RenderTest.php

<?php

namespace Drupal\KernelTests\Core\Render;

use Drupal\KernelTests\KernelTestBase;

/**
 * Performs functional tests on \Drupal::service('renderer')->render().
 *
 * @group Common
 */
class RenderTest extends KernelTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'system',
        'common_test',
        'theme_test',
    ];
    
    /**
     * Tests theme preprocess functions being able to attach assets.
     */
    public function testDrupalRenderThemePreprocessAttached() {
        \Drupal::state()->set('theme_preprocess_attached_test', TRUE);
        $test_element = [
            '#theme' => 'common_test_render_element',
            'foo' => [
                '#markup' => 'Kittens!',
            ],
        ];
        \Drupal::service('renderer')->renderRoot($test_element);
        $expected_attached = [
            'library' => [
                'test/generic_preprocess',
                'test/specific_preprocess',
            ],
        ];
        $this->assertEquals($expected_attached, $test_element['#attached'], 'All expected assets from theme preprocess hooks attached.');
        \Drupal::state()->set('theme_preprocess_attached_test', FALSE);
    }
    
    /**
     * Ensures that render array children are processed correctly.
     */
    public function testRenderChildren() {
        // Ensure that #prefix and #suffix is only being printed once since that is
        // the behavior the caller code expects.
        $build = [
            '#type' => 'container',
            '#theme' => 'theme_test_render_element_children',
            '#prefix' => 'kangaroo',
            '#suffix' => 'kitten',
        ];
        $this->render($build);
        $this->removeWhiteSpace();
        $this->assertNoRaw('<div>kangarookitten</div>');
    }
    
    /**
     * Tests that we get an exception when we try to attach an illegal type.
     */
    public function testProcessAttached() {
        // Specify invalid attachments in a render array.
        $build['#attached']['library'][] = 'core/drupal.states';
        $build['#attached']['drupal_process_states'][] = [];
        $renderer = $this->container
            ->get('bare_html_page_renderer');
        $this->expectException(\LogicException::class);
        $renderer->renderBarePage($build, '', 'maintenance_page');
    }

}