after login i get /statuses and the Flash message welcome back but test fails

We can't help, if we don't see the code you used to implement this...

Sorry about that, should have added the code. Let me know if this is not enough to clarify

public function store()
 {

  //fetch the form input
        $formData = Input::only('email', 'password');

        // validate the form

        $this->signInForm->validate($formData);

        // invalid then go back

        if(Auth::attempt([
            'email' => Input::get('email'),
            'password' => Input::get('password'),
            'confirmed' => 1 // make sure the user has been email verified
        ]))
        {/*
            if(Agent::isMobile())
            {


            }
          */

            Flash::message('Welcome back!');


            return Redirect::intended('/statuses');

        }else
        {
            Flash::message('Please make sure you verified your email registration and email and password are filled in accurately');

            return Redirect::back();
        }


 }

codecept file is

<?php 
$I = new FunctionalTester($scenario);
$I->am('member');
$I->wantTo('login to my account');
//$I->amNotMobile();
$I->logIn(); // look in FunctionHelper.php for definition of method

$I->seeInCurrentUrl('/statuses');
$I->see('Welcome back!');
$I->assertTrue(Auth::check());

function helper file

<?php
namespace Codeception\Module;

use Laracasts\TestDummy\Factory as TestDummy;

use Jenssegers\Agent\Facades\Agent;

class FunctionalHelper extends \Codeception\Module
{
        public function logIn()
        {
            $email = 'foo@example.com';
            $password = 'foo';

            $this->haveAnAccount(compact('email', 'password'));

            $I = $this->getModule('Laravel4');


            $I->amOnPage('/login');
            $I->fillField('email',$email );
            $I->fillField('password',$password);

            $I->click('Log In');

        }
        public function haveAnAccount($overrides = [])
        {
          TestDummy::create('MyApp\Users\User', $overrides);
        }

        public function amNotMobile()
        {
           ! Agent::isMobile();

        }
}

I am also not sure how I will test Flash:: message and the Agent is Mobile not commented out

Appreciate your help Thx PS a more indepth tutorial on codeception would be great -- again thx