LayoutPluginManagerTest.php

<?php

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

use Drupal\Core\Layout\LayoutDefinition;
use Drupal\KernelTests\KernelTestBase;

/**
 * @coversDefaultClass \Drupal\Core\Layout\LayoutPluginManager
 * @group Layout
 */
class LayoutPluginManagerTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'layout_discovery',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->container
            ->get('theme_installer')
            ->install([
            'test_child_theme',
        ]);
        $this->activateTheme('test_child_theme');
    }
    
    /**
     * Tests that layout plugins are correctly overridden.
     */
    public function testPluginOverride() : void {
        
        /** @var \Drupal\Core\Layout\LayoutPluginManagerInterface $layouts_manager */
        $layouts_manager = $this->container
            ->get('plugin.manager.core.layout');
        $definitions = $layouts_manager->getDefinitions();
        $this->assertInstanceOf(LayoutDefinition::class, $definitions['theme_parent_provided_layout']);
        $this->assertSame('Child', $definitions['theme_parent_provided_layout']->getLabel()
            ->render());
    }
    
    /**
     * Activates a specified theme.
     *
     * Installs the theme if not already installed and makes it the active theme.
     *
     * @param string $theme_name
     *   The name of the theme to be activated.
     */
    protected function activateTheme(string $theme_name) : void {
        $this->container
            ->get('theme_installer')
            ->install([
            $theme_name,
        ]);
        
        /** @var \Drupal\Core\Theme\ThemeInitializationInterface $theme_initializer */
        $theme_initializer = $this->container
            ->get('theme.initialization');
        
        /** @var \Drupal\Core\Theme\ThemeManagerInterface $theme_manager */
        $theme_manager = $this->container
            ->get('theme.manager');
        $theme_manager->setActiveTheme($theme_initializer->getActiveThemeByName($theme_name));
        $this->assertSame($theme_name, $theme_manager->getActiveTheme()
            ->getName());
    }

}