CountryManagerTest.php

<?php

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

use Drupal\KernelTests\KernelTestBase;

/**
 * Tests Country Manager functionality.
 *
 * @group CountryManager
 * @covers Drupal\Core\Locale\CountryManager
 */
class CountryManagerTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'language',
        'locale',
        'locale_test',
    ];
    
    /**
     * Tests that hook_countries_alters() works as expected.
     */
    public function testHookCountriesAlter() : void {
        $countries = $this->container
            ->get('country_manager')
            ->getList();
        self::assertArrayHasKey('EB', $countries);
        self::assertSame('Elbonia', $countries['EB']);
    }

}