ThemeTest.php

<?php

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


/**
 * Verifies that various taxonomy pages use the expected theme.
 *
 * @group taxonomy
 */
class ThemeTest extends TaxonomyTestBase {

  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';

  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();

    // Make sure we are using distinct default and administrative themes for
    // the duration of these tests.
    \Drupal::service('theme_installer')
      ->install([
      'olivero',
      'claro',
    ]);
    $this
      ->config('system.theme')
      ->set('default', 'olivero')
      ->set('admin', 'claro')
      ->save();

    // Create and log in as a user who has permission to add and edit taxonomy
    // terms and view the administrative theme.
    $admin_user = $this
      ->drupalCreateUser([
      'administer taxonomy',
      'view the administration theme',
    ]);
    $this
      ->drupalLogin($admin_user);
  }

  /**
   * Tests the theme used when adding, viewing and editing taxonomy terms.
   */
  public function testTaxonomyTermThemes() {

    // Adding a term to a vocabulary is considered an administrative action and
    // should use the administrative theme.
    $vocabulary = $this
      ->createVocabulary();
    $this
      ->drupalGet('admin/structure/taxonomy/manage/' . $vocabulary
      ->id() . '/add');

    // Check that the administrative theme's CSS appears on the page for adding
    // a taxonomy term.
    $this
      ->assertSession()
      ->responseContains('claro/css/base/elements.css');

    // Viewing a taxonomy term should use the default theme.
    $term = $this
      ->createTerm($vocabulary);
    $this
      ->drupalGet('taxonomy/term/' . $term
      ->id());

    // Check that the default theme's CSS appears on the page for viewing
    // a taxonomy term.
    $this
      ->assertSession()
      ->responseContains('olivero/css/base/base.css');

    // Editing a taxonomy term should use the same theme as adding one.
    $this
      ->drupalGet('taxonomy/term/' . $term
      ->id() . '/edit');

    // Check that the administrative theme's CSS appears on the page for editing
    // a taxonomy term.
    $this
      ->assertSession()
      ->responseContains('claro/css/base/elements.css');
  }

}