public function ImageLoadingAttributeTest::testImageLoadingAttribute in Drupal 9

Same name and namespace in other branches

1. 10 core/modules/system/tests/src/Functional/Theme/ImageLoadingAttributeTest.php \Drupal\Tests\system\Functional\Theme\ImageLoadingAttributeTest::testImageLoadingAttribute()

Tests that loading attribute is enabled for images.

File

core/modules/system/tests/src/Functional/Theme/ImageLoadingAttributeTest.php, line 29

Class

ImageLoadingAttributeTest

Tests lazy loading for images.

Namespace

Drupal\Tests\system\Functional\Theme

Code

public function testImageLoadingAttribute() {
  $assert = $this
    ->assertSession();

  // Get page under test.
  $this
    ->drupalGet('image-lazy-load-test');

  // Loading attribute is added when image dimensions has been set.
  $assert
    ->elementAttributeExists('css', '#with-dimensions img', 'loading');
  $assert
    ->elementAttributeContains('css', '#with-dimensions img', 'loading', 'lazy');

  // Loading attribute with lazy default value can be overridden.
  $assert
    ->elementAttributeContains('css', '#override-loading-attribute img', 'loading', 'eager');

  // Without image dimensions loading attribute is not generated.
  $element = $assert
    ->elementExists('css', '#without-dimensions img');
  $this
    ->assertFalse($element
    ->hasAttribute('loading'));
}