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 @covers \Drupal\Core\Render\RenderCache @covers \Drupal\Core\Render\PlaceholderingRenderCache @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);
}