function ModernRenderElementTest::testChildren

File

core/tests/Drupal/Tests/Core/Render/Element/ModernRenderElementTest.php, line 19

Class

ModernRenderElementTest

@coversDefaultClass \Drupal\Core\Render\Element\RenderElementBase[[api-linebreak]] @group Render

Namespace

Code

public function testChildren() : void {
  $factory = $this->createMock(FactoryInterface::class);
  $elementInfoManager = new class ($factory) extends ElementInfoManager {
    public function __construct(protected $factory) {
    }

};
  $factory->expects($this->any())
    ->method('createInstance')
    ->willReturnCallback(fn() => new Textfield([], '', NULL, $elementInfoManager));
  // If the type is not given ::fromRenderable presumes "form" and uses the
  // plugin discovery to find which class provides the form element. This
  // test does not set up discovery so some type must be provided.
  $element = [
    '#type' => 'ignored by the mock factory',
  ];
  $elementObject = $elementInfoManager->fromRenderable($element);
  for ($i = 0; $i <= 2; $i++) {
    $child = [
      '#type' => 'ignored by the mock factory',
      '#test' => $i,
    ];
    $elementObject->addChild("test{$i}", $child);
    // addChild() takes the $child render array by reference and stores a
    // reference to it in the render object. To avoid modifying the
    // previously created render object when reusing the $child variable,
    // unset() it to break the reference before reassigning.
    unset($child);
  }
  foreach ([
    1 => [
      'test0',
      'test1',
      'test2',
    ],
    2 => [
      'test0',
      'test2',
    ],
  ] as $delta => $expectedChildrenKeys) {
    $i = 0;
    foreach ($elementObject->getChildren() as $name => $child) {
      $this->assertSame($name, "test{$i}");
      $this->assertSame($i, $child->test);
      $i += $delta;
    }
    $this->assertSame(Element::children($elementObject->toRenderable()), $expectedChildrenKeys);
    // The first iteration tests removing an existing child. The second
    // iteration tests removing a nonexistent child.
    $elementObject->removeChild('test1');
  }
}