OptGroupTest.php

<?php

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) {
        $this->assertSame([
            'foo' => 'foo',
        ], OptGroup::flattenOptions($options));
    }
    
    /**
     * Provides test data for the flattenOptions() method.
     *
     * @return array
     */
    public 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',
                    ],
                ],
            ],
        ];
    }

}