public function AttributeTest::testAdd in Drupal 9

Same name and namespace in other branches

1. 8 core/tests/Drupal/Tests/Core/Template/AttributeTest.php \Drupal\Tests\Core\Template\AttributeTest::testAdd()
2. 10 core/tests/Drupal/Tests/Core/Template/AttributeTest.php \Drupal\Tests\Core\Template\AttributeTest::testAdd()

Tests adding new values to an existing part of the attribute.

File

core/tests/Drupal/Tests/Core/Template/AttributeTest.php, line 61

Class

AttributeTest

@coversDefaultClass \Drupal\Core\Template\Attribute @group Template

Namespace

Drupal\Tests\Core\Template

Code

public function testAdd() {
  $attribute = new Attribute([
    'class' => [
      'example-class',
    ],
  ]);
  $attribute['class'][] = 'other-class';
  $this
    ->assertEquals(new AttributeArray('class', [
    'example-class',
    'other-class',
  ]), $attribute['class']);
}