class ThemeExtensionListTest

class ThemeExtensionListTest extends KernelTestBase {
  
  /**
   * @covers ::getList
   */
  public function testGetlist() {
    \Drupal::configFactory()->getEditable('core.extension')
      ->set('module.testing', 1000)
      ->set('theme.test_theme', 0)
      ->save();
    // The installation profile is provided by a container parameter.
    // Saving the configuration doesn't automatically trigger invalidation
    $this->container
      ->get('kernel')
      ->rebuildContainer();
    /** @var \Drupal\Core\Extension\ThemeExtensionList $theme_extension_list */
    $theme_extension_list = \Drupal::service('extension.list.theme');
    $extensions = $theme_extension_list->getList();
    $this->assertArrayHasKey('test_theme', $extensions);
  }
  
  /**
   * Tests that themes have an empty default version set.
   */
  public function testThemeWithoutVersion() {
    $theme = \Drupal::service('extension.list.theme')->get('test_theme_settings_features');
    $this->assertNull($theme->info['version']);
  }

}