Issue #3414589 by Spokje: Convert SearchSetLocaleTest into a Kernel test

<?php

namespace Drupal\Tests\search\Functional;

namespace Drupal\Tests\search\Kernel;

use Drupal\Tests\BrowserTestBase;

use Drupal\Core\Datetime\Entity\DateFormat;

use Drupal\KernelTests\KernelTestBase;

use Drupal\node\Plugin\Search\NodeSearch;

use Drupal\Tests\node\Traits\ContentTypeCreationTrait;

use Drupal\Tests\node\Traits\NodeCreationTrait;

use Drupal\Tests\user\Traits\UserCreationTrait;

/**

 * Tests that search works with numeric locale settings.

 *

 * @group search

 */

class SearchSetLocaleTest extends BrowserTestBase {

class SearchSetLocaleTest extends KernelTestBase {

  /**

   * {@inheritdoc}

   */

  protected static $modules = ['comment', 'node', 'search'];

  use ContentTypeCreationTrait;

  use NodeCreationTrait;

  use UserCreationTrait;

  /**

   * {@inheritdoc}

   */

  protected $defaultTheme = 'stark';

  protected static $modules = [

    'field',

    'filter',

    'node',

    'search',

    'system',

    'text',

    'user',

  ];

  /**

   * A node search plugin instance.

   *

   * @var \Drupal\search\Plugin\SearchInterface

   */

  protected $nodeSearchPlugin;

  protected NodeSearch $nodeSearchPlugin;

  /**

   * {@inheritdoc}

  protected function setUp(): void {

    parent::setUp();

    $this->drupalCreateContentType(['type' => 'page', 'name' => 'Basic page']);

    $this->installSchema('node', ['node_access']);

    $this->installSchema('search', ['search_index', 'search_dataset', 'search_total']);

    $this->installEntitySchema('node');

    $this->installEntitySchema('user');

    $this->installConfig(['filter', 'node', 'search']);

    // Create the anonymous user account and set it as current user.

    $this->setUpCurrentUser(['uid' => 0]);

    // Create a node type.

    $this->createContentType([

      'type' => 'page',

      'name' => 'Basic page',

    ]);

    // Create a plugin instance.

    $this->nodeSearchPlugin = $this->container->get('plugin.manager.search')->createInstance('node_search');

    // Create a node with a very simple body.

    $this->drupalCreateNode(['body' => [['value' => 'tapir']]]);

    $this->createNode(

      [

        'body' => [

          [

            'value' => 'tapir',

          ],

        ],

        'uid' => 0,

      ]

    );

    // Create the fallback date format.

    DateFormat::create([

      'id' => 'fallback',

      'label' => 'Fallback date format',

      'pattern' => 'D, m/d/Y - H:i',

      'locked' => TRUE,

    ])->save();

    // Update the search index.

    $this->nodeSearchPlugin->updateIndex();

  }

  /**

   * Verify that search works with a numeric locale set.

   */

  public function testSearchWithNumericLocale() {

  public function testSearchWithNumericLocale(): void {

    // French decimal point is comma.

    setlocale(LC_NUMERIC, 'fr_FR');

    $this->nodeSearchPlugin->setSearch('tapir', [], []);