DateTimeZoneToStringTransformer example

namespace Symfony\Component\Form\Tests\Extension\Core\DataTransformer;

use PHPUnit\Framework\TestCase;
use Symfony\Component\Form\Exception\TransformationFailedException;
use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeZoneToStringTransformer;

class DateTimeZoneToStringTransformerTest extends TestCase
{
    public function testSingle()
    {
        $transformer = new DateTimeZoneToStringTransformer();

        $this->assertNull($transformer->transform(null));
        $this->assertNull($transformer->reverseTransform(null));

        $this->assertSame('Europe/Amsterdam', $transformer->transform(new \DateTimeZone('Europe/Amsterdam')));
        $this->assertEquals(new \DateTimeZone('Europe/Amsterdam'), $transformer->reverseTransform('Europe/Amsterdam'));
    }

    public function testMultiple()
    {
        $transformer = new DateTimeZoneToStringTransformer(true);

        

use Symfony\Component\OptionsResolver\Options;
use Symfony\Component\OptionsResolver\OptionsResolver;

class TimezoneType extends AbstractType
{
    /** * @return void */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        if ('datetimezone' === $options['input']) {
            $builder->addModelTransformer(new DateTimeZoneToStringTransformer($options['multiple']));
        } elseif ('intltimezone' === $options['input']) {
            $builder->addModelTransformer(new IntlTimeZoneToStringTransformer($options['multiple']));
        }
    }

    /** * @return void */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([