LanguageListModuleInstallTest.php

<?php

namespace Drupal\Tests\language\Functional;

use Drupal\Tests\BrowserTestBase;

/**
 * Tests that the language list is not empty when language is installed.
 *
 * @group language
 */
class LanguageListModuleInstallTest extends BrowserTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'language_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests enabling Language.
     */
    public function testModuleInstallLanguageList() {
        // Since LanguageManager::getLanguages() uses static caches we need to do
        // this by enabling the module using the UI.
        $admin_user = $this->drupalCreateUser([
            'access administration pages',
            'administer modules',
        ]);
        $this->drupalLogin($admin_user);
        $edit = [];
        $edit['modules[language][enable]'] = 'language';
        $this->drupalGet('admin/modules');
        $this->submitForm($edit, 'Install');
        $this->assertEquals(1, \Drupal::state()->get('language_test.language_count_preinstall', 0), 'Using LanguageManager::getLanguages() returns 1 language during Language installation.');
        // Get updated module list by rebuilding container.
        $this->rebuildContainer();
        $this->assertTrue(\Drupal::moduleHandler()->moduleExists('language'), 'Language module is enabled');
    }

}