ThemeExtensionListTest.php

<?php

namespace Drupal\KernelTests\Core\Extension;

use Drupal\KernelTests\KernelTestBase;

/**
 * @coversDefaultClass \Drupal\Core\Extension\ThemeExtensionList
 * @group Extension
 */
class ThemeExtensionListTest extends KernelTestBase {
    
    /**
     * @covers ::getList
     */
    public function testGetlist() {
        \Drupal::configFactory()->getEditable('core.extension')
            ->set('module.testing', 1000)
            ->set('theme.test_theme', 0)
            ->save();
        // The installation profile is provided by a container parameter.
        // Saving the configuration doesn't automatically trigger invalidation
        $this->container
            ->get('kernel')
            ->rebuildContainer();
        
        /** @var \Drupal\Core\Extension\ThemeExtensionList $theme_extension_list */
        $theme_extension_list = \Drupal::service('extension.list.theme');
        $extensions = $theme_extension_list->getList();
        $this->assertArrayHasKey('test_theme', $extensions);
    }
    
    /**
     * Tests that themes have an empty default version set.
     */
    public function testThemeWithoutVersion() {
        $theme = \Drupal::service('extension.list.theme')->get('test_theme_settings_features');
        $this->assertNull($theme->info['version']);
    }

}