function RendererTest::testRenderTwice

Tests rendering same render array twice.

Tests that a first render returns the rendered output and a second doesn't because of the #printed property. Also tests that correct metadata has been set for re-rendering.

@covers ::render
@covers ::doRender

@dataProvider providerRenderTwice

File

core/tests/Drupal/Tests/Core/Render/RendererTest.php, line 654

Class

RendererTest

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

Namespace

Code

public function testRenderTwice($build) : void {
  $this->assertEquals('kittens', $this->renderer
    ->renderRoot($build));
  $this->assertEquals('kittens', $build['#markup']);
  $this->assertEquals([
    'kittens-147',
  ], $build['#cache']['tags']);
  $this->assertTrue($build['#printed']);
  // We don't want to reprint already printed render arrays.
  $this->assertEquals('', $this->renderer
    ->renderRoot($build));
}