class PagerExampleTest

class PagerExampleTest extends ExamplesBrowserTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'pager_example',
    'node',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    // Log in a user to prevent caching from affecting the results.
    $normalUser = $this->drupalCreateUser();
    $this->drupalLogin($normalUser);
  }
  
  /**
   * Confirms nodes paging works correctly on page "pager_example".
   */
  public function testPagerExamplePage() {
    $assert = $this->assertSession();
    $nodes = [];
    $nodes[] = $this->drupalCreateNode();
    $this->drupalGet('examples/pager-example');
    $assert->linkNotExists('Next');
    $assert->linkNotExists('Previous');
    // Create 5 new nodes.
    for ($i = 1; $i <= 5; $i++) {
      $nodes[] = $this->drupalCreateNode([
        'title' => "Node number {$i}",
      ]);
    }
    // The pager pages are cached, so flush to see the 5 more nodes.
    drupal_flush_all_caches();
    // Check 'Next' link on first page.
    $this->drupalGet('examples/pager-example');
    $assert->statusCodeEquals(200);
    $assert->linkByHrefExists('?page=1');
    $assert->pageTextContains($nodes[5]->getTitle());
    // Check the last page.
    $this->drupalGet('examples/pager-example', [
      'query' => [
        'page' => 2,
      ],
    ]);
    $assert->statusCodeEquals(200);
    $assert->linkNotExists('Next');
    $assert->linkByHrefExists('?page=1');
    $assert->pageTextContains($nodes[1]->getTitle());
  }

}