PluginAlterTest.php

<?php

declare (strict_types=1);
namespace Drupal\KernelTests\Core\Render\Element;

use Drupal\KernelTests\KernelTestBase;

/**
 * @group Render
 */
class PluginAlterTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'element_info_test',
    ];
    
    /**
     * Tests hook_element_plugin_alter().
     */
    public function testPluginAlter() : void {
        $info_manager = $this->container
            ->get('plugin.manager.element_info');
        $this->assertArrayHasKey('weight', $info_manager->getDefinitions());
        // @see element_info_test_element_plugin_alter()
        $this->container
            ->get('state')
            ->set('hook_element_plugin_alter:remove_weight', TRUE);
        // The definition will be cached.
        $this->assertArrayHasKey('weight', $info_manager->getDefinitions());
        // Clearing the caches removes the definition.
        $info_manager->clearCachedDefinitions();
        $this->assertArrayNotHasKey('weight', $info_manager->getDefinitions());
    }

}