Cannot fromArray a toArray with many to many records

class Doctrine_Ticket_DC774_TestCase extends Doctrine_UnitTestCase
{
    public function prepareTables()
    {
        $this->tables[] = 'EntityAddress';
        $this->tables[] = 'Book';
        parent::prepareTables();
    }

    public function prepareData()
    {
        $user = new User();
        $user->name = 'TestUser';

        $address = new Address();
        $address->address = 'TestAddress';

        $user->Addresses[] = $address;
        
        $user->save();
    }

    public function testToArraySynchronizeWithManyToMany() {
        $user = Doctrine_Core::getTable('User')->findOneByName('TestUser');
        $user->refreshRelated();
        $user->synchronizeWithArray($user->toArray());
    }

    public function testToArrayFromManyToMany() {
        $user = Doctrine_Core::getTable('User')->findOneByName('TestUser');
        $user->refreshRelated();
        $user->fromArray($user->toArray());
    }
}