function ComponentRenderTest::testCssOrder

Tests the CSS load order.

File

core/tests/Drupal/KernelTests/Component/ComponentRenderTest.php, line 26

Class

ComponentRenderTest

Tests the correct rendering of components.

Namespace

Code

public function testCssOrder() : void {
    $this->container
        ->get('theme_installer')
        ->install([
        'sdc_theme_test',
    ]);
    $build = [
        '#type' => 'component',
        '#component' => 'sdc_theme_test:css-load-order',
        '#props' => [],
    ];
    \Drupal::state()->set('sdc_test_component', $build);
    $request = Request::create('/sdc-test-component');
    $response = $this->container
        ->get('http_kernel')
        ->handle($request);
    $output = $response->getContent();
    $crawler = new Crawler($output);
    // Assert that both CSS files are attached to the page.
    $this->assertNotEmpty($crawler->filter('link[rel="stylesheet"][href*="css-load-order.css"]'));
    $this->assertNotEmpty($crawler->filter('link[rel="stylesheet"][href*="css-order-dependent.css"]'));
    $all_stylesheets = $crawler->filter('link[rel="stylesheet"]');
    $component_position = NULL;
    $dependent_position = NULL;
    foreach ($all_stylesheets as $index => $stylesheet) {
        $href = $stylesheet->attributes
            ->getNamedItem('href')->nodeValue;
        if (str_contains($href, 'css-load-order.css')) {
            $component_position = $index;
        }
        if (str_contains($href, 'css-order-dependent.css')) {
            $dependent_position = $index;
        }
    }
    // This will assert that css-order-dependent.css is loaded before the
    // component's css-load-order.css.
    $this->assertGreaterThan($dependent_position, $component_position);
}