class MaintenanceThemeUpdateRegistryTest

class MaintenanceThemeUpdateRegistryTest extends BrowserTestBase {
    use RequirementsPageTrait;
    
    /**
     * {@inheritdoc}
     */
    protected $profile = 'theme_test_profile';
    
    /**
     * {@inheritdoc}
     */
    protected function prepareSettings() {
        parent::prepareSettings();
        $this->writeSettings([
            'settings' => [
                'maintenance_theme' => (object) [
                    'value' => 'test_theme_updates',
                    'required' => TRUE,
                ],
            ],
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function prepareEnvironment() {
        parent::prepareEnvironment();
        $info = [
            'type' => 'profile',
            'core_version_requirement' => '*',
            'name' => 'Theme test profile',
            'themes' => [
                'test_theme_updates',
            ],
        ];
        // Create an install profile that uses the test theme.
        $path = $this->siteDirectory . '/profiles/theme_test_profile';
        mkdir($path, 0777, TRUE);
        file_put_contents("{$path}/theme_test_profile.info.yml", Yaml::encode($info));
        // Create a system.theme.yml file for the profile so the test theme is used.
        $path = $this->siteDirectory . '/profiles/theme_test_profile/config/install';
        mkdir($path, 0777, TRUE);
        $theme_config = Yaml::decode(file_get_contents(\Drupal::moduleHandler()->getModule('system')
            ->getPath() . '/config/install/system.theme.yml'));
        $theme_config['default'] = 'test_theme_updates';
        file_put_contents("{$path}/system.theme.yml", Yaml::encode($theme_config));
    }
    
    /**
     * Tests that after installing the profile there are no outstanding updates.
     */
    public function testMaintenanceThemeUpdateRegistration() {
        $this->drupalLogin($this->rootUser);
        $this->drupalGet('update.php/selection');
        $this->updateRequirementsProblem();
        $this->drupalGet('update.php/selection');
        $this->assertSession()
            ->pageTextContains('No pending updates.');
    }

}