class TaxonomyTermPagerTest

class TaxonomyTermPagerTest extends TaxonomyTestBase {
  
  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'taxonomy',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * Vocabulary for testing.
   *
   * @var \Drupal\taxonomy\VocabularyInterface
   */
  protected $vocabulary;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->drupalLogin($this->drupalCreateUser([
      'administer taxonomy',
      'bypass node access',
    ]));
    $this->vocabulary = $this->createVocabulary();
  }
  
  /**
   * Tests that the pager is displayed properly on the term overview page.
   */
  public function testTaxonomyTermOverviewPager() {
    // Set limit to 3 terms per page.
    $this->config('taxonomy.settings')
      ->set('terms_per_page_admin', '3')
      ->save();
    // Create 3 terms.
    for ($x = 1; $x <= 3; $x++) {
      $this->createTerm($this->vocabulary);
    }
    // Get Page 1.
    $this->drupalGet('admin/structure/taxonomy/manage/' . $this->vocabulary
      ->id() . '/overview');
    // Pager should not be visible.
    $this->assertSession()
      ->responseNotMatches('|<nav class="pager" [^>]*>|');
    // Create 3 more terms to show pager.
    for ($x = 1; $x <= 3; $x++) {
      $this->createTerm($this->vocabulary);
    }
    // Ensure that pager is visible on page 1.
    $this->drupalGet('admin/structure/taxonomy/manage/' . $this->vocabulary
      ->id() . '/overview');
    $this->assertSession()
      ->responseMatches('|<nav class="pager" [^>]*>|');
    // Ensure that pager is visible on page 2.
    $this->drupalGet('admin/structure/taxonomy/manage/' . $this->vocabulary
      ->id() . '/overview', [
      'query' => [
        'page' => 1,
      ],
    ]);
    $this->assertSession()
      ->responseMatches('|<nav class="pager" [^>]*>|');
  }

}