NodeViewLanguageTest.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\node\Functional;

use Drupal\language\Entity\ConfigurableLanguage;

/**
 * Tests the node language extra field display.
 *
 * @group node
 */
class NodeViewLanguageTest extends NodeTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'node',
    'datetime',
    'language',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * Tests the language extra field display.
   */
  public function testViewLanguage() : void {
    // Add Spanish language.
    ConfigurableLanguage::createFromLangcode('es')->save();
    // Set language field visible.
    \Drupal::service('entity_display.repository')->getViewDisplay('node', 'page', 'full')
      ->setComponent('langcode')
      ->save();
    // Create a node in Spanish.
    $node = $this->drupalCreateNode([
      'langcode' => 'es',
    ]);
    $this->drupalGet($node->toUrl());
    $this->assertSession()
      ->pageTextContains('Spanish');
  }

}