* if we use the below code.. we get: CALL_NON_FUNCTION_AS_CONSTRUCTOR exception

var emailType = mongoose.SchemaTypes.Email;
var Email = new mongoose.Schema({
       type: emailType,
       unique: true,
       required: true,
       lowercase: true
     });

*/

//this test with just 1 email passes
describe('Schema with just one email; Simple User with an invalid email', function(){
	var UserSchema = new Schema({
  		email: Email
	});
	var User = db.model('User', UserSchema);
	//User.remove({}, function (err) {});



  describe('Save invalid email', function(){
    it('should throw vaidation error', function(done){
      var user = new User({email: 'asdf.com'});
	  user.save(function(err){
       	err.message.should.equal('Validation failed');
        done();
      });
    })
  })
});


//this test with an array of emails fails :(

describe('Schema with an ARRAY of emails; User with 1 or more invalid emails', function(){
	var UserSchema2 = new Schema({
  		emails: [Email]
	});
	var User2 = db.model('User2', UserSchema2);

  describe('Save invalid email', function(){
    it('should throw vaidation error', function(done){
      var user2 = new User2({emails: ["rrr"]});
	  user2.save(function(err){
		  console.log(err);
		assert.exist(err);
		  assert.exist(err.message);
		  assert.equal(err.message, 'Validation failed');
        done();
      });
    })
  })
});



function getMongoUrl() {
    if (process.env.VCAP_SERVICES) {
        var env = JSON.parse(process.env.VCAP_SERVICES);
        var obj = env['mongodb-1.8'][0]['credentials'];
    }
    else {
        var obj = {
            "hostname": "localhost",
            "port": 27017,
            "username": "",
            "password": "",
            "name": "",
            "db": ""
        }
    }
    obj.hostname = (obj.hostname || 'localhost');
    obj.port = (obj.port || 27017);
    obj.db = (obj.db || 'test');

    if (obj.username && obj.password) {
        return "mongodb://" + obj.username + ":" + obj.password + "@" + obj.hostname + ":" + obj.port + "/" + obj.db;
    } else {
        return "mongodb://" + obj.hostname + ":" + obj.port + "/" + obj.db;
    }
}