OptGroupTest.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\Core\Form;

use Drupal\Tests\UnitTestCase;
use Drupal\Core\Form\OptGroup;

/**
 * @coversDefaultClass \Drupal\Core\Form\OptGroup
 * @group Form
 */
class OptGroupTest extends UnitTestCase {
  
  /**
   * Tests the flattenOptions() method.
   *
   * @dataProvider providerTestFlattenOptions
   */
  public function testFlattenOptions($options) : void {
    $this->assertSame([
      'foo' => 'foo',
    ], OptGroup::flattenOptions($options));
  }
  
  /**
   * Provides test data for the flattenOptions() method.
   *
   * @return array
   *   An array of option structures to be flattened.
   */
  public static function providerTestFlattenOptions() {
    $object1 = new \stdClass();
    $object1->option = [
      'foo' => 'foo',
    ];
    $object2 = new \stdClass();
    $object2->option = [
      [
        'foo' => 'foo',
      ],
      [
        'foo' => 'foo',
      ],
    ];
    $object3 = new \stdClass();
    return [
      [
        [
          'foo' => 'foo',
        ],
      ],
      [
        [
          [
            'foo' => 'foo',
          ],
        ],
      ],
      [
        [
          $object1,
        ],
      ],
      [
        [
          $object2,
        ],
      ],
      [
        [
          $object1,
          $object2,
        ],
      ],
      [
        [
          'foo' => $object3,
          $object1,
          [
            'foo' => 'foo',
          ],
        ],
      ],
    ];
  }

}