ModuleExtensionListTest.php

<?php

namespace Drupal\KernelTests\Core\Extension;

use Drupal\KernelTests\KernelTestBase;

/**
 * @coversDefaultClass \Drupal\Core\Extension\ModuleExtensionList
 * @group Extension
 */
class ModuleExtensionListTest extends KernelTestBase {
    
    /**
     * @covers ::getList
     */
    public function testGetlist() {
        \Drupal::configFactory()->getEditable('core.extension')
            ->set('module.testing', 1000)
            ->set('profile', 'testing')
            ->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\ModuleExtensionList $module_extension_list */
        $module_extension_list = \Drupal::service('extension.list.module');
        $extensions = $module_extension_list->getList();
        $this->assertArrayHasKey('testing', $extensions);
        $this->assertEquals(1000, $extensions['testing']->weight);
    }

}