DevelWebAssertHelper.php

<?php

namespace Drupal\Tests\devel\Functional;

use Drupal\Core\Url;

/**
 * Provides convenience methods for assertions in browser tests.
 */
trait DevelWebAssertHelper {
    
    /**
     * Asserts local tasks in the page output.
     *
     * @param array $routes
     *   A list of expected local tasks, prepared as an array of route names and
     *   their associated route parameters, to assert on the page (in the given
     *   order).
     * @param int $level
     *   (optional) The local tasks level to assert; 0 for primary, 1 for
     *   secondary. Defaults to 0.
     */
    protected function assertLocalTasks(array $routes, $level = 0) {
        $tab_label = $level == 0 ? 'Primary tabs' : 'Secondary tabs';
        $elements = $this->xpath('//h2[text()="' . $tab_label . '"]/following-sibling::ul//a');
        $this->assertNotEmpty($elements, 'Local tasks not found.');
        foreach ($routes as $index => $route_info) {
            [
                $route_name,
                $route_parameters,
            ] = $route_info;
            $expected = Url::fromRoute($route_name, $route_parameters)->toString();
            $this->assertEquals($expected, $elements[$index]->getAttribute('href'));
        }
    }

}