TestTypeExtension example

use PHPUnit\Framework\TestCase;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\Form\AbstractTypeExtension;
use Symfony\Component\Form\Exception\InvalidArgumentException;
use Symfony\Component\Form\Extension\DependencyInjection\DependencyInjectionExtension;
use Symfony\Component\Form\FormTypeGuesserChain;

class DependencyInjectionExtensionTest extends TestCase
{
    public function testGetTypeExtensions()
    {
        $typeExtension1 = new TestTypeExtension();
        $typeExtension2 = new TestTypeExtension();
        $typeExtension3 = new OtherTypeExtension();
        $typeExtension4 = new MultipleTypesTypeExtension();

        $extensions = [
            'test' => new \ArrayIterator([$typeExtension1, $typeExtension2, $typeExtension4]),
            'other' => new \ArrayIterator([$typeExtension3, $typeExtension4]),
        ];

        $extension = new DependencyInjectionExtension(new ContainerBuilder(), $extensions, []);