Functional tests for standalone Symfony2 bundles

AppKernel.php

<?php                                                                                                                                                                                                              

use Symfony\Component\HttpKernel\Kernel;
use Symfony\Component\Config\Loader\LoaderInterface;

class AppKernel extends Kernel
{
    public function registerBundles()
    {   
        return array(
            new Symfony\Bundle\FrameworkBundle\FrameworkBundle(),
            // register the other bundles your tests depend on

            // and don't forget your own bunde!
            new ACME\HelloBundle\AcmeHelloBundle(),
        );
    }   

    public function registerContainerConfiguration(LoaderInterface $loader)
    {   
        $loader->load(__DIR__.'/config/config_'.$this->getEnvironment().'.yml');
    }   

    /** 
     * @return string
     */
    public function getCacheDir()
    {   
        return sys_get_temp_dir().'/AcmeHelloBundle/cache';
    }   

    /** 
     * @return string
     */
    public function getLogDir()
    {   
        return sys_get_temp_dir().'/AcmeHelloBundle/logs';
    }   
}

composer.json

{
    "name": "acme/hello-bundle",
    "type": "symfony-bundle",
    "require": {
        "symfony/symfony": "2.1.*",
        "sensio/framework-extra-bundle": "2.1.x"
    },
    "require-dev": {
        "doctrine/orm": "*",
        "doctrine/doctrine-bundle": "*",
        "symfony/assetic-bundle": "*",
        "behat/behat-bundle": "*",
        "behat/mink-bundle": "*",
        "behat/sahi-client": "*"
    },
    "autoload": {
        "psr-0": { "Acme\\HelloBundle": "" }
    },
    "target-dir": "Acme/HelloBundle"
}

config.yml

framework:                                                                                                                                                                                                         
    secret:          Hell yeah!
    router:          { resource: "%kernel.root_dir%/config/routing.yml" }
    form:            true
    csrf_protection: true
    session:         ~
    default_locale:  en  
    translator:      { fallback: en }
    profiler:        { only_exceptions: false }

config_test.yml

imports:                                                                                                                                                                                                           
    - { resource: config.yml }

framework:
    test: ~
    session:
        storage_id: session.storage.filesystem

phpunit.xml

<?xml version="1.0" encoding="UTF-8"?>                                                                                                                                                                             
<phpunit backupGlobals="false"
         backupStaticAttributes="false"
         colors="true"
         convertErrorsToExceptions="true"
         convertNoticesToExceptions="true"
         convertWarningsToExceptions="true"
         processIsolation="false"
         stopOnFailure="false"
         syntaxCheck="false"
         bootstrap="Tests/bootstrap.php"
>
    <testsuites>
        <testsuite name="HelloBundle Test Suite">
            <directory>./Tests/</directory>
        </testsuite>
    </testsuites>

    <php>
        <server name="KERNEL_DIR" value="./Tests/Fixtures/App/app" />
    </php>
</phpunit>

routing.yml

hello_bundle:                                                                                                                                                                                                    
    resource: "@ACMEHelloBundle/Resources/config/routing.yml"