ModuleHandlerTest.php

<?php

namespace Drupal\KernelTests\Core\Extension;

use Drupal\KernelTests\KernelTestBase;

/**
 * @coversDefaultClass \Drupal\Core\Extension\ModuleHandler
 *
 * @group Extension
 */
class ModuleHandlerTest extends KernelTestBase {
    
    /**
     * Tests requesting the name of an invalid module.
     *
     * @covers ::getName
     * @group legacy
     * @expectedDeprecation Calling ModuleHandler::getName() with an unknown module is deprecated in Drupal 8.7.0 and support for this will be removed in Drupal 9.0.0, check that the module exists before calling this method. See https://www.drupal.org/node/3024541.
     */
    public function testInvalidGetName() {
        $module_handler = $this->container
            ->get('module_handler');
        $this->assertSame('module_nonsense', $module_handler->getName('module_nonsense'));
    }

}