UserFieldsTest.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\user\Kernel;

use Drupal\user\Entity\User;
use Drupal\KernelTests\KernelTestBase;

/**
 * Tests available user fields in twig.
 *
 * @group user
 */
class UserFieldsTest extends KernelTestBase {

  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'user',
    'system',
  ];

  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this
      ->installEntitySchema('user');

    // Set up a test theme that prints the user's mail field.
    \Drupal::service('theme_installer')
      ->install([
      'user_test_theme',
    ]);
    \Drupal::theme()
      ->setActiveTheme(\Drupal::service('theme.initialization')
      ->initTheme('user_test_theme'));

    // Clear the theme registry.
    $this->container
      ->set('theme.registry', NULL);
  }

  /**
   * Tests account's available fields.
   */
  public function testUserFields() {

    // Create the user to test the user fields.
    $user = User::create([
      'name' => 'foobar',
      'mail' => 'foobar@example.com',
    ]);
    $build = \Drupal::entityTypeManager()
      ->getViewBuilder('user')
      ->view($user);
    $output = \Drupal::service('renderer')
      ->renderRoot($build);
    $this
      ->setRawContent($output);
    $userEmail = $user
      ->getEmail();
    $this
      ->assertText($userEmail, "User's mail field is found in the twig template");
  }

}