ElementInfoIntegrationTest.php

<?php

namespace Drupal\KernelTests\Core\Render;

use Drupal\KernelTests\KernelTestBase;

/**
 * Tests the element info.
 *
 * @group Render
 */
class ElementInfoIntegrationTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        $this->container
            ->get('theme_installer')
            ->install([
            'test_theme',
            'classy',
        ]);
    }
    
    /**
     * Ensures that the element info can be altered by themes.
     */
    public function testElementInfoByTheme() {
        
        /** @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');
        
        /** @var \Drupal\Core\Render\ElementInfoManagerInterface $element_info */
        $element_info = $this->container
            ->get('plugin.manager.element_info');
        $theme_manager->setActiveTheme($theme_initializer->getActiveThemeByName('classy'));
        $this->assertEqual(60, $element_info->getInfo('textfield')['#size']);
        $theme_manager->setActiveTheme($theme_initializer->getActiveThemeByName('test_theme'));
        $this->assertEqual(40, $element_info->getInfo('textfield')['#size']);
    }

}