FormTestHelper

FormTestHelper.php

<?php

use Symfony\Component\Form\FormView;

/**
 * The following converts a form view into a snapshot able format, to test different form types and form builders.
 */
class FormTestHelper
{
    /**
     * @param array<string, array{
     *      type: string,
     *      required?: true,
     *      disabled?: true,
     *  }|string> $fields
     *
     * @return array<string, array{
     *     type: string,
     *     required?: true,
     *     disabled?: true,
     * }|string>
     */
    public static function extractFormFields(FormView $formView, array &$fields = []): array
    {
        foreach ($formView as $child) {
            if (\count($child) > 0) {
                self::extractFormFields($child, $fields);

                continue;
            }

            $fullName = $child->vars['full_name'];
            $types = $child->vars['block_prefixes'];
            $type = $types[\count($types) - 2] ?? null;
            \assert(null !== $type, 'A type should always be present.');

            $fieldConfig = [
                'type' => $type,
            ];

            if ($child->vars['required']) {
                $fieldConfig['required'] = true;
            }

            if ($child->vars['disabled']) {
                $fieldConfig['disabled'] = true;
            }

            if (1 === \count($fieldConfig)) {
                $fieldConfig = $type;
            }

            $fields[$fullName] = $fieldConfig;
        }

        return $fields;
    }
}

SomeTest.php

<?php

use Symfony\Component\Form\FormView
  
use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
use FormTestHelper;

class SomeTest extends KernelTestCase
{
    public function testForm(): void
    {
        $form = self::getContainer()->get('form.factory')->create(MyFormType::class, [], []);
      
        $this->assertSame([
            // ..
        ], FormTestHelper->extractFormFields($form->createView()));
    }
}