function RendererTest::testRenderSorting

@covers ::render @covers ::doRender

File

core/tests/Drupal/Tests/Core/Render/RendererTest.php, line 490

Class

RendererTest

@coversDefaultClass \Drupal\Core\Render\Renderer @group Render

Namespace

Code

public function testRenderSorting() : void {
    $first = $this->randomMachineName();
    $second = $this->randomMachineName();
    // Build an array with '#weight' set for each element.
    $elements = [
        'second' => [
            '#weight' => 10,
            '#markup' => $second,
        ],
        'first' => [
            '#weight' => 0,
            '#markup' => $first,
        ],
    ];
    $output = (string) $this->renderer
        ->renderRoot($elements);
    // The lowest weight element should appear last in $output.
    $this->assertGreaterThan(strpos($output, $first), strpos($output, $second));
    // Confirm that the $elements array has '#sorted' set to TRUE.
    $this->assertTrue($elements['#sorted'], "'#sorted' => TRUE was added to the array");
    // Pass $elements through \Drupal\Core\Render\Element::children() and
    // ensure it remains sorted in the correct order.
    // \Drupal::service('renderer')->render() will return an empty string if
    // used on the same array in the same request.
    $children = Element::children($elements);
    $this->assertSame('first', array_shift($children), 'Child found in the correct order.');
    $this->assertSame('second', array_shift($children), 'Child found in the correct order.');
}