Initial Drupal 11 with DDEV setup

web/core/tests/Drupal/FunctionalTests/FolderTest.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\FunctionalTests;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests BrowserTestBase's treatment of hook_install() during setup.
+ *
+ * Image module is used for test.
+ *
+ * @group browsertestbase
+ */
+class FolderTest extends BrowserTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = ['image'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stark';
+
+  public function testFolderSetup(): void {
+    $directory = 'public://styles';
+    $this->assertTrue(\Drupal::service('file_system')->prepareDirectory($directory, FALSE), 'Directory created.');
+  }
+
+}