ActiveTheme example

$base_active_themes = [];
    foreach ($base_themes as $base_theme) {
      $base_active_themes[$base_theme->getName()] = $base_theme;
    }

    $values['base_theme_extensions'] = $base_active_themes;
    if (!empty($theme->info['regions'])) {
      $values['regions'] = $theme->info['regions'];
    }

    return new ActiveTheme($values);
  }

  /** * Gets all extensions. * * @return array */
  protected function getExtensions() {
    if (!isset($this->extensions)) {
      $this->extensions = array_merge($this->moduleHandler->getModuleList(), $this->themeHandler->listInfo());
    }
    

  protected function tearDown(): void {
    parent::tearDown();
    static::$functions = [];
  }

  /** * Tests getting the theme registry defined by a module. */
  public function testGetRegistryForModule() {
    $test_theme = new ActiveTheme([
      'name' => 'test_theme',
      'path' => 'core/modules/system/tests/themes/test_theme/test_theme.info.yml',
      'engine' => 'twig',
      'owner' => 'twig',
      'libraries_override' => [],
      'libraries_extend' => [],
      'libraries' => [],
      'extension' => '.twig',
      'base_theme_extensions' => [],
    ]);

    

->willReturn([
        '#theme' => 'page',
      ]);

    $element_info = $this->getMockBuilder('Drupal\Core\Render\ElementInfoManager')
      ->setConstructorArgs([new \ArrayObject(), $this->cache, $this->cacheTagsInvalidator, $this->moduleHandler, $this->themeManager])
      ->onlyMethods(['getDefinitions', 'createInstance'])
      ->getMock();

    $this->themeManager->expects($this->any())
      ->method('getActiveTheme')
      ->willReturn(new ActiveTheme(['name' => 'test']));

    $element_info->expects($this->once())
      ->method('createInstance')
      ->with('page')
      ->willReturn($plugin);
    $element_info->expects($this->once())
      ->method('getDefinitions')
      ->willReturn([
        'page' => ['class' => 'TestElementPlugin'],
      ]);