Symfony Form Unit Test with Collections - php

Question

I'm trying to make my firsts unit tests and functionnal tests with Symfony3 / PHPunit and I don't find solutions to my problem.
To be simple, I'm trying to Unit Test a form created to manage Users and Groups (provided by FOSUserBundle)
I followed the steps of the Symfony documentation to test my form, and I already solved some issues concerning getExtensions(), etc... to be able to run my test without any error
Here is my UserType.php :
<?php
...
class UserType extends BaseCrudForm
{
/**
* {#inheritdoc}
*/
public function buildForm(FormBuilderInterface $builder, array $options)
{
parent::buildForm($builder, $options);
$builder
->add('username', null, array('label' => 'label.username'))
->add('email', EmailType::class, array(
'label' => 'label.email',
'constraints' => array(
new Email()
)
))
->add('enabled', CheckboxType::class, array('label' => 'label.enabled', 'required' => false))
->add('groups', EntityType::class, array(
'class' => 'Acme\AdminBundle\Entity\Group',
'multiple' => true,
'required' => false,
))
->add('avatarImageFile', FileType::class, array('label' => 'label.avatar', 'required' => false))
;
}
...
}
and my UserTypeTest.php (I left my tests into it) :
<?php
...
class UserTypeTest extends BaseTypeTestCase
{
public function testSubmitValidData()
{
$formData = array(
'username' => 'nathalie_' . time(),
'email' => 'nathalie_' . time() . '#portman.fr',
'enabled' => true,
'plainPassword' => 'pa$$word',
///// SOLUTION 1
'groups' => array(
$this->em->getRepository('AcmeAdminBundle:Group')->find(1)
),
///// SOLUTION 2
'groups' => array(1),
);
$form = $this->factory->create(UserType::class);
$user = User::fromArray($formData);
$form->submit($formData);
$this->assertTrue($form->isSynchronized());
// dump($user, $form->getData());
$this->assertEquals($user, $form->getData()); //Fails
$view = $form->createView();
$children = $view->children;
foreach(array_keys($formData) as $key) {
$this->assertArrayHasKey($key, $children);
}
}
}
Problem :
The assert $this->assertEquals($user, $form->getData()); fails, because of the collection User::groups that is not equal
Solution 1 is not working (see code above)
The collection of $user is ok, but the form data is empty
Solution 2 is not working neither (see code above)
The form data is ok, but the $user collection is instantiated with a simple array(1) (sees logic)
Question
How could I instanciate correctly my object User and my form at the same time with the same informations (as it's described in the Symfony documentation a linked in top of this topic) ?
Note: as I said I'm a newbie with Unit Tests, so don't hesitate to tell me if I miss the point
Edit
Here is the fromArray function, implemented as a Trait in the User entity :
<?php
namespace Acme\AdminBundle\Traits;
use Doctrine\Common\Util\Inflector;
trait FromArrayTrait
{
/**
* #param array $data
* #return self
*/
public static function fromArray(array $data)
{
$object = new self;
foreach ($data as $key => $value) {
$method = 'set' . Inflector::classify($key);
if (method_exists($object, $method)) {
call_user_func(array($object, $method), $value);
}
}
return $object;
}
}