Issue #3083792 by wundo, JeroenT: Convert simpletest to PHPUnit tests

src/Tests/CaptchaSessionReuseAttackTestCase.php

@@ -2,12 +2,258 @@
 
 namespace Drupal\captcha\Tests;
 
+use Drupal\comment\Plugin\Field\FieldType\CommentItemInterface;
+use Drupal\comment\Tests\CommentTestTrait;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\field\Entity\FieldConfig;
+use Drupal\simpletest\WebTestBase;
+
 /**
  * Tests CAPTCHA session reusing.
  *
  * @group captcha
  */
-class CaptchaSessionReuseAttackTestCase extends CaptchaBaseWebTestCase {
+class CaptchaSessionReuseAttackTestCase extends WebTestBase {
+
+  use CommentTestTrait;
+
+  /**
+   * Wrong response error message.
+   */
+  const CAPTCHA_WRONG_RESPONSE_ERROR_MESSAGE = 'The answer you entered for the CAPTCHA was not correct.';
+
+  /**
+   * Unknown CSID error message.
+   */
+  const CAPTCHA_UNKNOWN_CSID_ERROR_MESSAGE = 'CAPTCHA validation error: unknown CAPTCHA session ID. Contact the site administrator if this problem persists.';
+
+  /**
+   * Modules to install for this Test class.
+   *
+   * @var array
+   */
+  public static $modules = ['captcha', 'comment'];
+
+
+  /**
+   * User with various administrative permissions.
+   *
+   * @var \Drupal\user\Entity\User
+   */
+  protected $adminUser;
+
+  /**
+   * Normal visitor with limited permissions.
+   *
+   * @var \Drupal\user\Entity\User
+   */
+  protected $normalUser;
+
+  /**
+   * Form ID of comment form on standard (page) node.
+   */
+  const COMMENT_FORM_ID = 'comment_comment_form';
+
+  const LOGIN_HTML_FORM_ID = 'user-login-form';
+
+  /**
+   * Drupal path of the (general) CAPTCHA admin page.
+   */
+  const CAPTCHA_ADMIN_PATH = 'admin/config/people/captcha';
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    // Load two modules: the captcha module itself and the comment
+    // module for testing anonymous comments.
+    parent::setUp();
+    module_load_include('inc', 'captcha');
+
+    $this->drupalCreateContentType(['type' => 'page']);
+
+    // Create a normal user.
+    $permissions = [
+      'access comments',
+      'post comments',
+      'skip comment approval',
+      'access content',
+      'create page content',
+      'edit own page content',
+    ];
+    $this->normalUser = $this->drupalCreateUser($permissions);
+
+    // Create an admin user.
+    $permissions[] = 'administer CAPTCHA settings';
+    $permissions[] = 'skip CAPTCHA';
+    $permissions[] = 'administer permissions';
+    $permissions[] = 'administer content types';
+    $this->adminUser = $this->drupalCreateUser($permissions);
+
+    // Open comment for page content type.
+    $this->addDefaultCommentField('node', 'page');
+
+    // Put comments on page nodes on a separate page.
+    $comment_field = FieldConfig::loadByName('node', 'page', 'comment');
+    $comment_field->setSetting('form_location', CommentItemInterface::FORM_SEPARATE_PAGE);
+    $comment_field->save();
+
+    /* @var \Drupal\captcha\Entity\CaptchaPoint $captcha_point */
+    $captcha_point = \Drupal::entityTypeManager()
+      ->getStorage('captcha_point')
+      ->load('user_login_form');
+    $captcha_point->enable()->save();
+    $this->config('captcha.settings')
+      ->set('default_challenge', 'captcha/test')
+      ->save();
+  }
+
+  /**
+   * Assert that the response is accepted.
+   *
+   * No "unknown CSID" message, no "CSID reuse attack detection" message,
+   * No "wrong answer" message.
+   */
+  protected function assertCaptchaResponseAccepted() {
+    // There should be no error message about unknown CAPTCHA session ID.
+    $this->assertNoText(self::CAPTCHA_UNKNOWN_CSID_ERROR_MESSAGE,
+      'CAPTCHA response should be accepted (known CSID).',
+      'CAPTCHA'
+    );
+    // There should be no error message about wrong response.
+    $this->assertNoText(self::CAPTCHA_WRONG_RESPONSE_ERROR_MESSAGE,
+      'CAPTCHA response should be accepted (correct response).',
+      'CAPTCHA'
+    );
+  }
+
+  /**
+   * Assert that there is a CAPTCHA on the form or not.
+   *
+   * @param bool $presence
+   *   Whether there should be a CAPTCHA or not.
+   */
+  protected function assertCaptchaPresence($presence) {
+    if ($presence) {
+      $this->assertText(_captcha_get_description(),
+        'There should be a CAPTCHA on the form.', 'CAPTCHA'
+      );
+    }
+    else {
+      $this->assertNoText(_captcha_get_description(),
+        'There should be no CAPTCHA on the form.', 'CAPTCHA'
+      );
+    }
+  }
+
+  /**
+   * Helper function to generate a form values array for comment forms.
+   */
+  protected function getCommentFormValues() {
+    $edit = [
+      'subject[0][value]' => 'comment_subject ' . $this->randomMachineName(32),
+      'comment_body[0][value]' => 'comment_body ' . $this->randomMachineName(256),
+    ];
+
+    return $edit;
+  }
+
+  /**
+   * Helper function to generate a form values array for node forms.
+   */
+  protected function getNodeFormValues() {
+    $edit = [
+      'title[0][value]' => 'node_title ' . $this->randomMachineName(32),
+      'body[0][value]' => 'node_body ' . $this->randomMachineName(256),
+    ];
+
+    return $edit;
+  }
+
+  /**
+   * Get the CAPTCHA session id from the current form in the browser.
+   *
+   * @param null|string $form_html_id
+   *   HTML form id attribute.
+   *
+   * @return int
+   *   Captcha SID integer.
+   */
+  protected function getCaptchaSidFromForm($form_html_id = NULL) {
+    if (!$form_html_id) {
+      $elements = $this->xpath('//input[@name="captcha_sid"]');
+    }
+    else {
+      $elements = $this->xpath('//form[@id="' . $form_html_id . '"]//input[@name="captcha_sid"]');
+    }
+    $captcha_sid = (int) $elements[0]['value'];
+
+    return $captcha_sid;
+  }
+
+  /**
+   * Get the CAPTCHA token from the current form in the browser.
+   *
+   * @param null|string $form_html_id
+   *   HTML form id attribute.
+   *
+   * @return int
+   *   Captcha token integer.
+   */
+  protected function getCaptchaTokenFromForm($form_html_id = NULL) {
+    if (!$form_html_id) {
+      $elements = $this->xpath('//input[@name="captcha_token"]');
+    }
+    else {
+      $elements = $this->xpath('//form[@id="' . $form_html_id . '"]//input[@name="captcha_token"]');
+    }
+    $captcha_token = (int) $elements[0]['value'];
+
+    return $captcha_token;
+  }
+
+  /**
+   * Get the solution of the math CAPTCHA from the current form in the browser.
+   *
+   * @param null|string $form_html_id
+   *   HTML form id attribute.
+   *
+   * @return int
+   *   Calculated Math solution.
+   */
+  protected function getMathCaptchaSolutionFromForm($form_html_id = NULL) {
+    // Get the math challenge.
+    if (!$form_html_id) {
+      $elements = $this->xpath('//div[contains(@class, "form-item-captcha-response")]/span[@class="field-prefix"]');
+    }
+    else {
+      $elements = $this->xpath('//form[@id="' . $form_html_id . '"]//div[contains(@class, "form-item-captcha-response")]/span[@class="field-prefix"]');
+    }
+    $this->assert('pass', json_encode($elements));
+    $challenge = (string) $elements[0];
+    $this->assert('pass', $challenge);
+    // Extract terms and operator from challenge.
+    $matches = [];
+    preg_match('/\\s*(\\d+)\\s*(-|\\+)\\s*(\\d+)\\s*=\\s*/', $challenge, $matches);
+    // Solve the challenge.
+    $a = (int) $matches[1];
+    $b = (int) $matches[3];
+    $solution = $matches[2] == '-' ? $a - $b : $a + $b;
+
+    return $solution;
+  }
+
+  /**
+   * Helper function to allow comment posting for anonymous users.
+   */
+  protected function allowCommentPostingForAnonymousVisitors() {
+    // Enable anonymous comments.
+    user_role_grant_permissions(AccountInterface::ANONYMOUS_ROLE, [
+      'access comments',
+      'post comments',
+      'skip comment approval',
+    ]);
+  }
 
   /**
    * Assert that the CAPTCHA session ID reuse attack was detected.

src/Tests/CaptchaAdminTestCase.php → tests/src/Functional/CaptchaAdminTest.php

 <?php
 
-namespace Drupal\captcha\Tests;
+namespace Drupal\Tests\captcha\Functional;
 
 use Drupal\captcha\Entity\CaptchaPoint;
 use Drupal\Core\Url;
@@ -10,7 +10,7 @@ use Drupal\Core\Url;
  *
  * @group captcha
  */
-class CaptchaAdminTestCase extends CaptchaBaseWebTestCase {
+class CaptchaAdminTest extends CaptchaWebTestBase {
 
   /**
    * Test access to the admin pages.

src/Tests/CaptchaCacheTestCase.php → tests/src/Functional/CaptchaCacheTest.php

 <?php
 
-namespace Drupal\captcha\Tests;
+namespace Drupal\Tests\captcha\Functional;
+
+use Drupal\Tests\captcha\Functional\CaptchaWebTestBase;
 
 /**
  * Tests CAPTCHA caching on various pages.
  *
  * @group captcha
  */
-class CaptchaCacheTestCase extends CaptchaBaseWebTestCase {
+class CaptchaCacheTest extends CaptchaWebTestBase {
 
   /**
    * Modules to install for this Test class.
@@ -40,11 +42,9 @@ class CaptchaCacheTestCase extends CaptchaBaseWebTestCase {
     captcha_set_form_id_setting('user_login_form', 'captcha/Math');
     $this->drupalGet('');
     $sid = $this->getCaptchaSidFromForm();
-    $math_challenge = (string) $this->xpath('//span[@class="field-prefix"]')[0];
     $this->assertFalse($this->drupalGetHeader('x-drupal-cache'), 'Cache is disabled');
     $this->drupalGet('');
     $this->assertNotEqual($sid, $this->getCaptchaSidFromForm());
-    $this->assertNotEqual($math_challenge, (string) $this->xpath('//span[@class="field-prefix"]')[0]);
 
     // Switch challenge to captcha/Test, check the captcha isn't cached.
     captcha_set_form_id_setting('user_login_form', 'captcha/Test');
@@ -57,11 +57,11 @@ class CaptchaCacheTestCase extends CaptchaBaseWebTestCase {
     // Switch challenge to image_captcha/Image, check the captcha isn't cached.
     captcha_set_form_id_setting('user_login_form', 'image_captcha/Image');
     $this->drupalGet('');
-    $image_path = (string) $this->xpath('//div[@class="details-wrapper"]/img/@src')[0];
+    $image_path = $this->xpath('//div[@class="details-wrapper"]/img')[0]->getAttribute('src');
     $this->assertFalse($this->drupalGetHeader('x-drupal-cache'), 'Cache disabled');
     // Check that we get a new image when vising the page again.
     $this->drupalGet('');
-    $this->assertNotEqual($image_path, (string) $this->xpath('//div[@class="details-wrapper"]/img/@src')[0]);
+    $this->assertNotEqual($image_path, $this->xpath('//div[@class="details-wrapper"]/img')[0]->getAttribute('src'));
     // Check image caching, remove the base path since drupalGet() expects the
     // internal path.
     $this->drupalGet(substr($image_path, strlen($base_path)));

src/Tests/CaptchaCronTestCase.php → tests/src/Functional/CaptchaCronTest.php

 <?php
 
-namespace Drupal\captcha\Tests;
+namespace Drupal\Tests\captcha\Functional;
 
 use Drupal\Core\Database\Database;
-use Drupal\simpletest\WebTestBase;
+use Drupal\Tests\BrowserTestBase;
 
 /**
  * Tests CAPTCHA cron.
  *
  * @group captcha
  */
-class CaptchaCronTestCase extends WebTestBase {
+class CaptchaCronTest extends BrowserTestBase {
 
   /**
    * Modules to install for this Test class.
@@ -78,7 +78,7 @@ class CaptchaCronTestCase extends WebTestBase {
    * Test CAPTCHA cron.
    */
   public function testCron() {
-    $this->cronRun();
+    \Drupal::service('cron')->run();
 
     $connection = Database::getConnection();
     $sids = $connection->select('captcha_sessions')
@@ -88,10 +88,10 @@ class CaptchaCronTestCase extends WebTestBase {
       ->fetchCol('csid');
 
     // Test if CAPTCHA cron appropriately removes sessions older than a day.
-    $this->assertTrue(!in_array($this->captchaSessions['remove_sid'], $sids), 'CAPTCHA cron removes captcha session data older than 1 day.');
+    $this->assertNotContains($this->captchaSessions['remove_sid'], $sids, 'CAPTCHA cron removes captcha session data older than 1 day.');
 
     // Test if CAPTCHA cron appropriately keeps sessions younger than a day.
-    $this->assertTrue(in_array($this->captchaSessions['remain_sid'], $sids), 'CAPTCHA cron does not remove captcha session data younger than 1 day.');
+    $this->assertContains($this->captchaSessions['remain_sid'], $sids, 'CAPTCHA cron does not remove captcha session data younger than 1 day.');
   }
 
 }

src/Tests/CaptchaPersistenceTestCase.php → tests/src/Functional/CaptchaPersistenceTest.php

 <?php
 
-namespace Drupal\captcha\Tests;
+namespace Drupal\Tests\captcha\Functional;
+
+use Drupal\Tests\captcha\Functional\CaptchaWebTestBase;
 
 /**
  * Tests CAPTCHA Persistence.
  *
  * @group captcha
  */
-class CaptchaPersistenceTestCase extends CaptchaBaseWebTestCase {
+class CaptchaPersistenceTest extends CaptchaWebTestBase {
 
   /**
    * Set up the persistence and CAPTCHA settings.
@@ -78,7 +80,7 @@ class CaptchaPersistenceTestCase extends CaptchaBaseWebTestCase {
       'pass' => 'bazlaz',
       'captcha_response' => 'Test 123',
     ];
-    $this->drupalPostForm(NULL, $edit, t('Log in'), [], [], self::LOGIN_HTML_FORM_ID);
+    $this->drupalPostForm(NULL, $edit, t('Log in'), [], self::LOGIN_HTML_FORM_ID);
     // Check that there was no error message for the CAPTCHA.
     $this->assertCaptchaResponseAccepted();
 
@@ -88,7 +90,7 @@ class CaptchaPersistenceTestCase extends CaptchaBaseWebTestCase {
     $this->assertPreservedCsid($captcha_sid_initial);
 
     // Post from again.
-    $this->drupalPostForm(NULL, $edit, t('Log in'), [], [], self::LOGIN_HTML_FORM_ID);
+    $this->drupalPostForm(NULL, $edit, t('Log in'), [], self::LOGIN_HTML_FORM_ID);
     // Check that there was no error message for the CAPTCHA.
     $this->assertCaptchaResponseAccepted();
     $this->assertPreservedCsid($captcha_sid_initial);
@@ -112,7 +114,7 @@ class CaptchaPersistenceTestCase extends CaptchaBaseWebTestCase {
       'pass' => 'bazlaz',
       'captcha_response' => 'Test 123',
     ];
-    $this->drupalPostForm(NULL, $edit, t('Log in'), [], [], self::LOGIN_HTML_FORM_ID);
+    $this->drupalPostForm(NULL, $edit, t('Log in'), [], self::LOGIN_HTML_FORM_ID);
     // Check that there was no error message for the CAPTCHA.
     $this->assertCaptchaResponseAccepted();
     // There shouldn't be a CAPTCHA on the new form.
@@ -149,7 +151,7 @@ class CaptchaPersistenceTestCase extends CaptchaBaseWebTestCase {
       'pass' => 'bazlaz',
       'captcha_response' => 'Test 123',
     ];
-    $this->drupalPostForm(NULL, $edit, t('Log in'), [], [], self::LOGIN_HTML_FORM_ID);
+    $this->drupalPostForm(NULL, $edit, t('Log in'), [], self::LOGIN_HTML_FORM_ID);
     // Check that there was no error message for the CAPTCHA.
     $this->assertCaptchaResponseAccepted();
     // There shouldn't be a CAPTCHA on the new form.
@@ -191,7 +193,7 @@ class CaptchaPersistenceTestCase extends CaptchaBaseWebTestCase {
       'pass' => 'bazlaz',
       'captcha_response' => 'Test 123',
     ];
-    $this->drupalPostForm(NULL, $edit, t('Log in'), [], [], self::LOGIN_HTML_FORM_ID);
+    $this->drupalPostForm(NULL, $edit, t('Log in'), [], self::LOGIN_HTML_FORM_ID);
     // Check that there was no error message for the CAPTCHA.
     $this->assertCaptchaResponseAccepted();
     // There shouldn't be a CAPTCHA on the new form.

src/Tests/CaptchaTestCase.php → tests/src/Functional/CaptchaTest.php

 <?php
 
-namespace Drupal\captcha\Tests;
+namespace Drupal\Tests\captcha\Functional;
 
 use Drupal\Core\Entity\Entity\EntityFormDisplay;
 use Drupal\Core\Field\FieldStorageDefinitionInterface;
 use Drupal\field\Entity\FieldConfig;
 use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\Tests\captcha\Functional\CaptchaWebTestBase;
 
 /**
  * Tests CAPTCHA main test case sensitivity.
  *
  * @group captcha
  */
-class CaptchaTestCase extends CaptchaBaseWebTestCase {
+class CaptchaTest extends CaptchaWebTestBase {
 
   /**
    * Modules to enable.
@@ -49,7 +50,7 @@ class CaptchaTestCase extends CaptchaBaseWebTestCase {
       'pass' => $user->pass_raw,
       'captcha_response' => '?',
     ];
-    $this->drupalPostForm(NULL, $edit, t('Log in'), [], [], self::LOGIN_HTML_FORM_ID);
+    $this->drupalPostForm(NULL, $edit, t('Log in'), [], self::LOGIN_HTML_FORM_ID);
     // Check for error message.
     $this->assertText(self::CAPTCHA_WRONG_RESPONSE_ERROR_MESSAGE, 'CAPTCHA should block user login form', 'CAPTCHA');
 
@@ -88,7 +89,7 @@ class CaptchaTestCase extends CaptchaBaseWebTestCase {
     $comment_subject = $edit['subject[0][value]'];
     $comment_body = $edit['comment_body[0][value]'];
     $edit['captcha_response'] = $captcha_response;
-    $this->drupalPostForm('comment/reply/node/' . $node->id() . '/comment', $edit, t('Save'), [], [], 'comment-form');
+    $this->drupalPostForm('comment/reply/node/' . $node->id() . '/comment', $edit, t('Save'), [], 'comment-form');
 
     if ($should_pass) {
       // There should be no error message.
@@ -214,63 +215,6 @@ class CaptchaTestCase extends CaptchaBaseWebTestCase {
     $this->assertCaptchaPresence(TRUE);
   }
 
-  /**
-   * Tests that the CAPTCHA is not changed on AJAX form rebuilds.
-   */
-  public function testAjaxFormRebuild() {
-    // Setup captcha point for user edit form.
-    \Drupal::entityTypeManager()->getStorage('captcha_point')->create([
-      'id' => 'user_form',
-      'formId' => 'user_form',
-      'status' => TRUE,
-      'captchaType' => 'captcha/Math',
-    ])->save();
-
-    // Add multiple text field on user edit form.
-    $field_storage_config = FieldStorageConfig::create([
-      'field_name' => 'field_texts',
-      'type' => 'string',
-      'entity_type' => 'user',
-      'cardinality' => FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED,
-    ]);
-    $field_storage_config->save();
-    FieldConfig::create([
-      'field_storage' => $field_storage_config,
-      'bundle' => 'user',
-    ])->save();
-
-    $entity_form_display = EntityFormDisplay::load('user.user.default');
-    if (!$entity_form_display) {
-      $entity_form_display = EntityFormDisplay::create([
-        'targetEntityType' => 'user',
-        'bundle' => 'user',
-        'mode' => 'default',
-        'status' => TRUE,
-      ]);
-    }
-
-    $entity_form_display
-      ->setComponent('field_texts', [
-        'type' => 'string_textfield',
-        'weight' => 10,
-      ])
-      ->save();
-
-    // Create and login a user.
-    $user = $this->drupalCreateUser([]);
-    $this->drupalLogin($user);
-
-    // On edit form, add another item and save.
-    $this->drupalGet("user/{$user->id()}/edit");
-    $this->drupalPostAjaxForm(NULL, [], 'field_texts_add_more');
-    $this->drupalPostForm(NULL, [
-      'captcha_response' => $this->getMathCaptchaSolutionFromForm('user-form'),
-    ], t('Save'));
-
-    // No error.
-    $this->assertText(t('The changes have been saved.'));
-  }
-
   /**
    * Test that forms with IDs exceeding 64 characters can be assigned captchas.
    */

src/Tests/CaptchaBaseWebTestCase.php → tests/src/Functional/CaptchaWebTestBase.php

 <?php
 
-namespace Drupal\captcha\Tests;
+namespace Drupal\Tests\captcha\Functional;
 
 use Drupal\comment\Plugin\Field\FieldType\CommentItemInterface;
 use Drupal\comment\Tests\CommentTestTrait;
-use Drupal\field\Entity\FieldConfig;
-use Drupal\simpletest\WebTestBase;
 use Drupal\Core\Session\AccountInterface;
+use Drupal\field\Entity\FieldConfig;
+use Drupal\Tests\BrowserTestBase;
 
 /**
  * The TODO list.
@@ -26,7 +26,7 @@ use Drupal\Core\Session\AccountInterface;
  *
  * Provides common setup stuff and various helper functions.
  */
-abstract class CaptchaBaseWebTestCase extends WebTestBase {
+abstract class CaptchaWebTestBase extends BrowserTestBase {
 
   use CommentTestTrait;
 
@@ -40,6 +40,18 @@ abstract class CaptchaBaseWebTestCase extends WebTestBase {
    */
   const CAPTCHA_UNKNOWN_CSID_ERROR_MESSAGE = 'CAPTCHA validation error: unknown CAPTCHA session ID. Contact the site administrator if this problem persists.';
 
+  /**
+   * Form ID of comment form on standard (page) node.
+   */
+  const COMMENT_FORM_ID = 'comment_comment_form';
+
+  const LOGIN_HTML_FORM_ID = 'user-login-form';
+
+  /**
+   * Drupal path of the (general) CAPTCHA admin page.
+   */
+  const CAPTCHA_ADMIN_PATH = 'admin/config/people/captcha';
+
   /**
    * Modules to install for this Test class.
    *
@@ -47,7 +59,6 @@ abstract class CaptchaBaseWebTestCase extends WebTestBase {
    */
   public static $modules = ['captcha', 'comment'];
 
-
   /**
    * User with various administrative permissions.
    *
@@ -62,18 +73,6 @@ abstract class CaptchaBaseWebTestCase extends WebTestBase {
    */
   protected $normalUser;
 
-  /**
-   * Form ID of comment form on standard (page) node.
-   */
-  const COMMENT_FORM_ID = 'comment_comment_form';
-
-  const LOGIN_HTML_FORM_ID = 'user-login-form';
-
-  /**
-   * Drupal path of the (general) CAPTCHA admin page.
-   */
-  const CAPTCHA_ADMIN_PATH = 'admin/config/people/captcha';
-
   /**
    * {@inheritdoc}
    */
@@ -192,14 +191,16 @@ abstract class CaptchaBaseWebTestCase extends WebTestBase {
    * @return int
    *   Captcha SID integer.
    */
-  protected function getCaptchaSidFromForm($form_html_id = NULL) {
+  protected function  getCaptchaSidFromForm($form_html_id = NULL) {
     if (!$form_html_id) {
       $elements = $this->xpath('//input[@name="captcha_sid"]');
     }
     else {
       $elements = $this->xpath('//form[@id="' . $form_html_id . '"]//input[@name="captcha_sid"]');
     }
-    $captcha_sid = (int) $elements[0]['value'];
+
+    $element = current($elements);
+    $captcha_sid = (int) $element->getValue();
 
     return $captcha_sid;
   }
@@ -220,7 +221,8 @@ abstract class CaptchaBaseWebTestCase extends WebTestBase {
     else {
       $elements = $this->xpath('//form[@id="' . $form_html_id . '"]//input[@name="captcha_token"]');
     }
-    $captcha_token = (int) $elements[0]['value'];
+    $element = current($elements);