class UserLanguageTest

class UserLanguageTest extends BrowserTestBase {
  
  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'user',
    'language',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * Tests if user can change their default language.
   */
  public function testUserLanguageConfiguration() {
    // User to add and remove language.
    $admin_user = $this->drupalCreateUser([
      'administer languages',
      'access administration pages',
    ]);
    // User to change their default language.
    $web_user = $this->drupalCreateUser();
    // Add custom language.
    $this->drupalLogin($admin_user);
    // Code for the language.
    $langcode = 'xx';
    // The English name for the language.
    $name = $this->randomMachineName(16);
    $edit = [
      'predefined_langcode' => 'custom',
      'langcode' => $langcode,
      'label' => $name,
      'direction' => LanguageInterface::DIRECTION_LTR,
    ];
    $this->drupalGet('admin/config/regional/language/add');
    $this->submitForm($edit, 'Add custom language');
    $this->drupalLogout();
    // Log in as normal user and edit account settings.
    $this->drupalLogin($web_user);
    $path = 'user/' . $web_user->id() . '/edit';
    $this->drupalGet($path);
    // Ensure language settings widget is available.
    $this->assertSession()
      ->pageTextContains('Language');
    // Ensure custom language is present.
    $this->assertSession()
      ->pageTextContains($name);
    // Switch to our custom language.
    $edit = [
      'preferred_langcode' => $langcode,
    ];
    $this->drupalGet($path);
    $this->submitForm($edit, 'Save');
    // Ensure form was submitted successfully.
    $this->assertSession()
      ->pageTextContains('The changes have been saved.');
    // Check if language was changed.
    $this->assertTrue($this->assertSession()
      ->optionExists('edit-preferred-langcode', $langcode)
      ->isSelected());
    $this->drupalLogout();
  }

}