FilterImageLazyLoadTest.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\filter\Unit;

use Drupal\filter\Plugin\Filter\FilterImageLazyLoad;
use Drupal\Tests\UnitTestCase;

/**
 * @coversDefaultClass \Drupal\filter\Plugin\Filter\FilterImageLazyLoad
 * @group editor
 */
final class FilterImageLazyLoadTest extends UnitTestCase {
    
    /**
     * @var \Drupal\filter\Plugin\Filter\FilterImageLazyLoad
     */
    protected FilterImageLazyLoad $filter;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        $this->filter = new FilterImageLazyLoad([], 'filter_image_lazy_load', [
            'provider' => 'test',
        ]);
        parent::setUp();
    }
    
    /**
     * @covers ::process
     *
     * @dataProvider providerHtml
     *
     * @param string $html
     *   Input HTML.
     * @param string $expected
     *   The expected output string.
     */
    public function testProcess(string $html, string $expected) : void {
        $this->assertSame($expected, $this->filter
            ->process($html, 'en')
            ->getProcessedText());
    }
    
    /**
     * Provides data for testProcess.
     *
     * @return array
     *   An array of test data.
     */
    public static function providerHtml() : array {
        return [
            'lazy loading attribute already added' => [
                'html' => '<p><img src="foo.png" loading="lazy"></p>',
                'expected' => '<p><img src="foo.png" loading="lazy"></p>',
            ],
            'eager loading attribute already added' => [
                'html' => '<p><img src="foo.png" loading="eager"/></p>',
                'expected' => '<p><img src="foo.png" loading="eager"></p>',
            ],
            'image dimensions provided' => [
                'html' => '<p><img src="foo.png" width="200" height="200"/></p>',
                'expected' => '<p><img src="foo.png" width="200" height="200" loading="lazy"></p>',
            ],
            'width image dimensions provided' => [
                'html' => '<p><img src="foo.png" width="200"/></p>',
                'expected' => '<p><img src="foo.png" width="200"></p>',
            ],
            'height image dimensions provided' => [
                'html' => '<p><img src="foo.png" height="200"/></p>',
                'expected' => '<p><img src="foo.png" height="200"></p>',
            ],
            'invalid loading attribute' => [
                'html' => '<p><img src="foo.png" width="200" height="200" loading="foo"></p>',
                'expected' => '<p><img src="foo.png" width="200" height="200" loading="lazy"></p>',
            ],
            'no image tag' => [
                'html' => '<p>Lorem ipsum...</p>',
                'expected' => '<p>Lorem ipsum...</p>',
            ],
            'no image dimensions provided' => [
                'html' => '<p><img src="foo.png"></p>',
                'expected' => '<p><img src="foo.png"></p>',
            ],
        ];
    }

}