class ThemeUpdateTest

class ThemeUpdateTest extends BrowserTestBase {
  use UpdatePathTestTrait;
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'starterkit_theme';
  
  /**
   * Ensures preprocess functions run even for suggestion implementations.
   *
   * The theme hook used by this test has its base preprocess function in a
   * separate file, so this test also ensures that the file is correctly loaded
   * when needed.
   */
  public function testThemeUpdates() {
    \Drupal::service('module_installer')->install([
      'test_module_required_by_theme',
    ]);
    $this->rebuildAll();
    \Drupal::state()->set('test_theme_depending_on_modules.system_info_alter', [
      'dependencies' => [
        'test_module_required_by_theme',
        'stark',
      ],
    ]);
    \Drupal::service('theme_installer')->install([
      'test_theme_depending_on_modules',
    ]);
    $this->assertTrue(\Drupal::service('theme_handler')->themeExists('test_theme_depending_on_modules'), 'test_theme_depending_on_modules theme installed');
    \Drupal::state()->set('test_theme_depending_on_modules.system_info_alter', FALSE);
    \Drupal::state()->set('test_theme_depending_on_modules.post_update', TRUE);
    $this->assertFalse(\Drupal::moduleHandler()->moduleExists('test_another_module_required_by_theme'));
    $this->runUpdates();
    $this->assertTrue(\Drupal::moduleHandler()->moduleExists('test_another_module_required_by_theme'));
    $this->assertSession()
      ->addressEquals('update.php/results');
    $this->assertSession()
      ->responseContains('test_theme_depending_on_modules theme');
    $this->assertSession()
      ->responseContains('Post update message from theme post update function');
  }
  
  /**
   * {@inheritdoc}
   */
  protected function doSelectionTest() {
    // Ensure that the theme's post update appears as expected.
    $this->assertSession()
      ->responseContains('test_theme_depending_on_modules theme');
    $this->assertSession()
      ->responseContains('Install a dependent module.');
  }

}