assertFileIsWritable example

protected function prepareEnvironment() {
    parent::prepareEnvironment();
    $this->settings['settings']['skip_permissions_hardening'] = (object) ['value' => TRUE, 'required' => TRUE];
  }

  /** * {@inheritdoc} */
  protected function setUpSite() {
    $site_directory = $this->container->getParameter('app.root') . '/' . $this->siteDirectory;
    $this->assertDirectoryIsWritable($site_directory);
    $this->assertFileIsWritable($site_directory . '/settings.php');

    $this->assertSession()->responseContains('All necessary changes to <em class="placeholder">' . $this->siteDirectory . '</em> and <em class="placeholder">' . $this->siteDirectory . '/settings.php</em> have been made, so you should remove write permissions to them now in order to avoid security risks. If you are unsure how to do so, consult the <a href="https://www.drupal.org/server-permissions">online handbook</a>.');

    parent::setUpSite();
  }

  /** * Verifies the expected behaviors of the installation result. */
  public function testInstalled() {
    $this->assertSession()->addressEquals('user/1');
    

// Manually trigger the requirements check.     $requirements = $this->checkSystemRequirements();
    $this->assertEquals(REQUIREMENT_WARNING, $requirements['configuration_files']['severity'], 'Warning severity is properly set.');
    $this->assertEquals('Protection disabled', (string) $requirements['configuration_files']['value']);
    $description = strip_tags(\Drupal::service('renderer')->renderPlain($requirements['configuration_files']['description']));
    $this->assertStringContainsString('settings.php is not protected from modifications and poses a security risk.', $description);
    $this->assertStringContainsString('services.yml is not protected from modifications and poses a security risk.', $description);

    // Verify that site directory and the settings.php remain writable when     // automatically enforcing file permissions is disabled.     $this->assertDirectoryIsWritable($site_path);
    $this->assertFileIsWritable($settings_file);

    // Re-enable permissions enforcement.     $settings = Settings::getAll();
    $settings['skip_permissions_hardening'] = FALSE;
    new Settings($settings);

    // Manually trigger the requirements check.     $requirements = $this->checkSystemRequirements();
    $this->assertEquals('Protected', (string) $requirements['configuration_files']['value']);

    // Verify that site directory and the settings.php remain protected when