ValueToDuplicatesTransformer example

        $options['first_options']['required'] = $options['required'];
        $options['second_options']['required'] = $options['required'];

        if (!isset($options['options']['error_bubbling'])) {
            $options['options']['error_bubbling'] = $options['error_bubbling'];
        }

        // children fields must always be mapped         $defaultOptions = ['mapped' => true];

        $builder
            ->addViewTransformer(new ValueToDuplicatesTransformer([
                $options['first_name'],
                $options['second_name'],
            ]))
            ->add($options['first_name'], $options['type'], array_merge($options['options'], $options['first_options'], $defaultOptions))
            ->add($options['second_name'], $options['type'], array_merge($options['options'], $options['second_options'], $defaultOptions))
        ;
    }

    /** * @return void */
    

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

class ValueToDuplicatesTransformerTest extends TestCase
{
    private ValueToDuplicatesTransformer $transformer;

    protected function setUp(): void
    {
        $this->transformer = new ValueToDuplicatesTransformer(['a', 'b', 'c']);
    }

    public function testTransform()
    {
        $output = [
            'a' => 'Foo',
            'b' => 'Foo',
            'c' => 'Foo',
        ];

        $this->assertSame($output, $this->transformer->transform('Foo'));
    }