ConfigTest.php

<?php

namespace Drupal\Tests\system\Functional\File;

use Drupal\Tests\BrowserTestBase;

/**
 * Tests file system configuration operations.
 *
 * @group File
 */
class ConfigTest extends BrowserTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    protected function setUp() {
        parent::setUp();
        $this->drupalLogin($this->drupalCreateUser([
            'administer site configuration',
        ]));
    }
    
    /**
     * Tests file configuration page.
     */
    public function testFileConfigurationPage() {
        $this->drupalGet('admin/config/media/file-system');
        // Set the file paths to non-default values.
        // The respective directories are created automatically
        // upon form submission.
        $fields = [
            'file_default_scheme' => 'private',
        ];
        // Check that public and private can be selected as default scheme.
        $this->assertText('Public local files served by the webserver.');
        $this->assertText('Private local files served by Drupal.');
        $this->drupalPostForm(NULL, $fields, t('Save configuration'));
        $this->assertText(t('The configuration options have been saved.'));
        foreach ($fields as $field => $value) {
            $this->assertFieldByName($field, $value);
        }
        // Remove the private path, rebuild the container and verify that private
        // can no longer be selected in the UI.
        $settings['settings']['file_private_path'] = (object) [
            'value' => '',
            'required' => TRUE,
        ];
        $this->writeSettings($settings);
        $this->rebuildContainer();
        $this->drupalGet('admin/config/media/file-system');
        $this->assertText('Public local files served by the webserver.');
        $this->assertNoText('Private local files served by Drupal.');
    }

}