function RendererPlaceholdersTest::testChildrenPlusBuilder

@covers ::render
@covers ::doRender

File

core/tests/Drupal/Tests/Core/Render/RendererPlaceholdersTest.php, line 899

Class

RendererPlaceholdersTest

@coversDefaultClass \Drupal\Core\Render\Renderer[[api-linebreak]] @covers \Drupal\Core\Render\RenderCache[[api-linebreak]] @covers \Drupal\Core\Render\PlaceholderingRenderCache[[api-linebreak]] @group Render

Namespace

Code

public function testChildrenPlusBuilder() : void {
  $element = [];
  $element['#lazy_builder'] = [
    'Drupal\\Tests\\Core\\Render\\RecursivePlaceholdersTest::callback',
    [],
  ];
  $element['child_a']['#markup'] = 'Oh hai!';
  $element['child_b']['#markup'] = 'goodbye';
  $this->expectException(\AssertionError::class);
  $this->expectExceptionMessage('When a #lazy_builder callback is specified, no children can exist; all children must be generated by the #lazy_builder callback. You specified the following children: child_a, child_b.');
  $this->renderer
    ->renderRoot($element);
}