Initial Drupal 11 with DDEV setup

web/core/tests/Drupal/FunctionalJavascriptTests/AjaxWaitTest.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\FunctionalJavascriptTests;
+
+/**
+ * Tests that unnecessary or untracked XHRs will cause a test failure.
+ *
+ * @group javascript
+ * @group legacy
+ */
+class AjaxWaitTest extends WebDriverTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'starterkit_theme';
+
+  /**
+   * Tests that an unnecessary wait triggers an error.
+   */
+  public function testUnnecessaryWait(): void {
+    $this->drupalGet('user');
+
+    $this->expectException(\RuntimeException::class);
+    $this->expectExceptionMessage('There are no AJAX requests to wait for.');
+
+    $this->assertSession()->assertWaitOnAjaxRequest(500);
+  }
+
+  /**
+   * Tests that an untracked XHR triggers an error.
+   */
+  public function testUntrackedXhr(): void {
+    $this->getSession()->executeScript(<<<JS
+let xhr = new XMLHttpRequest();
+xhr.open('GET', '/foobar');
+xhr.send();
+JS);
+    $this->expectException(\RuntimeException::class);
+    $this->expectExceptionMessage('0 XHR requests through jQuery, but 1 observed in the browser — this requires js_testing_ajax_request_test.js to be updated.');
+
+    $this->assertSession()->assertExpectedAjaxRequest(1, 500);
+  }
+
+}