PagerExampleTest.php

<?php

namespace Drupal\Tests\pager_example\Functional;

use Drupal\Tests\examples\Functional\ExamplesBrowserTestBase;

/**
 * Tests paging.
 *
 * @group pager_example
 * @group examples
 */
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());
    }

}