class AttachedAssetsTest

class AttachedAssetsTest extends KernelTestBase {
  
  /**
   * The asset resolver service.
   *
   * @var \Drupal\Core\Asset\AssetResolverInterface
   */
  protected $assetResolver;
  
  /**
   * The renderer service.
   *
   * @var \Drupal\Core\Render\RendererInterface
   */
  protected $renderer;
  
  /**
   * The file URL generator.
   *
   * @var \Drupal\Core\File\FileUrlGeneratorInterface
   */
  protected $fileUrlGenerator;
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'language',
    'common_test',
    'system',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->assetResolver = $this->container
      ->get('asset.resolver');
    $this->renderer = $this->container
      ->get('renderer');
    $this->fileUrlGenerator = $this->container
      ->get('file_url_generator');
  }
  
  /**
   * Tests that default CSS and JavaScript is empty.
   */
  public function testDefault() : void {
    $assets = new AttachedAssets();
    $this->assertEquals([], $this->assetResolver
      ->getCssAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage()), 'Default CSS is empty.');
    [$js_assets_header, $js_assets_footer] = $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage());
    $this->assertEquals([], $js_assets_header, 'Default header JavaScript is empty.');
    $this->assertEquals([], $js_assets_footer, 'Default footer JavaScript is empty.');
  }
  
  /**
   * Tests non-existing libraries.
   */
  public function testLibraryUnknown() : void {
    $build['#attached']['library'][] = 'core/unknown';
    $assets = AttachedAssets::createFromRenderArray($build);
    $this->assertSame([], $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage())[0], 'Unknown library was not added to the page.');
  }
  
  /**
   * Tests adding a CSS and a JavaScript file.
   */
  public function testAddFiles() : void {
    $build['#attached']['library'][] = 'common_test/files';
    $assets = AttachedAssets::createFromRenderArray($build);
    $css = $this->assetResolver
      ->getCssAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage());
    $js = $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $this->assertArrayHasKey('core/modules/system/tests/modules/common_test/bar.css', $css);
    $this->assertArrayHasKey('core/modules/system/tests/modules/common_test/foo.js', $js);
    $css_render_array = \Drupal::service('asset.css.collection_renderer')->render($css);
    $js_render_array = \Drupal::service('asset.js.collection_renderer')->render($js);
    $rendered_css = (string) $this->renderer
      ->renderInIsolation($css_render_array);
    $rendered_js = (string) $this->renderer
      ->renderInIsolation($js_render_array);
    $query_string = $this->container
      ->get('asset.query_string')
      ->get();
    $this->assertStringContainsString('<link rel="stylesheet" media="all" href="' . $this->fileUrlGenerator
      ->generateString('core/modules/system/tests/modules/common_test/bar.css') . '?' . $query_string . '" />', $rendered_css, 'Rendering an external CSS file.');
    $this->assertStringContainsString('<script src="' . $this->fileUrlGenerator
      ->generateString('core/modules/system/tests/modules/common_test/foo.js') . '?' . $query_string . '"></script>', $rendered_js, 'Rendering an external JavaScript file.');
  }
  
  /**
   * Tests adding JavaScript settings.
   */
  public function testAddJsSettings() : void {
    // Add a file in order to test default settings.
    $build['#attached']['library'][] = 'core/drupalSettings';
    $assets = AttachedAssets::createFromRenderArray($build);
    $this->assertEquals([], $assets->getSettings(), 'JavaScript settings on $assets are empty.');
    $javascript = $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $this->assertArrayHasKey('currentPath', $javascript['drupalSettings']['data']['path']);
    $this->assertArrayHasKey('currentPath', $assets->getSettings()['path']);
    $assets->setSettings([
      'drupal' => 'rocks',
      'dries' => 280342800,
    ]);
    $javascript = $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $this->assertEquals(280342800, $javascript['drupalSettings']['data']['dries'], 'JavaScript setting is set correctly.');
    $this->assertEquals('rocks', $javascript['drupalSettings']['data']['drupal'], 'The other JavaScript setting is set correctly.');
  }
  
  /**
   * Tests adding external CSS and JavaScript files.
   */
  public function testAddExternalFiles() : void {
    $build['#attached']['library'][] = 'common_test/external';
    $assets = AttachedAssets::createFromRenderArray($build);
    $css = $this->assetResolver
      ->getCssAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage());
    $js = $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $this->assertArrayHasKey('http://example.com/stylesheet.css', $css);
    $this->assertArrayHasKey('http://example.com/script.js', $js);
    $css_render_array = \Drupal::service('asset.css.collection_renderer')->render($css);
    $js_render_array = \Drupal::service('asset.js.collection_renderer')->render($js);
    $rendered_css = (string) $this->renderer
      ->renderInIsolation($css_render_array);
    $rendered_js = (string) $this->renderer
      ->renderInIsolation($js_render_array);
    $this->assertStringContainsString('<link rel="stylesheet" media="all" href="http://example.com/stylesheet.css" />', $rendered_css, 'Rendering an external CSS file.');
    $this->assertStringContainsString('<script src="http://example.com/script.js"></script>', $rendered_js, 'Rendering an external JavaScript file.');
  }
  
  /**
   * Tests adding JavaScript files with additional attributes.
   */
  public function testAttributes() : void {
    $build['#attached']['library'][] = 'common_test/js-attributes';
    $assets = AttachedAssets::createFromRenderArray($build);
    $js = $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $js_render_array = \Drupal::service('asset.js.collection_renderer')->render($js);
    $rendered_js = (string) $this->renderer
      ->renderInIsolation($js_render_array);
    $expected_1 = '<script src="http://example.com/deferred-external.js" foo="bar" defer></script>';
    $expected_2 = '<script src="' . $this->fileUrlGenerator
      ->generateString('core/modules/system/tests/modules/common_test/deferred-internal.js') . '?v=1" defer bar="foo"></script>';
    $this->assertStringContainsString($expected_1, $rendered_js, 'Rendered external JavaScript with correct defer and random attributes.');
    $this->assertStringContainsString($expected_2, $rendered_js, 'Rendered internal JavaScript with correct defer and random attributes.');
  }
  
  /**
   * Tests that attributes are maintained when JS aggregation is enabled.
   */
  public function testAggregatedAttributes() : void {
    $build['#attached']['library'][] = 'common_test/js-attributes';
    $assets = AttachedAssets::createFromRenderArray($build);
    $js = $this->assetResolver
      ->getJsAssets($assets, TRUE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $js_render_array = \Drupal::service('asset.js.collection_renderer')->render($js);
    $rendered_js = (string) $this->renderer
      ->renderInIsolation($js_render_array);
    $expected_1 = '<script src="http://example.com/deferred-external.js" foo="bar" defer></script>';
    $expected_2 = '<script src="' . $this->fileUrlGenerator
      ->generateString('core/modules/system/tests/modules/common_test/deferred-internal.js') . '?v=1" defer bar="foo"></script>';
    $this->assertStringContainsString($expected_1, $rendered_js, 'Rendered external JavaScript with correct defer and random attributes.');
    $this->assertStringContainsString($expected_2, $rendered_js, 'Rendered internal JavaScript with correct defer and random attributes.');
  }
  
  /**
   * Integration test for CSS/JS aggregation.
   */
  public function testAggregation() : void {
    $build['#attached']['library'][] = 'core/drupal.timezone';
    $build['#attached']['library'][] = 'core/drupal.vertical-tabs';
    $assets = AttachedAssets::createFromRenderArray($build);
    $this->assertCount(1, $this->assetResolver
      ->getCssAssets($assets, TRUE, \Drupal::languageManager()->getCurrentLanguage()), 'There is a sole aggregated CSS asset.');
    [$header_js, $footer_js] = $this->assetResolver
      ->getJsAssets($assets, TRUE, \Drupal::languageManager()->getCurrentLanguage());
    $this->assertEquals([], \Drupal::service('asset.js.collection_renderer')->render($header_js), 'There are 0 JavaScript assets in the header.');
    $rendered_footer_js = \Drupal::service('asset.js.collection_renderer')->render($footer_js);
    $this->assertCount(3, $rendered_footer_js, 'There are 3 JavaScript assets in the footer.');
    $this->assertEquals('drupal-settings-json', $rendered_footer_js[0]['#attributes']['data-drupal-selector'], 'The first of the two JavaScript assets in the footer has drupal settings.');
    $this->assertStringContainsString('jquery.min.js', $rendered_footer_js[1]['#attributes']['src'], 'The second of the two JavaScript assets in the footer is jquery.min.js.');
    $this->assertStringStartsWith(base_path(), $rendered_footer_js[2]['#attributes']['src'], 'The third of the two JavaScript assets in the footer has the sole aggregated JavaScript asset.');
  }
  
  /**
   * Tests JavaScript settings.
   */
  public function testSettings() : void {
    $build = [];
    $build['#attached']['library'][] = 'core/drupalSettings';
    // Nonsensical value to verify if it's possible to override path settings.
    $build['#attached']['drupalSettings']['path']['pathPrefix'] = 'does_not_exist';
    $assets = AttachedAssets::createFromRenderArray($build);
    $js = $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $js_render_array = \Drupal::service('asset.js.collection_renderer')->render($js);
    // Cast to string since this returns a \Drupal\Core\Render\Markup object.
    $rendered_js = (string) $this->renderer
      ->renderInIsolation($js_render_array);
    // Parse the generated drupalSettings <script> back to a PHP representation.
    $startToken = '{';
    $endToken = '}';
    $start = strpos($rendered_js, $startToken);
    $end = strrpos($rendered_js, $endToken);
    // Convert to a string, as $renderer_js is a \Drupal\Core\Render\Markup
    // object.
    $json = mb_substr($rendered_js, $start, $end - $start + 1);
    $parsed_settings = Json::decode($json);
    // Test whether the settings for core/drupalSettings are available.
    $this->assertTrue(isset($parsed_settings['path']['baseUrl']), 'drupalSettings.path.baseUrl is present.');
    $this->assertSame('does_not_exist', $parsed_settings['path']['pathPrefix'], 'drupalSettings.path.pathPrefix is present and has the correct (overridden) value.');
    $this->assertSame('', $parsed_settings['path']['currentPath'], 'drupalSettings.path.currentPath is present and has the correct value.');
    $this->assertFalse($parsed_settings['path']['currentPathIsAdmin'], 'drupalSettings.path.currentPathIsAdmin is present and has the correct value.');
    $this->assertFalse($parsed_settings['path']['isFront'], 'drupalSettings.path.isFront is present and has the correct value.');
    $this->assertSame('en', $parsed_settings['path']['currentLanguage'], 'drupalSettings.path.currentLanguage is present and has the correct value.');
    // Tests whether altering JavaScript settings via hook_js_settings_alter()
    // is working as expected.
    // @see common_test_js_settings_alter()
    $this->assertSame('☃', $parsed_settings['pluralDelimiter']);
    $this->assertSame('bar', $parsed_settings['foo']);
  }
  
  /**
   * Tests JS assets depending on the 'core/<head>' virtual library.
   */
  public function testHeaderHTML() : void {
    $build['#attached']['library'][] = 'common_test/js-header';
    $assets = AttachedAssets::createFromRenderArray($build);
    $js = $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage())[0];
    $js_render_array = \Drupal::service('asset.js.collection_renderer')->render($js);
    $rendered_js = (string) $this->renderer
      ->renderInIsolation($js_render_array);
    $query_string = $this->container
      ->get('asset.query_string')
      ->get();
    $this->assertStringContainsString('<script src="' . $this->fileUrlGenerator
      ->generateString('core/modules/system/tests/modules/common_test/header.js') . '?' . $query_string . '"></script>', $rendered_js, 'The JS asset in common_test/js-header appears in the header.');
    $this->assertStringContainsString('<script src="' . $this->fileUrlGenerator
      ->generateString('core/misc/drupal.js'), $rendered_js, 'The JS asset of the direct dependency (core/drupal) of common_test/js-header appears in the header.');
    $this->assertStringContainsString('<script src="' . $this->fileUrlGenerator
      ->generateString('core/misc/drupalSettingsLoader.js'), $rendered_js, 'The JS asset of the indirect dependency (core/drupalSettings) of common_test/js-header appears in the header.');
  }
  
  /**
   * Tests that for assets with cache = FALSE, Drupal sets preprocess = FALSE.
   */
  public function testNoCache() : void {
    $build['#attached']['library'][] = 'common_test/no-cache';
    $assets = AttachedAssets::createFromRenderArray($build);
    $js = $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $this->assertFalse($js['core/modules/system/tests/modules/common_test/no_cache.js']['preprocess'], 'Setting cache to FALSE sets preprocess to FALSE when adding JavaScript.');
  }
  
  /**
   * Tests JavaScript versioning.
   */
  public function testVersionQueryString() : void {
    $build['#attached']['library'][] = 'core/once';
    $assets = AttachedAssets::createFromRenderArray($build);
    $js = $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $js_render_array = \Drupal::service('asset.js.collection_renderer')->render($js);
    $rendered_js = (string) $this->renderer
      ->renderInIsolation($js_render_array);
    $this->assertStringContainsString('core/assets/vendor/once/once.min.js?v=1.0.1', $rendered_js, 'JavaScript version identifiers correctly appended to URLs');
  }
  
  /**
   * Tests JavaScript and CSS asset ordering.
   */
  public function testRenderOrder() : void {
    $build['#attached']['library'][] = 'common_test/order';
    $assets = AttachedAssets::createFromRenderArray($build);
    // Construct the expected result from the regex.
    $expected_order_js = [
      "-8_1",
      "-8_2",
      "-8_3",
      "-8_4",
      // The external script.
"-5_1",
      "-3_1",
      "-3_2",
      "0_1",
      "0_2",
      "0_3",
    ];
    // Retrieve the rendered JavaScript and test against the regex.
    $js = $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $js_render_array = \Drupal::service('asset.js.collection_renderer')->render($js);
    $rendered_js = (string) $this->renderer
      ->renderInIsolation($js_render_array);
    $matches = [];
    if (preg_match_all('/weight_([-0-9]+_[0-9]+)/', $rendered_js, $matches)) {
      $result = $matches[1];
    }
    else {
      $result = [];
    }
    $this->assertSame($expected_order_js, $result, 'JavaScript is added in the expected weight order.');
    // Construct the expected result from the regex.
    $expected_order_css = [
      // Base.
'base_weight_-101_1',
      'base_weight_-8_1',
      'layout_weight_-101_1',
      'base_weight_0_1',
      'base_weight_0_2',
      // Layout.
'layout_weight_-8_1',
      'component_weight_-101_1',
      'layout_weight_0_1',
      'layout_weight_0_2',
      // Component.
'component_weight_-8_1',
      'state_weight_-101_1',
      'component_weight_0_1',
      'component_weight_0_2',
      // State.
'state_weight_-8_1',
      'theme_weight_-101_1',
      'state_weight_0_1',
      'state_weight_0_2',
      // Theme.
'theme_weight_-8_1',
      'theme_weight_0_1',
      'theme_weight_0_2',
    ];
    // Retrieve the rendered CSS and test against the regex.
    $css = $this->assetResolver
      ->getCssAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage());
    $css_render_array = \Drupal::service('asset.css.collection_renderer')->render($css);
    $rendered_css = (string) $this->renderer
      ->renderInIsolation($css_render_array);
    $matches = [];
    if (preg_match_all('/([a-z]+)_weight_([-0-9]+_[0-9]+)/', $rendered_css, $matches)) {
      $result = $matches[0];
    }
    else {
      $result = [];
    }
    $this->assertSame($expected_order_css, $result, 'CSS is added in the expected weight order.');
  }
  
  /**
   * Tests rendering the JavaScript with a file's weight above jQuery's.
   */
  public function testRenderDifferentWeight() : void {
    // If a library contains assets A and B, and A is listed first, then B can
    // still make itself appear first by defining a lower weight.
    $build['#attached']['library'][] = 'core/jquery';
    $build['#attached']['library'][] = 'common_test/weight';
    $assets = AttachedAssets::createFromRenderArray($build);
    $js = $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $js_render_array = \Drupal::service('asset.js.collection_renderer')->render($js);
    $rendered_js = (string) $this->renderer
      ->renderInIsolation($js_render_array);
    // Verify that lighter CSS assets are rendered first.
    $this->assertLessThan(strpos($rendered_js, 'first.js'), strpos($rendered_js, 'lighter.css'));
    // Verify that lighter JavaScript assets are rendered first.
    $this->assertLessThan(strpos($rendered_js, 'first.js'), strpos($rendered_js, 'lighter.js'));
    // Verify that a JavaScript file is rendered before jQuery.
    $this->assertLessThan(strpos($rendered_js, 'core/assets/vendor/jquery/jquery.min.js'), strpos($rendered_js, 'before-jquery.js'));
  }
  
  /**
   * Tests altering a JavaScript's weight via hook_js_alter().
   *
   * @see common_test_js_alter()
   */
  public function testAlter() : void {
    // Add both tableselect.js and alter.js.
    $build['#attached']['library'][] = 'core/drupal.tableselect';
    $build['#attached']['library'][] = 'common_test/hook_js_alter';
    $assets = AttachedAssets::createFromRenderArray($build);
    // Render the JavaScript, testing if alter.js was altered to be before
    // tableselect.js. See common_test_js_alter() to see where this alteration
    // takes place.
    $js = $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $js_render_array = \Drupal::service('asset.js.collection_renderer')->render($js);
    $rendered_js = (string) $this->renderer
      ->renderInIsolation($js_render_array);
    // Verify that JavaScript weight is correctly altered by the alter hook.
    $this->assertLessThan(strpos($rendered_js, 'core/misc/tableselect.js'), strpos($rendered_js, 'alter.js'));
  }
  
  /**
   * Adds a JavaScript library to the page and alters it.
   *
   * @see common_test_library_info_alter()
   */
  public function testLibraryAlter() : void {
    // Verify that common_test altered the title of loadjs.
    /** @var \Drupal\Core\Asset\LibraryDiscoveryInterface $library_discovery */
    $library_discovery = \Drupal::service('library.discovery');
    $library = $library_discovery->getLibraryByName('core', 'loadjs');
    $this->assertEquals('0.0', $library['version'], 'Registered libraries were altered.');
    // common_test_library_info_alter() also added a dependency on jQuery Form.
    $build['#attached']['library'][] = 'core/loadjs';
    $assets = AttachedAssets::createFromRenderArray($build);
    $js = $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $js_render_array = \Drupal::service('asset.js.collection_renderer')->render($js);
    $rendered_js = (string) $this->renderer
      ->renderInIsolation($js_render_array);
    $this->assertStringContainsString('core/misc/jquery.form.js', (string) $rendered_js, 'Altered library dependencies are added to the page.');
  }
  
  /**
   * Dynamically defines an asset library and alters it.
   */
  public function testDynamicLibrary() : void {
    /** @var \Drupal\Core\Asset\LibraryDiscoveryInterface $library_discovery */
    $library_discovery = \Drupal::service('library.discovery');
    // Retrieve a dynamic library definition.
    // @see common_test_library_info_build()
    \Drupal::state()->set('common_test.library_info_build_test', TRUE);
    $library_discovery->clear();
    $dynamic_library = $library_discovery->getLibraryByName('common_test', 'dynamic_library');
    $this->assertIsArray($dynamic_library);
    $this->assertArrayHasKey('version', $dynamic_library);
    $this->assertSame('1.0', $dynamic_library['version']);
    // Make sure the dynamic library definition could be altered.
    // @see common_test_library_info_alter()
    $this->assertArrayHasKey('dependencies', $dynamic_library);
    $this->assertSame([
      'core/jquery',
    ], $dynamic_library['dependencies']);
  }
  
  /**
   * Tests that multiple modules can implement libraries with the same name.
   *
   * @see common_test.library.yml
   */
  public function testLibraryNameConflicts() : void {
    /** @var \Drupal\Core\Asset\LibraryDiscoveryInterface $library_discovery */
    $library_discovery = \Drupal::service('library.discovery');
    $loadjs = $library_discovery->getLibraryByName('common_test', 'loadjs');
    $this->assertEquals('0.1', $loadjs['version'], 'Alternative libraries can be added to the page.');
  }
  
  /**
   * Tests JavaScript files that have query strings attached get added right.
   */
  public function testAddJsFileWithQueryString() : void {
    $build['#attached']['library'][] = 'common_test/querystring';
    $assets = AttachedAssets::createFromRenderArray($build);
    $css = $this->assetResolver
      ->getCssAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage());
    $js = $this->assetResolver
      ->getJsAssets($assets, FALSE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $this->assertArrayHasKey('core/modules/system/tests/modules/common_test/querystring.css?arg1=value1&arg2=value2', $css);
    $this->assertArrayHasKey('core/modules/system/tests/modules/common_test/querystring.js?arg1=value1&arg2=value2', $js);
    $css_render_array = \Drupal::service('asset.css.collection_renderer')->render($css);
    $rendered_css = (string) $this->renderer
      ->renderInIsolation($css_render_array);
    $js_render_array = \Drupal::service('asset.js.collection_renderer')->render($js);
    $rendered_js = (string) $this->renderer
      ->renderInIsolation($js_render_array);
    $query_string = $this->container
      ->get('asset.query_string')
      ->get();
    $this->assertStringContainsString('<link rel="stylesheet" media="all" href="' . str_replace('&', '&amp;', $this->fileUrlGenerator
      ->generateString('core/modules/system/tests/modules/common_test/querystring.css?arg1=value1&arg2=value2')) . '&amp;' . $query_string . '" />', $rendered_css, 'CSS file with query string gets version query string correctly appended..');
    $this->assertStringContainsString('<script src="' . str_replace('&', '&amp;', $this->fileUrlGenerator
      ->generateString('core/modules/system/tests/modules/common_test/querystring.js?arg1=value1&arg2=value2')) . '&amp;' . $query_string . '"></script>', $rendered_js, 'JavaScript file with query string gets version query string correctly appended.');
  }
  
  /**
   * Test settings can be loaded even when libraries are not.
   */
  public function testAttachedSettingsWithoutLibraries() : void {
    $assets = new AttachedAssets();
    // First test with no libraries will return no settings.
    $assets->setSettings([
      'test' => 'foo',
    ]);
    $js = $this->assetResolver
      ->getJsAssets($assets, TRUE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $this->assertArrayNotHasKey('drupalSettings', $js);
    // Second test with a warm cache.
    $js = $this->assetResolver
      ->getJsAssets($assets, TRUE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $this->assertArrayNotHasKey('drupalSettings', $js);
    // Now test with different settings when drupalSettings is already loaded.
    $assets->setSettings([
      'test' => 'bar',
    ]);
    $assets->setAlreadyLoadedLibraries([
      'core/drupalSettings',
    ]);
    $js = $this->assetResolver
      ->getJsAssets($assets, TRUE, \Drupal::languageManager()->getCurrentLanguage())[1];
    $this->assertSame('bar', $js['drupalSettings']['data']['test']);
  }

}