Add a test to ensure referrerpolicy is set

tests/src/Functional/NoReferrerTest.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace Drupal\Tests\turnstile_protect\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests redirection from /node/1 to /challenge.
+ *
+ * @group turnstile_protect
+ */
+class NoReferrerTest extends BrowserTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'node',
+    'captcha',
+    'turnstile',
+    'turnstile_protect',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'claro';
+
+  /**
+   * Sets up the test environment.
+   */
+  protected function setUp(): void {
+    parent::setUp();
+
+    // Always pass the turnstile
+    // https://developers.cloudflare.com/turnstile/troubleshooting/testing/
+    $this->config('turnstile.settings')
+      ->set('site_key', '1x00000000000000000000AA')
+      ->set('secret_key', '1x0000000000000000000000000000000AA')
+      ->save();
+  }
+
+  /**
+   * Tests referrerpolicy is set on cloudflare <script>.
+   */
+  public function testReferrer() {
+    $cloudFlareSrc = \Drupal::config('turnstile.settings')->get('turnstile_src');
+    $this->drupalGet('/challenge');
+    $page = $this->getSession()->getPage();
+    $script = $page->find('css', "script[src='$cloudFlareSrc']");
+    $this->assertNotNull($script, "Cloudflare script could not be found on page");
+    $attribute = 'referrerpolicy';
+    $this->assertTrue($script->hasAttribute($attribute) && $script->getAttribute($attribute) === 'no-referrer', "referrerpolicy not correct");
+  }
+
+}