class DrupalWebTestCase in SimpleTest 7

Test case for typical Drupal tests.

Hierarchy

• class \DrupalTestCase
  • class \DrupalWebTestCase

File

./drupal_web_test_case.php, line 572

class DrupalWebTestCase extends DrupalTestCase {

  /**
   * The URL currently loaded in the internal browser.
   *
   * @var string
   */
  protected $url;

  /**
   * The handle of the current cURL connection.
   *
   * @var resource
   */
  protected $curlHandle;

  /**
   * The headers of the page currently loaded in the internal browser.
   *
   * @var Array
   */
  protected $headers;

  /**
   * The content of the page currently loaded in the internal browser.
   *
   * @var string
   */
  protected $content;

  /**
   * The content of the page currently loaded in the internal browser (plain text version).
   *
   * @var string
   */
  protected $plainTextContent;

  /**
   * The parsed version of the page.
   *
   * @var SimpleXMLElement
   */
  protected $elements = NULL;

  /**
   * The current user logged in using the internal browser.
   *
   * @var bool
   */
  protected $loggedInUser = FALSE;

  /**
   * The current cookie file used by cURL.
   *
   * We do not reuse the cookies in further runs, so we do not need a file
   * but we still need cookie handling, so we set the jar to NULL.
   */
  protected $cookieFile = NULL;

  /**
   * Additional cURL options.
   *
   * DrupalWebTestCase itself never sets this but always obeys what is set.
   */
  protected $additionalCurlOptions = array();

  /**
   * The original user, before it was changed to a clean uid = 1 for testing purposes.
   *
   * @var object
   */
  protected $originalUser = NULL;

  /**
   * HTTP authentication credentials (<username>:<password>).
   */
  protected $httpauth_credentials = NULL;

  /**
   * The current session name, if available.
   */
  protected $session_name = NULL;

  /**
   * The current session ID, if available.
   */
  protected $session_id = NULL;

  /**
   * Constructor for DrupalWebTestCase.
   */
  function __construct($test_id = NULL) {
    parent::__construct($test_id);
    $this->skipClasses[__CLASS__] = TRUE;
  }

  /**
   * Get a node from the database based on its title.
   *
   * @param title
   *   A node title, usually generated by $this->randomName().
   *
   * @return
   *   A node object matching $title.
   */
  function drupalGetNodeByTitle($title) {
    $nodes = node_load_multiple(array(), array(
      'title' => $title,
    ));

    // Load the first node returned from the database.
    $returned_node = reset($nodes);
    return $returned_node;
  }

  /**
   * Creates a node based on default settings.
   *
   * @param $settings
   *   An associative array of settings to change from the defaults, keys are
   *   node properties, for example 'title' => 'Hello, world!'.
   * @return
   *   Created node object.
   */
  protected function drupalCreateNode($settings = array()) {

    // Populate defaults array.
    $settings += array(
      'body' => array(
        FIELD_LANGUAGE_NONE => array(
          array(),
        ),
      ),
      'title' => array(
        FIELD_LANGUAGE_NONE => array(
          array(
            'value' => $this
              ->randomName(8),
          ),
        ),
      ),
      'comment' => 2,
      'changed' => REQUEST_TIME,
      'moderate' => 0,
      'promote' => 0,
      'revision' => 1,
      'log' => '',
      'status' => 1,
      'sticky' => 0,
      'type' => 'page',
      'revisions' => NULL,
      'taxonomy' => NULL,
    );

    // Use the original node's created time for existing nodes.
    if (isset($settings['created']) && !isset($settings['date'])) {
      $settings['date'] = format_date($settings['created'], 'custom', 'Y-m-d H:i:s O');
    }

    // If the node's user uid is not specified manually, use the currently
    // logged in user if available, or else the user running the test.
    if (!isset($settings['uid'])) {
      if ($this->loggedInUser) {
        $settings['uid'] = $this->loggedInUser->uid;
      }
      else {
        global $user;
        $settings['uid'] = $user->uid;
      }
    }

    // Merge body field value and format separately.
    $body = array(
      'value' => $this
        ->randomName(32),
      'format' => filter_default_format(),
    );
    $langcode = !empty($settings['language']) ? $settings['language'] : FIELD_LANGUAGE_NONE;
    $settings['body'][$langcode][0] += $body;
    $node = (object) $settings;
    node_save($node);

    // Small hack to link revisions to our test user.
    db_update('node_revision')
      ->fields(array(
      'uid' => $node->uid,
    ))
      ->condition('vid', $node->vid)
      ->execute();
    return $node;
  }

  /**
   * Creates a custom content type based on default settings.
   *
   * @param $settings
   *   An array of settings to change from the defaults.
   *   Example: 'type' => 'foo'.
   * @return
   *   Created content type.
   */
  protected function drupalCreateContentType($settings = array()) {

    // Find a non-existent random type name.
    do {
      $name = strtolower($this
        ->randomName(8));
    } while (node_type_get_type($name));

    // Populate defaults array.
    $defaults = array(
      'type' => $name,
      'name' => $name,
      'base' => 'node_content',
      'description' => '',
      'help' => '',
      'title_label' => 'Title',
      'body_label' => 'Body',
      'has_title' => 1,
      'has_body' => 1,
    );

    // Imposed values for a custom type.
    $forced = array(
      'orig_type' => '',
      'old_type' => '',
      'module' => 'node',
      'custom' => 1,
      'modified' => 1,
      'locked' => 0,
    );
    $type = $forced + $settings + $defaults;
    $type = (object) $type;
    $saved_type = node_type_save($type);
    node_types_rebuild();
    menu_rebuild();
    $this
      ->assertEqual($saved_type, SAVED_NEW, t('Created content type %type.', array(
      '%type' => $type->type,
    )));

    // Reset permissions so that permissions for this content type are available.
    $this
      ->checkPermissions(array(), TRUE);
    return $type;
  }

  /**
   * Get a list files that can be used in tests.
   *
   * @param $type
   *   File type, possible values: 'binary', 'html', 'image', 'javascript', 'php', 'sql', 'text'.
   * @param $size
   *   File size in bytes to match. Please check the tests/files folder.
   * @return
   *   List of files that match filter.
   */
  protected function drupalGetTestFiles($type, $size = NULL) {
    $files = array();

    // Make sure type is valid.
    if (in_array($type, array(
      'binary',
      'html',
      'image',
      'javascript',
      'php',
      'sql',
      'text',
    ))) {

      // Use original file directory instead of one created during setUp().
      $path = $this->originalFileDirectory . '/simpletest';
      $files = file_scan_directory($path, '/' . $type . '\\-.*/');

      // If size is set then remove any files that are not of that size.
      if ($size !== NULL) {
        foreach ($files as $file) {
          $stats = stat($file->uri);
          if ($stats['size'] != $size) {
            unset($files[$file->uri]);
          }
        }
      }
    }
    usort($files, array(
      $this,
      'drupalCompareFiles',
    ));
    return $files;
  }

  /**
   * Compare two files based on size and file name.
   */
  protected function drupalCompareFiles($file1, $file2) {
    $compare_size = filesize($file1->uri) - filesize($file2->uri);
    if ($compare_size) {

      // Sort by file size.
      return $compare_size;
    }
    else {

      // The files were the same size, so sort alphabetically.
      return strnatcmp($file1->name, $file2->name);
    }
  }

  /**
   * Create a user with a given set of permissions. The permissions correspond to the
   * names given on the privileges page.
   *
   * @param $permissions
   *   Array of permission names to assign to user.
   * @return
   *   A fully loaded user object with pass_raw property, or FALSE if account
   *   creation fails.
   */
  protected function drupalCreateUser($permissions = array(
    'access comments',
    'access content',
    'post comments',
    'post comments without approval',
  )) {

    // Create a role with the given permission set.
    if (!($rid = $this
      ->drupalCreateRole($permissions))) {
      return FALSE;
    }

    // Create a user assigned to that role.
    $edit = array();
    $edit['name'] = $this
      ->randomName();
    $edit['mail'] = $edit['name'] . '@example.com';
    $edit['roles'] = array(
      $rid => $rid,
    );
    $edit['pass'] = user_password();
    $edit['status'] = 1;
    $account = user_save(drupal_anonymous_user(), $edit);
    $this
      ->assertTrue(!empty($account->uid), t('User created with name %name and pass %pass', array(
      '%name' => $edit['name'],
      '%pass' => $edit['pass'],
    )), t('User login'));
    if (empty($account->uid)) {
      return FALSE;
    }

    // Add the raw password so that we can log in as this user.
    $account->pass_raw = $edit['pass'];
    return $account;
  }

  /**
   * Internal helper function; Create a role with specified permissions.
   *
   * @param $permissions
   *   Array of permission names to assign to role.
   * @param $name
   *   (optional) String for the name of the role.  Defaults to a random string.
   * @return
   *   Role ID of newly created role, or FALSE if role creation failed.
   */
  protected function drupalCreateRole(array $permissions, $name = NULL) {

    // Generate random name if it was not passed.
    if (!$name) {
      $name = $this
        ->randomName();
    }

    // Check the all the permissions strings are valid.
    if (!$this
      ->checkPermissions($permissions)) {
      return FALSE;
    }

    // Create new role.
    $role = new stdClass();
    $role->name = $name;
    user_role_save($role);
    user_role_grant_permissions($role->rid, $permissions);
    $this
      ->assertTrue(isset($role->rid), t('Created role of name: @name, id: @rid', array(
      '@name' => $name,
      '@rid' => isset($role->rid) ? $role->rid : t('-n/a-'),
    )), t('Role'));
    if ($role && !empty($role->rid)) {
      $count = db_query('SELECT COUNT(*) FROM {role_permission} WHERE rid = :rid', array(
        ':rid' => $role->rid,
      ))
        ->fetchField();
      $this
        ->assertTrue($count == count($permissions), t('Created permissions: @perms', array(
        '@perms' => implode(', ', $permissions),
      )), t('Role'));
      return $role->rid;
    }
    else {
      return FALSE;
    }
  }

  /**
   * Check to make sure that the array of permissions are valid.
   *
   * @param $permissions
   *   Permissions to check.
   * @param $reset
   *   Reset cached available permissions.
   * @return
   *   TRUE or FALSE depending on whether the permissions are valid.
   */
  protected function checkPermissions(array $permissions, $reset = FALSE) {
    $available =& drupal_static(__FUNCTION__);
    if (!isset($available) || $reset) {
      $available = array_keys(module_invoke_all('permission'));
    }
    $valid = TRUE;
    foreach ($permissions as $permission) {
      if (!in_array($permission, $available)) {
        $this
          ->fail(t('Invalid permission %permission.', array(
          '%permission' => $permission,
        )), t('Role'));
        $valid = FALSE;
      }
    }
    return $valid;
  }

  /**
   * Log in a user with the internal browser.
   *
   * If a user is already logged in, then the current user is logged out before
   * logging in the specified user.
   *
   * Please note that neither the global $user nor the passed in user object is
   * populated with data of the logged in user. If you need full access to the
   * user object after logging in, it must be updated manually. If you also need
   * access to the plain-text password of the user (set by drupalCreateUser()),
   * e.g. to login the same user again, then it must be re-assigned manually.
   * For example:
   * @code
   *   // Create a user.
   *   $account = $this->drupalCreateUser(array());
   *   $this->drupalLogin($account);
   *   // Load real user object.
   *   $pass_raw = $account->pass_raw;
   *   $account = user_load($account->uid);
   *   $account->pass_raw = $pass_raw;
   * @endcode
   *
   * @param $user
   *   User object representing the user to login.
   *
   * @see drupalCreateUser()
   */
  protected function drupalLogin(stdClass $user) {
    if ($this->loggedInUser) {
      $this
        ->drupalLogout();
    }
    $edit = array(
      'name' => $user->name,
      'pass' => $user->pass_raw,
    );
    $this
      ->drupalPost('user', $edit, t('Log in'));

    // If a "log out" link appears on the page, it is almost certainly because
    // the login was successful.
    $pass = $this
      ->assertLink(t('Log out'), 0, t('User %name successfully logged in.', array(
      '%name' => $user->name,
    )), t('User login'));
    if ($pass) {
      $this->loggedInUser = $user;
    }
  }

  /**
   * Generate a token for the currently logged in user.
   */
  protected function drupalGetToken($value = '') {
    $private_key = drupal_get_private_key();
    return md5($this->session_id . $value . $private_key);
  }

  /*
   * Logs a user out of the internal browser, then check the login page to confirm logout.
   */
  protected function drupalLogout() {

    // Make a request to the logout page, and redirect to the user page, the
    // idea being if you were properly logged out you should be seeing a login
    // screen.
    $this
      ->drupalGet('user/logout', array(
      'query' => array(
        'destination' => 'user',
      ),
    ));
    $pass = $this
      ->assertField('name', t('Username field found.'), t('Logout'));
    $pass = $pass && $this
      ->assertField('pass', t('Password field found.'), t('Logout'));
    if ($pass) {
      $this->loggedInUser = FALSE;
    }
  }

  /**
   * Generates a random database prefix, runs the install scripts on the
   * prefixed database and enable the specified modules. After installation
   * many caches are flushed and the internal browser is setup so that the
   * page requests will run on the new prefix. A temporary files directory
   * is created with the same name as the database prefix.
   *
   * @param ...
   *   List of modules to enable for the duration of the test.
   */
  protected function setUp(array $modules = array()) {
    global $db_prefix, $user, $language;

    // Store necessary current values before switching to prefixed database.
    $this->originalLanguage = $language;
    $this->originalLanguageDefault = variable_get('language_default');
    $this->originalPrefix = $db_prefix;
    $this->originalFileDirectory = file_directory_path();
    $this->originalProfile = drupal_get_profile();
    $clean_url_original = variable_get('clean_url', 0);

    // Generate temporary prefixed database to ensure that tests have a clean starting point.
    $db_prefix_new = Database::getConnection()
      ->prefixTables('{simpletest' . mt_rand(1000, 1000000) . '}');
    db_update('simpletest_test_id')
      ->fields(array(
      'last_prefix' => $db_prefix_new,
    ))
      ->condition('test_id', $this->testId)
      ->execute();
    $db_prefix = $db_prefix_new;

    // Create test directory ahead of installation so fatal errors and debug
    // information can be logged during installation process.
    $directory = $this->originalFileDirectory . '/simpletest/' . substr($db_prefix, 10);
    file_prepare_directory($directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);

    // Log fatal errors.
    ini_set('log_errors', 1);
    ini_set('error_log', $directory . '/error.log');
    include_once DRUPAL_ROOT . '/includes/install.inc';
    drupal_install_system();
    $this
      ->preloadRegistry();

    // Include the default profile
    variable_set('install_profile', 'default');
    $profile_details = install_profile_info('default', 'en');

    // Add the specified modules to the list of modules in the default profile.
    // Install the modules specified by the default profile.
    drupal_install_modules($profile_details['dependencies'], TRUE);
    drupal_static_reset('_node_types_build');

    // Install additional modules one at a time in order to make sure that the
    // list of modules is updated between each module's installation.
    foreach ($modules as $module) {
      drupal_install_modules(array(
        $module,
      ), TRUE);
    }

    // Because the schema is static cached, we need to flush
    // it between each run. If we don't, then it will contain
    // stale data for the previous run's database prefix and all
    // calls to it will fail.
    drupal_get_schema(NULL, TRUE);

    // Run default profile tasks.
    $install_state = array();
    drupal_install_modules(array(
      'default',
    ), TRUE);

    // Rebuild caches.
    node_types_rebuild();
    actions_synchronize();
    _drupal_flush_css_js();
    $this
      ->refreshVariables();
    $this
      ->checkPermissions(array(), TRUE);

    // Log in with a clean $user.
    $this->originalUser = $user;
    drupal_save_session(FALSE);
    $user = user_load(1);

    // Restore necessary variables.
    variable_set('install_profile', 'default');
    variable_set('install_task', 'done');
    variable_set('clean_url', $clean_url_original);
    variable_set('site_mail', '[e-mail]');

    // Set up English language.
    unset($GLOBALS['conf']['language_default']);
    $language = language_default();

    // Use the test mail class instead of the default mail handler class.
    variable_set('mail_system', array(
      'default-system' => 'TestingMailSystem',
    ));

    // Use temporary files directory with the same prefix as the database.
    $public_files_directory = $this->originalFileDirectory . '/' . $db_prefix;
    $private_files_directory = $public_files_directory . '/private';

    // Set path variables
    variable_set('file_public_path', $public_files_directory);
    variable_set('file_private_path', $private_files_directory);

    // Create the directories
    $directory = file_directory_path('public');
    file_prepare_directory($directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);
    file_prepare_directory($private_files_directory, FILE_CREATE_DIRECTORY);
    drupal_set_time_limit($this->timeLimit);
  }

  /**
   * This method is called by DrupalWebTestCase::setUp, and preloads the
   * registry from the testing site to cut down on the time it takes to
   * setup a clean environment for the current test run.
   */
  protected function preloadRegistry() {
    db_query('INSERT INTO {registry} SELECT * FROM ' . $this->originalPrefix . 'registry');
    db_query('INSERT INTO {registry_file} SELECT * FROM ' . $this->originalPrefix . 'registry_file');
  }

  /**
   * Refresh the in-memory set of variables. Useful after a page request is made
   * that changes a variable in a different thread.
   *
   * In other words calling a settings page with $this->drupalPost() with a changed
   * value would update a variable to reflect that change, but in the thread that
   * made the call (thread running the test) the changed variable would not be
   * picked up.
   *
   * This method clears the variables cache and loads a fresh copy from the database
   * to ensure that the most up-to-date set of variables is loaded.
   */
  protected function refreshVariables() {
    global $conf;
    cache_clear_all('variables', 'cache');
    $conf = variable_initialize();
  }

  /**
   * Delete created files and temporary files directory, delete the tables created by setUp(),
   * and reset the database prefix.
   */
  protected function tearDown() {
    global $db_prefix, $user, $language;

    // In case a fatal error occured that was not in the test process read the
    // log to pick up any fatal errors.
    $db_prefix_temp = $db_prefix;
    $db_prefix = $this->originalPrefix;
    simpletest_log_read($this->testId, $db_prefix, get_class($this), TRUE);
    $db_prefix = $db_prefix_temp;
    $emailCount = count(variable_get('drupal_test_email_collector', array()));
    if ($emailCount) {
      $message = format_plural($emailCount, t('!count e-mail was sent during this test.'), t('!count e-mails were sent during this test.'), array(
        '!count' => $emailCount,
      ));
      $this
        ->pass($message, t('E-mail'));
    }
    if (preg_match('/simpletest\\d+/', $db_prefix)) {

      // Delete temporary files directory.
      file_unmanaged_delete_recursive($this->originalFileDirectory . '/' . $db_prefix);

      // Remove all prefixed tables (all the tables in the schema).
      $schema = drupal_get_schema(NULL, TRUE);
      $ret = array();
      foreach ($schema as $name => $table) {
        db_drop_table($name);
      }

      // Return the database prefix to the original.
      $db_prefix = $this->originalPrefix;

      // Return the user to the original one.
      $user = $this->originalUser;
      drupal_save_session(TRUE);

      // Ensure that internal logged in variable and cURL options are reset.
      $this->loggedInUser = FALSE;
      $this->additionalCurlOptions = array();

      // Reload module list and implementations to ensure that test module hooks
      // aren't called after tests.
      module_list(TRUE);
      module_implements('', FALSE, TRUE);

      // Reset the Field API.
      field_cache_clear();

      // Rebuild caches.
      $this
        ->refreshVariables();

      // Reset language.
      $language = $this->originalLanguage;
      if ($this->originalLanguageDefault) {
        $GLOBALS['conf']['language_default'] = $this->originalLanguageDefault;
      }

      // Close the CURL handler.
      $this
        ->curlClose();
    }
  }

  /**
   * Initializes the cURL connection.
   *
   * If the simpletest_httpauth_credentials variable is set, this function will
   * add HTTP authentication headers. This is necessary for testing sites that
   * are protected by login credentials from public access.
   * See the description of $curl_options for other options.
   */
  protected function curlInitialize() {
    global $base_url, $db_prefix;
    if (!isset($this->curlHandle)) {
      $this->curlHandle = curl_init();
      $curl_options = $this->additionalCurlOptions + array(
        CURLOPT_COOKIEJAR => $this->cookieFile,
        CURLOPT_URL => $base_url,
        CURLOPT_FOLLOWLOCATION => TRUE,
        CURLOPT_MAXREDIRS => 5,
        CURLOPT_RETURNTRANSFER => TRUE,
        CURLOPT_SSL_VERIFYPEER => FALSE,
        // Required to make the tests run on https.
        CURLOPT_SSL_VERIFYHOST => FALSE,
        // Required to make the tests run on https.
        CURLOPT_HEADERFUNCTION => array(
          &$this,
          'curlHeaderCallback',
        ),
      );
      if (isset($this->httpauth_credentials)) {
        $curl_options[CURLOPT_USERPWD] = $this->httpauth_credentials;
      }
      curl_setopt_array($this->curlHandle, $this->additionalCurlOptions + $curl_options);

      // By default, the child session name should be the same as the parent.
      $this->session_name = session_name();
    }

    // We set the user agent header on each request so as to use the current
    // time and a new uniqid.
    if (preg_match('/simpletest\\d+/', $db_prefix, $matches)) {
      curl_setopt($this->curlHandle, CURLOPT_USERAGENT, drupal_generate_test_ua($matches[0]));
    }
  }

  /**
   * Performs a cURL exec with the specified options after calling curlConnect().
   *
   * @param $curl_options
   *   Custom cURL options.
   * @return
   *   Content returned from the exec.
   */
  protected function curlExec($curl_options) {
    $this
      ->curlInitialize();
    $url = empty($curl_options[CURLOPT_URL]) ? curl_getinfo($this->curlHandle, CURLINFO_EFFECTIVE_URL) : $curl_options[CURLOPT_URL];
    if (!empty($curl_options[CURLOPT_POST])) {

      // This is a fix for the Curl library to prevent Expect: 100-continue
      // headers in POST requests, that may cause unexpected HTTP response
      // codes from some webservers (like lighttpd that returns a 417 error
      // code). It is done by setting an empty "Expect" header field that is
      // not overwritten by Curl.
      $curl_options[CURLOPT_HTTPHEADER][] = 'Expect:';
    }
    curl_setopt_array($this->curlHandle, $this->additionalCurlOptions + $curl_options);

    // Reset headers and the session ID.
    $this->session_id = NULL;
    $this->headers = array();
    $this
      ->drupalSetContent(curl_exec($this->curlHandle), curl_getinfo($this->curlHandle, CURLINFO_EFFECTIVE_URL));
    $message_vars = array(
      '!method' => !empty($curl_options[CURLOPT_NOBODY]) ? 'HEAD' : (empty($curl_options[CURLOPT_POSTFIELDS]) ? 'GET' : 'POST'),
      '@url' => $url,
      '@status' => curl_getinfo($this->curlHandle, CURLINFO_HTTP_CODE),
      '!length' => format_size(strlen($this->content)),
    );
    $message = t('!method @url returned @status (!length).', $message_vars);
    $this
      ->assertTrue($this->content !== FALSE, $message, t('Browser'));
    return $this
      ->drupalGetContent();
  }

  /**
   * Reads headers and registers errors received from the tested site.
   *
   * @see _drupal_log_error().
   *
   * @param $curlHandler
   *   The cURL handler.
   * @param $header
   *   An header.
   */
  protected function curlHeaderCallback($curlHandler, $header) {
    $this->headers[] = $header;

    // Errors are being sent via X-Drupal-Assertion-* headers,
    // generated by _drupal_log_error() in the exact form required
    // by DrupalWebTestCase::error().
    if (preg_match('/^X-Drupal-Assertion-[0-9]+: (.*)$/', $header, $matches)) {

      // Call DrupalWebTestCase::error() with the parameters from the header.
      call_user_func_array(array(
        &$this,
        'error',
      ), unserialize(urldecode($matches[1])));
    }

    // Save cookies.
    if (preg_match('/^Set-Cookie: ([^=]+)=(.+)/', $header, $matches)) {
      $name = $matches[1];
      $parts = array_map('trim', explode(';', $matches[2]));
      $value = array_shift($parts);
      $this->cookies[$name] = array(
        'value' => $value,
        'secure' => in_array('secure', $parts),
      );
      if ($name == $this->session_name) {
        if ($value != 'deleted') {
          $this->session_id = $value;
        }
        else {
          $this->session_id = NULL;
        }
      }
    }

    // This is required by cURL.
    return strlen($header);
  }

  /**
   * Close the cURL handler and unset the handler.
   */
  protected function curlClose() {
    if (isset($this->curlHandle)) {
      curl_close($this->curlHandle);
      unset($this->curlHandle);
    }
  }

  /**
   * Parse content returned from curlExec using DOM and SimpleXML.
   *
   * @return
   *   A SimpleXMLElement or FALSE on failure.
   */
  protected function parse() {
    if (!$this->elements) {

      // DOM can load HTML soup. But, HTML soup can throw warnings, suppress
      // them.
      @($htmlDom = DOMDocument::loadHTML($this->content));
      if ($htmlDom) {
        $this
          ->pass(t('Valid HTML found on "@path"', array(
          '@path' => $this
            ->getUrl(),
        )), t('Browser'));

        // It's much easier to work with simplexml than DOM, luckily enough
        // we can just simply import our DOM tree.
        $this->elements = simplexml_import_dom($htmlDom);
      }
    }
    if (!$this->elements) {
      $this
        ->fail(t('Parsed page successfully.'), t('Browser'));
    }
    return $this->elements;
  }

  /**
   * Retrieves a Drupal path or an absolute path.
   *
   * @param $path
   *   Drupal path or URL to load into internal browser
   * @param $options
   *   Options to be forwarded to url().
   * @param $headers
   *   An array containing additional HTTP request headers, each formatted as
   *   "name: value".
   * @return
   *   The retrieved HTML string, also available as $this->drupalGetContent()
   */
  protected function drupalGet($path, array $options = array(), array $headers = array()) {
    $options['absolute'] = TRUE;

    // We re-using a CURL connection here. If that connection still has certain
    // options set, it might change the GET into a POST. Make sure we clear out
    // previous options.
    $out = $this
      ->curlExec(array(
      CURLOPT_HTTPGET => TRUE,
      CURLOPT_URL => url($path, $options),
      CURLOPT_NOBODY => FALSE,
      CURLOPT_HTTPHEADER => $headers,
    ));
    $this
      ->refreshVariables();

    // Ensure that any changes to variables in the other thread are picked up.
    // Replace original page output with new output from redirected page(s).
    if ($new = $this
      ->checkForMetaRefresh()) {
      $out = $new;
    }
    $this
      ->verbose('GET request to: ' . $path . '<hr />Ending URL: ' . $this
      ->getUrl() . '<hr />' . $out);
    return $out;
  }

  /**
   * Execute a POST request on a Drupal page.
   * It will be done as usual POST request with SimpleBrowser.
   *
   * @param $path
   *   Location of the post form. Either a Drupal path or an absolute path or
   *   NULL to post to the current page. For multi-stage forms you can set the
   *   path to NULL and have it post to the last received page. Example:
   *
   *   // First step in form.
   *   $edit = array(...);
   *   $this->drupalPost('some_url', $edit, t('Save'));
   *
   *   // Second step in form.
   *   $edit = array(...);
   *   $this->drupalPost(NULL, $edit, t('Save'));
   * @param  $edit
   *   Field data in an associative array. Changes the current input fields
   *   (where possible) to the values indicated. A checkbox can be set to
   *   TRUE to be checked and FALSE to be unchecked. Note that when a form
   *   contains file upload fields, other fields cannot start with the '@'
   *   character.
   *
   *   Multiple select fields can be set using name[] and setting each of the
   *   possible values. Example:
   *   $edit = array();
   *   $edit['name[]'] = array('value1', 'value2');
   * @param $submit
   *   Value of the submit button.
   * @param $options
   *   Options to be forwarded to url().
   * @param $headers
   *   An array containing additional HTTP request headers, each formatted as
   *   "name: value".
   */
  protected function drupalPost($path, $edit, $submit, array $options = array(), array $headers = array()) {
    $submit_matches = FALSE;
    if (isset($path)) {
      $html = $this
        ->drupalGet($path, $options);
    }
    if ($this
      ->parse()) {
      $edit_save = $edit;

      // Let's iterate over all the forms.
      $forms = $this
        ->xpath('//form');
      foreach ($forms as $form) {

        // We try to set the fields of this form as specified in $edit.
        $edit = $edit_save;
        $post = array();
        $upload = array();
        $submit_matches = $this
          ->handleForm($post, $edit, $upload, $submit, $form);
        $action = isset($form['action']) ? $this
          ->getAbsoluteUrl($form['action']) : $this
          ->getUrl();

        // We post only if we managed to handle every field in edit and the
        // submit button matches.
        if (!$edit && $submit_matches) {
          $post_array = $post;
          if ($upload) {

            // TODO: cURL handles file uploads for us, but the implementation
            // is broken. This is a less than elegant workaround. Alternatives
            // are being explored at #253506.
            foreach ($upload as $key => $file) {
              $file = drupal_realpath($file);
              if ($file && is_file($file)) {
                $post[$key] = '@' . $file;
              }
            }
          }
          else {
            foreach ($post as $key => $value) {

              // Encode according to application/x-www-form-urlencoded
              // Both names and values needs to be urlencoded, according to
              // http://www.w3.org/TR/html4/interact/forms.html#h-17.13.4.1
              $post[$key] = urlencode($key) . '=' . urlencode($value);
            }
            $post = implode('&', $post);
          }
          $out = $this
            ->curlExec(array(
            CURLOPT_URL => $action,
            CURLOPT_POST => TRUE,
            CURLOPT_POSTFIELDS => $post,
            CURLOPT_HTTPHEADER => $headers,
          ));

          // Ensure that any changes to variables in the other thread are picked up.
          $this
            ->refreshVariables();

          // Replace original page output with new output from redirected page(s).
          if ($new = $this
            ->checkForMetaRefresh()) {
            $out = $new;
          }
          $this
            ->verbose('POST request to: ' . $path . '<hr />Ending URL: ' . $this
            ->getUrl() . '<hr />Fields: ' . highlight_string('<?php ' . var_export($post_array, TRUE), TRUE) . '<hr />' . $out);
          return $out;
        }
      }

      // We have not found a form which contained all fields of $edit.
      foreach ($edit as $name => $value) {
        $this
          ->fail(t('Failed to set field @name to @value', array(
          '@name' => $name,
          '@value' => $value,
        )));
      }
      $this
        ->assertTrue($submit_matches, t('Found the @submit button', array(
        '@submit' => $submit,
      )));
      $this
        ->fail(t('Found the requested form fields at @path', array(
        '@path' => $path,
      )));
    }
  }

  /**
   * Runs cron in the Drupal installed by Simpletest.
   */
  protected function cronRun() {
    $this
      ->drupalGet($GLOBALS['base_url'] . '/cron.php', array(
      'external' => TRUE,
      'query' => array(
        'cron_key' => variable_get('cron_key', 'drupal'),
      ),
    ));
  }

  /**
   * Check for meta refresh tag and if found call drupalGet() recursively. This
   * function looks for the http-equiv attribute to be set to "Refresh"
   * and is case-sensitive.
   *
   * @return
   *   Either the new page content or FALSE.
   */
  protected function checkForMetaRefresh() {
    if ($this
      ->drupalGetContent() != '' && $this
      ->parse()) {
      $refresh = $this
        ->xpath('//meta[@http-equiv="Refresh"]');
      if (!empty($refresh)) {

        // Parse the content attribute of the meta tag for the format:
        // "[delay]: URL=[page_to_redirect_to]".
        if (preg_match('/\\d+;\\s*URL=(?P<url>.*)/i', $refresh[0]['content'], $match)) {
          return $this
            ->drupalGet($this
            ->getAbsoluteUrl(decode_entities($match['url'])));
        }
      }
    }
    return FALSE;
  }

  /**
   * Retrieves only the headers for a Drupal path or an absolute path.
   *
   * @param $path
   *   Drupal path or URL to load into internal browser
   * @param $options
   *   Options to be forwarded to url().
   * @param $headers
   *   An array containing additional HTTP request headers, each formatted as
   *   "name: value".
   * @return
   *   The retrieved headers, also available as $this->drupalGetContent()
   */
  protected function drupalHead($path, array $options = array(), array $headers = array()) {
    $options['absolute'] = TRUE;
    $out = $this
      ->curlExec(array(
      CURLOPT_NOBODY => TRUE,
      CURLOPT_URL => url($path, $options),
      CURLOPT_HTTPHEADER => $headers,
    ));
    $this
      ->refreshVariables();

    // Ensure that any changes to variables in the other thread are picked up.
    return $out;
  }

  /**
   * Handle form input related to drupalPost(). Ensure that the specified fields
   * exist and attempt to create POST data in the correct manner for the particular
   * field type.
   *
   * @param $post
   *   Reference to array of post values.
   * @param $edit
   *   Reference to array of edit values to be checked against the form.
   * @param $submit
   *   Form submit button value.
   * @param $form
   *   Array of form elements.
   * @return
   *   Submit value matches a valid submit input in the form.
   */
  protected function handleForm(&$post, &$edit, &$upload, $submit, $form) {

    // Retrieve the form elements.
    $elements = $form
      ->xpath('.//input|.//textarea|.//select');
    $submit_matches = FALSE;
    foreach ($elements as $element) {

      // SimpleXML objects need string casting all the time.
      $name = (string) $element['name'];

      // This can either be the type of <input> or the name of the tag itself
      // for <select> or <textarea>.
      $type = isset($element['type']) ? (string) $element['type'] : $element
        ->getName();
      $value = isset($element['value']) ? (string) $element['value'] : '';
      $done = FALSE;
      if (isset($edit[$name])) {
        switch ($type) {
          case 'text':
          case 'textarea':
          case 'hidden':
          case 'password':
            $post[$name] = $edit[$name];
            unset($edit[$name]);
            break;
          case 'radio':
            if ($edit[$name] == $value) {
              $post[$name] = $edit[$name];
              unset($edit[$name]);
            }
            break;
          case 'checkbox':

            // To prevent checkbox from being checked.pass in a FALSE,
            // otherwise the checkbox will be set to its value regardless
            // of $edit.
            if ($edit[$name] === FALSE) {
              unset($edit[$name]);
              continue 2;
            }
            else {
              unset($edit[$name]);
              $post[$name] = $value;
            }
            break;
          case 'select':
            $new_value = $edit[$name];
            $index = 0;
            $key = preg_replace('/\\[\\]$/', '', $name);
            $options = $this
              ->getAllOptions($element);
            foreach ($options as $option) {
              if (is_array($new_value)) {
                $option_value = (string) $option['value'];
                if (in_array($option_value, $new_value)) {
                  $post[$key . '[' . $index++ . ']'] = $option_value;
                  $done = TRUE;
                  unset($edit[$name]);
                }
              }
              elseif ($new_value == $option['value']) {
                $post[$name] = $new_value;
                unset($edit[$name]);
                $done = TRUE;
              }
            }
            break;
          case 'file':
            $upload[$name] = $edit[$name];
            unset($edit[$name]);
            break;
        }
      }
      if (!isset($post[$name]) && !$done) {
        switch ($type) {
          case 'textarea':
            $post[$name] = (string) $element;
            break;
          case 'select':
            $single = empty($element['multiple']);
            $first = TRUE;
            $index = 0;
            $key = preg_replace('/\\[\\]$/', '', $name);
            $options = $this
              ->getAllOptions($element);
            foreach ($options as $option) {

              // For single select, we load the first option, if there is a
              // selected option that will overwrite it later.
              if ($option['selected'] || $first && $single) {
                $first = FALSE;
                if ($single) {
                  $post[$name] = (string) $option['value'];
                }
                else {
                  $post[$key . '[' . $index++ . ']'] = (string) $option['value'];
                }
              }
            }
            break;
          case 'file':
            break;
          case 'submit':
          case 'image':
            if ($submit == $value) {
              $post[$name] = $value;
              $submit_matches = TRUE;
            }
            break;
          case 'radio':
          case 'checkbox':
            if (!isset($element['checked'])) {
              break;
            }

          // Deliberate no break.
          default:
            $post[$name] = $value;
        }
      }
    }
    return $submit_matches;
  }

  /**
   * Perform an xpath search on the contents of the internal browser. The search
   * is relative to the root element (HTML tag normally) of the page.
   *
   * @param $xpath
   *   The xpath string to use in the search.
   * @return
   *   The return value of the xpath search. For details on the xpath string
   *   format and return values see the SimpleXML documentation,
   *   http://us.php.net/manual/function.simplexml-element-xpath.php.
   */
  protected function xpath($xpath) {
    if ($this
      ->parse()) {
      return $this->elements
        ->xpath($xpath);
    }
    return FALSE;
  }

  /**
   * Get all option elements, including nested options, in a select.
   *
   * @param $element
   *   The element for which to get the options.
   * @return
   *   Option elements in select.
   */
  protected function getAllOptions(SimpleXMLElement $element) {
    $options = array();

    // Add all options items.
    foreach ($element->option as $option) {
      $options[] = $option;
    }

    // Search option group children.
    if (isset($element->optgroup)) {
      foreach ($element->optgroup as $group) {
        $options = array_merge($options, $this
          ->getAllOptions($group));
      }
    }
    return $options;
  }

  /**
   * Pass if a link with the specified label is found, and optional with the
   * specified index.
   *
   * @param $label
   *   Text between the anchor tags.
   * @param $index
   *   Link position counting from zero.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to, defaults to 'Other'.
   * @return
   *   TRUE if the assertion succeeded, FALSE otherwise.
   */
  protected function assertLink($label, $index = 0, $message = '', $group = 'Other') {
    $links = $this
      ->xpath('//a[text()="' . $label . '"]');
    $message = $message ? $message : t('Link with label %label found.', array(
      '%label' => $label,
    ));
    return $this
      ->assert(isset($links[$index]), $message, $group);
  }

  /**
   * Pass if a link with the specified label is not found.
   *
   * @param $label
   *   Text between the anchor tags.
   * @param $index
   *   Link position counting from zero.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to, defaults to 'Other'.
   * @return
   *   TRUE if the assertion succeeded, FALSE otherwise.
   */
  protected function assertNoLink($label, $message = '', $group = 'Other') {
    $links = $this
      ->xpath('//a[text()="' . $label . '"]');
    $message = $message ? $message : t('Link with label %label not found.', array(
      '%label' => $label,
    ));
    return $this
      ->assert(empty($links), $message, $group);
  }

  /**
   * Follows a link by name.
   *
   * Will click the first link found with this link text by default, or a
   * later one if an index is given. Match is case insensitive with
   * normalized space. The label is translated label. There is an assert
   * for successful click.
   *
   * @param $label
   *   Text between the anchor tags.
   * @param $index
   *   Link position counting from zero.
   * @return
   *   Page on success, or FALSE on failure.
   */
  protected function clickLink($label, $index = 0) {
    $url_before = $this
      ->getUrl();
    $urls = $this
      ->xpath('//a[text()="' . $label . '"]');
    if (isset($urls[$index])) {
      $url_target = $this
        ->getAbsoluteUrl($urls[$index]['href']);
    }
    $this
      ->assertTrue(isset($urls[$index]), t('Clicked link %label (@url_target) from @url_before', array(
      '%label' => $label,
      '@url_target' => $url_target,
      '@url_before' => $url_before,
    )), t('Browser'));
    if (isset($url_target)) {
      return $this
        ->drupalGet($url_target);
    }
    return FALSE;
  }

  /**
   * Takes a path and returns an absolute path.
   *
   * @param $path
   *   A path from the internal browser content.
   * @return
   *   The $path with $base_url prepended, if necessary.
   */
  protected function getAbsoluteUrl($path) {
    global $base_url, $base_path;
    $parts = parse_url($path);
    if (empty($parts['host'])) {

      // Ensure that we have a string (and no xpath object).
      $path = (string) $path;

      // Strip $base_path, if existent.
      $length = strlen($base_path);
      if (substr($path, 0, $length) === $base_path) {
        $path = substr($path, $length);
      }

      // Ensure that we have an absolute path.
      if ($path[0] !== '/') {
        $path = '/' . $path;
      }

      // Finally, prepend the $base_url.
      $path = $base_url . $path;
    }
    return $path;
  }

  /**
   * Get the current url from the cURL handler.
   *
   * @return
   *   The current url.
   */
  protected function getUrl() {
    return $this->url;
  }

  /**
   * Gets the HTTP response headers of the requested page. Normally we are only
   * interested in the headers returned by the last request. However, if a page
   * is redirected or HTTP authentication is in use, multiple requests will be
   * required to retrieve the page. Headers from all requests may be requested
   * by passing TRUE to this function.
   *
   * @param $all_requests
   *   Boolean value specifying whether to return headers from all requests
   *   instead of just the last request. Defaults to FALSE.
   * @return
   *   A name/value array if headers from only the last request are requested.
   *   If headers from all requests are requested, an array of name/value
   *   arrays, one for each request.
   *
   *   The pseudonym ":status" is used for the HTTP status line.
   *
   *   Values for duplicate headers are stored as a single comma-separated list.
   */
  protected function drupalGetHeaders($all_requests = FALSE) {
    $request = 0;
    $headers = array(
      $request => array(),
    );
    foreach ($this->headers as $header) {
      $header = trim($header);
      if ($header === '') {
        $request++;
      }
      else {
        if (strpos($header, 'HTTP/') === 0) {
          $name = ':status';
          $value = $header;
        }
        else {
          list($name, $value) = explode(':', $header, 2);
          $name = strtolower($name);
        }
        if (isset($headers[$request][$name])) {
          $headers[$request][$name] .= ',' . trim($value);
        }
        else {
          $headers[$request][$name] = trim($value);
        }
      }
    }
    if (!$all_requests) {
      $headers = array_pop($headers);
    }
    return $headers;
  }

  /**
   * Gets the value of an HTTP response header. If multiple requests were
   * required to retrieve the page, only the headers from the last request will
   * be checked by default. However, if TRUE is passed as the second argument,
   * all requests will be processed from last to first until the header is
   * found.
   *
   * @param $name
   *   The name of the header to retrieve. Names are case-insensitive (see RFC
   *   2616 section 4.2).
   * @param $all_requests
   *   Boolean value specifying whether to check all requests if the header is
   *   not found in the last request. Defaults to FALSE.
   * @return
   *   The HTTP header value or FALSE if not found.
   */
  protected function drupalGetHeader($name, $all_requests = FALSE) {
    $name = strtolower($name);
    $header = FALSE;
    if ($all_requests) {
      foreach (array_reverse($this
        ->drupalGetHeaders(TRUE)) as $headers) {
        if (isset($headers[$name])) {
          $header = $headers[$name];
          break;
        }
      }
    }
    else {
      $headers = $this
        ->drupalGetHeaders();
      if (isset($headers[$name])) {
        $header = $headers[$name];
      }
    }
    return $header;
  }

  /**
   * Gets the current raw HTML of requested page.
   */
  protected function drupalGetContent() {
    return $this->content;
  }

  /**
   * Gets an array containing all e-mails sent during this test case.
   *
   * @param $filter
   *   An array containing key/value pairs used to filter the e-mails that are returned.
   * @return
   *   An array containing e-mail messages captured during the current test.
   */
  protected function drupalGetMails($filter = array()) {
    $captured_emails = variable_get('drupal_test_email_collector', array());
    $filtered_emails = array();
    foreach ($captured_emails as $message) {
      foreach ($filter as $key => $value) {
        if (!isset($message[$key]) || $message[$key] != $value) {
          continue 2;
        }
      }
      $filtered_emails[] = $message;
    }
    return $filtered_emails;
  }

  /**
   * Sets the raw HTML content. This can be useful when a page has been fetched
   * outside of the internal browser and assertions need to be made on the
   * returned page.
   *
   * A good example would be when testing drupal_http_request(). After fetching
   * the page the content can be set and page elements can be checked to ensure
   * that the function worked properly.
   */
  protected function drupalSetContent($content, $url = 'internal:') {
    $this->content = $content;
    $this->url = $url;
    $this->plainTextContent = FALSE;
    $this->elements = FALSE;
  }

  /**
   * Pass if the raw text IS found on the loaded page, fail otherwise. Raw text
   * refers to the raw HTML that the page generated.
   *
   * @param $raw
   *   Raw (HTML) string to look for.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to, defaults to 'Other'.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertRaw($raw, $message = '', $group = 'Other') {
    if (!$message) {
      $message = t('Raw "@raw" found', array(
        '@raw' => $raw,
      ));
    }
    return $this
      ->assert(strpos($this->content, $raw) !== FALSE, $message, $group);
  }

  /**
   * Pass if the raw text is NOT found on the loaded page, fail otherwise. Raw text
   * refers to the raw HTML that the page generated.
   *
   * @param $raw
   *   Raw (HTML) string to look for.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to, defaults to 'Other'.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertNoRaw($raw, $message = '', $group = 'Other') {
    if (!$message) {
      $message = t('Raw "@raw" not found', array(
        '@raw' => $raw,
      ));
    }
    return $this
      ->assert(strpos($this->content, $raw) === FALSE, $message, $group);
  }

  /**
   * Pass if the text IS found on the text version of the page. The text version
   * is the equivalent of what a user would see when viewing through a web browser.
   * In other words the HTML has been filtered out of the contents.
   *
   * @param $text
   *   Plain text to look for.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to, defaults to 'Other'.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertText($text, $message = '', $group = 'Other') {
    return $this
      ->assertTextHelper($text, $message, $group, FALSE);
  }

  /**
   * Pass if the text is NOT found on the text version of the page. The text version
   * is the equivalent of what a user would see when viewing through a web browser.
   * In other words the HTML has been filtered out of the contents.
   *
   * @param $text
   *   Plain text to look for.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to, defaults to 'Other'.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertNoText($text, $message = '', $group = 'Other') {
    return $this
      ->assertTextHelper($text, $message, $group, TRUE);
  }

  /**
   * Helper for assertText and assertNoText.
   *
   * It is not recommended to call this function directly.
   *
   * @param $text
   *   Plain text to look for.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to.
   * @param $not_exists
   *   TRUE if this text should not exist, FALSE if it should.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertTextHelper($text, $message, $group, $not_exists) {
    if ($this->plainTextContent === FALSE) {
      $this->plainTextContent = filter_xss($this->content, array());
    }
    if (!$message) {
      $message = !$not_exists ? t('"@text" found', array(
        '@text' => $text,
      )) : t('"@text" not found', array(
        '@text' => $text,
      ));
    }
    return $this
      ->assert($not_exists == (strpos($this->plainTextContent, $text) === FALSE), $message, $group);
  }

  /**
   * Pass if the text is found ONLY ONCE on the text version of the page.
   *
   * The text version is the equivalent of what a user would see when viewing
   * through a web browser. In other words the HTML has been filtered out of
   * the contents.
   *
   * @param $text
   *   Plain text to look for.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to, defaults to 'Other'.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertUniqueText($text, $message = '', $group = 'Other') {
    return $this
      ->assertUniqueTextHelper($text, $message, $group, TRUE);
  }

  /**
   * Pass if the text is found MORE THAN ONCE on the text version of the page.
   *
   * The text version is the equivalent of what a user would see when viewing
   * through a web browser. In other words the HTML has been filtered out of
   * the contents.
   *
   * @param $text
   *   Plain text to look for.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to, defaults to 'Other'.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertNoUniqueText($text, $message = '', $group = 'Other') {
    return $this
      ->assertUniqueTextHelper($text, $message, $group, FALSE);
  }

  /**
   * Helper for assertUniqueText and assertNoUniqueText.
   *
   * It is not recommended to call this function directly.
   *
   * @param $text
   *   Plain text to look for.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to.
   * @param $be_unique
   *   TRUE if this text should be found only once, FALSE if it should be found more than once.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertUniqueTextHelper($text, $message, $group, $be_unique) {
    if ($this->plainTextContent === FALSE) {
      $this->plainTextContent = filter_xss($this->content, array());
    }
    if (!$message) {
      $message = '"' . $text . '"' . ($be_unique ? ' found only once' : ' found more than once');
    }
    $first_occurance = strpos($this->plainTextContent, $text);
    if ($first_occurance === FALSE) {
      return $this
        ->assert(FALSE, $message, $group);
    }
    $offset = $first_occurance + strlen($text);
    $second_occurance = strpos($this->plainTextContent, $text, $offset);
    return $this
      ->assert($be_unique == ($second_occurance === FALSE), $message, $group);
  }

  /**
   * Will trigger a pass if the Perl regex pattern is found in the raw content.
   *
   * @param $pattern
   *   Perl regex to look for including the regex delimiters.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertPattern($pattern, $message = '', $group = 'Other') {
    if (!$message) {
      $message = t('Pattern "@pattern" found', array(
        '@pattern' => $pattern,
      ));
    }
    return $this
      ->assert((bool) preg_match($pattern, $this
      ->drupalGetContent()), $message, $group);
  }

  /**
   * Will trigger a pass if the perl regex pattern is not present in raw content.
   *
   * @param $pattern
   *   Perl regex to look for including the regex delimiters.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertNoPattern($pattern, $message = '', $group = 'Other') {
    if (!$message) {
      $message = t('Pattern "@pattern" not found', array(
        '@pattern' => $pattern,
      ));
    }
    return $this
      ->assert(!preg_match($pattern, $this
      ->drupalGetContent()), $message, $group);
  }

  /**
   * Pass if the page title is the given string.
   *
   * @param $title
   *   The string the title should be.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertTitle($title, $message, $group = 'Other') {
    return $this
      ->assertEqual(current($this
      ->xpath('//title')), $title, $message, $group);
  }

  /**
   * Pass if the page title is not the given string.
   *
   * @param $title
   *   The string the title should not be.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertNoTitle($title, $message, $group = 'Other') {
    return $this
      ->assertNotEqual(current($this
      ->xpath('//title')), $title, $message, $group);
  }

  /**
   * Assert that a field exists in the current page by the given XPath.
   *
   * @param $xpath
   *   XPath used to find the field.
   * @param $value
   *   Value of the field to assert.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertFieldByXPath($xpath, $value, $message, $group = 'Other') {
    $fields = $this
      ->xpath($xpath);

    // If value specified then check array for match.
    $found = TRUE;
    if ($value) {
      $found = FALSE;
      if ($fields) {
        foreach ($fields as $field) {
          if (isset($field['value']) && $field['value'] == $value) {

            // Input element with correct value.
            $found = TRUE;
          }
          elseif (isset($field->option)) {

            // Select element found.
            if ($this
              ->getSelectedItem($field) == $value) {
              $found = TRUE;
            }
            else {

              // No item selected so use first item.
              $items = $this
                ->getAllOptions($field);
              if (!empty($items) && $items[0]['value'] == $value) {
                $found = TRUE;
              }
            }
          }
          elseif ((string) $field == $value) {

            // Text area with correct text.
            $found = TRUE;
          }
        }
      }
    }
    return $this
      ->assertTrue($fields && $found, $message, $group);
  }

  /**
   * Get the selected value from a select field.
   *
   * @param $element
   *   SimpleXMLElement select element.
   * @return
   *   The selected value or FALSE.
   */
  protected function getSelectedItem(SimpleXMLElement $element) {
    foreach ($element
      ->children() as $item) {
      if (isset($item['selected'])) {
        return $item['value'];
      }
      elseif ($item
        ->getName() == 'optgroup') {
        if ($value = $this
          ->getSelectedItem($item)) {
          return $value;
        }
      }
    }
    return FALSE;
  }

  /**
   * Assert that a field does not exist in the current page by the given XPath.
   *
   * @param $xpath
   *   XPath used to find the field.
   * @param $value
   *   Value of the field to assert.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertNoFieldByXPath($xpath, $value, $message, $group = 'Other') {
    $fields = $this
      ->xpath($xpath);

    // If value specified then check array for match.
    $found = TRUE;
    if ($value) {
      $found = FALSE;
      if ($fields) {
        foreach ($fields as $field) {
          if ($field['value'] == $value) {
            $found = TRUE;
          }
        }
      }
    }
    return $this
      ->assertFalse($fields && $found, $message, $group);
  }

  /**
   * Assert that a field exists in the current page with the given name and value.
   *
   * @param $name
   *   Name of field to assert.
   * @param $value
   *   Value of the field to assert.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertFieldByName($name, $value = '', $message = '') {
    return $this
      ->assertFieldByXPath($this
      ->constructFieldXpath('name', $name), $value, $message ? $message : t('Found field by name @name', array(
      '@name' => $name,
    )), t('Browser'));
  }

  /**
   * Assert that a field does not exist with the given name and value.
   *
   * @param $name
   *   Name of field to assert.
   * @param $value
   *   Value of the field to assert.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertNoFieldByName($name, $value = '', $message = '') {
    return $this
      ->assertNoFieldByXPath($this
      ->constructFieldXpath('name', $name), $value, $message ? $message : t('Did not find field by name @name', array(
      '@name' => $name,
    )), t('Browser'));
  }

  /**
   * Assert that a field exists in the current page with the given id and value.
   *
   * @param $id
   *   Id of field to assert.
   * @param $value
   *   Value of the field to assert.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertFieldById($id, $value = '', $message = '') {
    return $this
      ->assertFieldByXPath($this
      ->constructFieldXpath('id', $id), $value, $message ? $message : t('Found field by id @id', array(
      '@id' => $id,
    )), t('Browser'));
  }

  /**
   * Assert that a field does not exist with the given id and value.
   *
   * @param $id
   *   Id of field to assert.
   * @param $value
   *   Value of the field to assert.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertNoFieldById($id, $value = '', $message = '') {
    return $this
      ->assertNoFieldByXPath($this
      ->constructFieldXpath('id', $id), $value, $message ? $message : t('Did not find field by id @id', array(
      '@id' => $id,
    )), t('Browser'));
  }

  /**
   * Assert that a checkbox field in the current page is checked.
   *
   * @param $id
   *   Id of field to assert.
   * @param $message
   *   Message to display.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertFieldChecked($id, $message = '') {
    $elements = $this
      ->xpath('//input[@id="' . $id . '"]');
    return $this
      ->assertTrue(isset($elements[0]) && !empty($elements[0]['checked']), $message ? $message : t('Checkbox field @id is checked.', array(
      '@id' => $id,
    )), t('Browser'));
  }

  /**
   * Assert that a checkbox field in the current page is not checked.
   *
   * @param $id
   *   Id of field to assert.
   * @param $message
   *   Message to display.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertNoFieldChecked($id, $message = '') {
    $elements = $this
      ->xpath('//input[@id="' . $id . '"]');
    return $this
      ->assertTrue(isset($elements[0]) && empty($elements[0]['checked']), $message ? $message : t('Checkbox field @id is not checked.', array(
      '@id' => $id,
    )), t('Browser'));
  }

  /**
   * Assert that a field exists with the given name or id.
   *
   * @param $field
   *   Name or id of field to assert.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertField($field, $message = '', $group = 'Other') {
    return $this
      ->assertFieldByXPath($this
      ->constructFieldXpath('name', $field) . '|' . $this
      ->constructFieldXpath('id', $field), '', $message, $group);
  }

  /**
   * Assert that a field does not exist with the given name or id.
   *
   * @param $field
   *   Name or id of field to assert.
   * @param $message
   *   Message to display.
   * @param $group
   *   The group this message belongs to.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertNoField($field, $message = '', $group = 'Other') {
    return $this
      ->assertNoFieldByXPath($this
      ->constructFieldXpath('name', $field) . '|' . $this
      ->constructFieldXpath('id', $field), '', $message, $group);
  }

  /**
   * Helper function: construct an XPath for the given set of attributes and value.
   *
   * @param $attribute
   *   Field attributes.
   * @param $value
   *   Value of field.
   * @return
   *   XPath for specified values.
   */
  protected function constructFieldXpath($attribute, $value) {
    return '//textarea[@' . $attribute . '="' . $value . '"]|//input[@' . $attribute . '="' . $value . '"]|//select[@' . $attribute . '="' . $value . '"]';
  }

  /**
   * Assert the page responds with the specified response code.
   *
   * @param $code
   *   Response code. For example 200 is a successful page request. For a list
   *   of all codes see http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html.
   * @param $message
   *   Message to display.
   * @return
   *   Assertion result.
   */
  protected function assertResponse($code, $message = '') {
    $curl_code = curl_getinfo($this->curlHandle, CURLINFO_HTTP_CODE);
    $match = is_array($code) ? in_array($curl_code, $code) : $curl_code == $code;
    return $this
      ->assertTrue($match, $message ? $message : t('HTTP response expected !code, actual !curl_code', array(
      '!code' => $code,
      '!curl_code' => $curl_code,
    )), t('Browser'));
  }

  /**
   * Assert that the most recently sent e-mail message has a field with the given value.
   *
   * @param $name
   *   Name of field or message property to assert. Examples: subject, body, id, ...
   * @param $value
   *   Value of the field to assert.
   * @param $message
   *   Message to display.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function assertMail($name, $value = '', $message = '') {
    $captured_emails = variable_get('drupal_test_email_collector', array());
    $email = end($captured_emails);
    return $this
      ->assertTrue($email && isset($email[$name]) && $email[$name] == $value, $message, t('E-mail'));
  }

  /**
   * Log verbose message in a text file.
   *
   * The a link to the vebose message will be placed in the test results via
   * as a passing assertion with the text '[verbose message]'.
   *
   * @param $message
   *   The verbose message to be stored.
   * @see simpletest_verbose()
   */
  protected function verbose($message) {
    if ($id = simpletest_verbose($message)) {
      $url = file_create_url($this->originalFileDirectory . '/simpletest/verbose/' . get_class($this) . '-' . $id . '.html');
      $this
        ->error(l(t('Verbose message'), $url, array(
        'attributes' => array(
          'target' => '_blank',
        ),
      )), 'User notice');
    }
  }

}

Members

Name	Modifiers	Type	Description	Overrides
DrupalTestCase::$assertions	protected	property	Assertions thrown in that test case.
DrupalTestCase::$originalFileDirectory	protected	property	The original file directory, before it was changed for testing purposes.
DrupalTestCase::$originalPrefix	protected	property	The original database prefix, before it was changed for testing purposes.
DrupalTestCase::$results	public	property	Current results of this test case.
DrupalTestCase::$skipClasses	protected	property	This class is skipped when looking for the source of an assertion.
DrupalTestCase::$testId	protected	property	The test run ID.
DrupalTestCase::$timeLimit	protected	property	Time limit for the test.
DrupalTestCase::assert	protected	function	Internal helper: stores the assert.
DrupalTestCase::assertEqual	protected	function	Check to see if two values are equal.
DrupalTestCase::assertFalse	protected	function	Check to see if a value is false (an empty string, 0, NULL, or FALSE).
DrupalTestCase::assertIdentical	protected	function	Check to see if two values are identical.
DrupalTestCase::assertNotEqual	protected	function	Check to see if two values are not equal.
DrupalTestCase::assertNotIdentical	protected	function	Check to see if two values are not identical.
DrupalTestCase::assertNotNull	protected	function	Check to see if a value is not NULL.
DrupalTestCase::assertNull	protected	function	Check to see if a value is NULL.
DrupalTestCase::assertTrue	protected	function	Check to see if a value is not false (not an empty string, 0, NULL, or FALSE).
DrupalTestCase::error	protected	function	Fire an error assertion.	1
DrupalTestCase::errorHandler	public	function	Handle errors.
DrupalTestCase::exceptionHandler	protected	function	Handle exceptions.
DrupalTestCase::fail	protected	function	Fire an assertion that is always negative.
DrupalTestCase::getAssertionCall	protected	function	Cycles through backtrace until the first non-assertion method is found.
DrupalTestCase::insertAssert	public static	function	Store an assertion from outside the testing context.
DrupalTestCase::pass	protected	function	Fire an assertion that is always positive.
DrupalTestCase::randomName	public static	function	Generates a random string containing letters and numbers.
DrupalTestCase::randomString	public static	function	Generates a random string of ASCII characters of codes 32 to 126.
DrupalTestCase::run	public	function	Run all tests in this class.
DrupalWebTestCase::$additionalCurlOptions	protected	property	Additional cURL options.
DrupalWebTestCase::$content	protected	property	The content of the page currently loaded in the internal browser.
DrupalWebTestCase::$cookieFile	protected	property	The current cookie file used by cURL.
DrupalWebTestCase::$curlHandle	protected	property	The handle of the current cURL connection.
DrupalWebTestCase::$elements	protected	property	The parsed version of the page.
DrupalWebTestCase::$headers	protected	property	The headers of the page currently loaded in the internal browser.
DrupalWebTestCase::$httpauth_credentials	protected	property	HTTP authentication credentials (<username>:<password>).
DrupalWebTestCase::$loggedInUser	protected	property	The current user logged in using the internal browser.
DrupalWebTestCase::$originalUser	protected	property	The original user, before it was changed to a clean uid = 1 for testing purposes.
DrupalWebTestCase::$plainTextContent	protected	property	The content of the page currently loaded in the internal browser (plain text version).
DrupalWebTestCase::$session_id	protected	property	The current session ID, if available.
DrupalWebTestCase::$session_name	protected	property	The current session name, if available.
DrupalWebTestCase::$url	protected	property	The URL currently loaded in the internal browser.
DrupalWebTestCase::assertField	protected	function	Assert that a field exists with the given name or id.
DrupalWebTestCase::assertFieldById	protected	function	Assert that a field exists in the current page with the given id and value.
DrupalWebTestCase::assertFieldByName	protected	function	Assert that a field exists in the current page with the given name and value.
DrupalWebTestCase::assertFieldByXPath	protected	function	Assert that a field exists in the current page by the given XPath.
DrupalWebTestCase::assertFieldChecked	protected	function	Assert that a checkbox field in the current page is checked.
DrupalWebTestCase::assertLink	protected	function	Pass if a link with the specified label is found, and optional with the specified index.
DrupalWebTestCase::assertMail	protected	function	Assert that the most recently sent e-mail message has a field with the given value.
DrupalWebTestCase::assertNoField	protected	function	Assert that a field does not exist with the given name or id.
DrupalWebTestCase::assertNoFieldById	protected	function	Assert that a field does not exist with the given id and value.
DrupalWebTestCase::assertNoFieldByName	protected	function	Assert that a field does not exist with the given name and value.
DrupalWebTestCase::assertNoFieldByXPath	protected	function	Assert that a field does not exist in the current page by the given XPath.
DrupalWebTestCase::assertNoFieldChecked	protected	function	Assert that a checkbox field in the current page is not checked.
DrupalWebTestCase::assertNoLink	protected	function	Pass if a link with the specified label is not found.
DrupalWebTestCase::assertNoPattern	protected	function	Will trigger a pass if the perl regex pattern is not present in raw content.
DrupalWebTestCase::assertNoRaw	protected	function	Pass if the raw text is NOT found on the loaded page, fail otherwise. Raw text refers to the raw HTML that the page generated.
DrupalWebTestCase::assertNoText	protected	function	Pass if the text is NOT found on the text version of the page. The text version is the equivalent of what a user would see when viewing through a web browser. In other words the HTML has been filtered out of the contents.
DrupalWebTestCase::assertNoTitle	protected	function	Pass if the page title is not the given string.
DrupalWebTestCase::assertNoUniqueText	protected	function	Pass if the text is found MORE THAN ONCE on the text version of the page.
DrupalWebTestCase::assertPattern	protected	function	Will trigger a pass if the Perl regex pattern is found in the raw content.
DrupalWebTestCase::assertRaw	protected	function	Pass if the raw text IS found on the loaded page, fail otherwise. Raw text refers to the raw HTML that the page generated.
DrupalWebTestCase::assertResponse	protected	function	Assert the page responds with the specified response code.
DrupalWebTestCase::assertText	protected	function	Pass if the text IS found on the text version of the page. The text version is the equivalent of what a user would see when viewing through a web browser. In other words the HTML has been filtered out of the contents.
DrupalWebTestCase::assertTextHelper	protected	function	Helper for assertText and assertNoText.
DrupalWebTestCase::assertTitle	protected	function	Pass if the page title is the given string.
DrupalWebTestCase::assertUniqueText	protected	function	Pass if the text is found ONLY ONCE on the text version of the page.
DrupalWebTestCase::assertUniqueTextHelper	protected	function	Helper for assertUniqueText and assertNoUniqueText.
DrupalWebTestCase::checkForMetaRefresh	protected	function	Check for meta refresh tag and if found call drupalGet() recursively. This function looks for the http-equiv attribute to be set to "Refresh" and is case-sensitive.
DrupalWebTestCase::checkPermissions	protected	function	Check to make sure that the array of permissions are valid.
DrupalWebTestCase::clickLink	protected	function	Follows a link by name.
DrupalWebTestCase::constructFieldXpath	protected	function	Helper function: construct an XPath for the given set of attributes and value.
DrupalWebTestCase::cronRun	protected	function	Runs cron in the Drupal installed by Simpletest.
DrupalWebTestCase::curlClose	protected	function	Close the cURL handler and unset the handler.
DrupalWebTestCase::curlExec	protected	function	Performs a cURL exec with the specified options after calling curlConnect().
DrupalWebTestCase::curlHeaderCallback	protected	function	Reads headers and registers errors received from the tested site.
DrupalWebTestCase::curlInitialize	protected	function	Initializes the cURL connection.
DrupalWebTestCase::drupalCompareFiles	protected	function	Compare two files based on size and file name.
DrupalWebTestCase::drupalCreateContentType	protected	function	Creates a custom content type based on default settings.
DrupalWebTestCase::drupalCreateNode	protected	function	Creates a node based on default settings.
DrupalWebTestCase::drupalCreateRole	protected	function	Internal helper function; Create a role with specified permissions.
DrupalWebTestCase::drupalCreateUser	protected	function	Create a user with a given set of permissions. The permissions correspond to the names given on the privileges page.
DrupalWebTestCase::drupalGet	protected	function	Retrieves a Drupal path or an absolute path.
DrupalWebTestCase::drupalGetContent	protected	function	Gets the current raw HTML of requested page.
DrupalWebTestCase::drupalGetHeader	protected	function	Gets the value of an HTTP response header. If multiple requests were required to retrieve the page, only the headers from the last request will be checked by default. However, if TRUE is passed as the second argument, all requests will be processed…
DrupalWebTestCase::drupalGetHeaders	protected	function	Gets the HTTP response headers of the requested page. Normally we are only interested in the headers returned by the last request. However, if a page is redirected or HTTP authentication is in use, multiple requests will be required to retrieve the…
DrupalWebTestCase::drupalGetMails	protected	function	Gets an array containing all e-mails sent during this test case.
DrupalWebTestCase::drupalGetNodeByTitle		function	Get a node from the database based on its title.
DrupalWebTestCase::drupalGetTestFiles	protected	function	Get a list files that can be used in tests.
DrupalWebTestCase::drupalGetToken	protected	function	Generate a token for the currently logged in user.
DrupalWebTestCase::drupalHead	protected	function	Retrieves only the headers for a Drupal path or an absolute path.
DrupalWebTestCase::drupalLogin	protected	function	Log in a user with the internal browser.
DrupalWebTestCase::drupalLogout	protected	function
DrupalWebTestCase::drupalPost	protected	function	Execute a POST request on a Drupal page. It will be done as usual POST request with SimpleBrowser.
DrupalWebTestCase::drupalSetContent	protected	function	Sets the raw HTML content. This can be useful when a page has been fetched outside of the internal browser and assertions need to be made on the returned page.
DrupalWebTestCase::getAbsoluteUrl	protected	function	Takes a path and returns an absolute path.
DrupalWebTestCase::getAllOptions	protected	function	Get all option elements, including nested options, in a select.
DrupalWebTestCase::getSelectedItem	protected	function	Get the selected value from a select field.
DrupalWebTestCase::getUrl	protected	function	Get the current url from the cURL handler.
DrupalWebTestCase::handleForm	protected	function	Handle form input related to drupalPost(). Ensure that the specified fields exist and attempt to create POST data in the correct manner for the particular field type.
DrupalWebTestCase::parse	protected	function	Parse content returned from curlExec using DOM and SimpleXML.
DrupalWebTestCase::preloadRegistry	protected	function	This method is called by DrupalWebTestCase::setUp, and preloads the registry from the testing site to cut down on the time it takes to setup a clean environment for the current test run.
DrupalWebTestCase::refreshVariables	protected	function	Refresh the in-memory set of variables. Useful after a page request is made that changes a variable in a different thread.
DrupalWebTestCase::setUp	protected	function	Generates a random database prefix, runs the install scripts on the prefixed database and enable the specified modules. After installation many caches are flushed and the internal browser is setup so that the page requests will run on the new prefix.…	55
DrupalWebTestCase::tearDown	protected	function	Delete created files and temporary files directory, delete the tables created by setUp(), and reset the database prefix.	3
DrupalWebTestCase::verbose	protected	function	Log verbose message in a text file.
DrupalWebTestCase::xpath	protected	function	Perform an xpath search on the contents of the internal browser. The search is relative to the root element (HTML tag normally) of the page.
DrupalWebTestCase::__construct		function	Constructor for DrupalWebTestCase. Overrides DrupalTestCase::__construct