_testQueries example

protected function setUp(): void {
    parent::setUp();
    $this->installSchema('search', ['search_index', 'search_dataset', 'search_total']);
    $this->installConfig(['search']);
  }

  /** * Tests search indexing. */
  public function testMatching() {
    $this->_setup();
    $this->_testQueries();
  }

  /** * Set up a small index of items to test against. */
  public function _setup() {
    $this->config('search.settings')->set('index.minimum_word_size', 3)->save();

    $search_index = \Drupal::service('search.index');
    assert($search_index instanceof SearchIndexInterface);
    for ($i = 1; $i <= 7; ++$i) {