AuthZeroService snippet for writing Unit Test cases

AuthZeroService.php

<?php

namespace Drupal\authzero\Service;

use Drupal\Core\Config\ConfigFactoryInterface;

/**
 * Set of utility functions.
 */
class AuthZeroService {

  /**
   * The authZero Settings.
   *
   * @var array
   */
  protected $auth0;

  /**
   * Defining constructor for Auth0.
   *
   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
   *   The config factory object.
   */
  public function __construct(ConfigFactoryInterface $config_factory) {
    $this->auth0 = $config_factory->get('authzero.settings');
  }

  /**
   * User logout Link, for auth0.
   *
   * @param string|null $error
   *   The error messages.
   *
   * @return string
   *   The logout link.
   */
  public function getLogoutLink(string $error = NULL): string {
    return sprintf(
      'https://%s/v2/logout?client_id=%s&federated=true&returnTo=%s?error_description=%s',
      $this->auth0->get('domain'),
      $this->auth0->get('client_id'),
      \Drupal::request()->getSchemeAndHttpHost() . '/auth0/login',
      $error
    );
  }

}