Index: client/review/browser.inc
===================================================================
RCS file: client/review/browser.inc
diff -N client/review/browser.inc
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ client/review/browser.inc	1 Jan 1970 00:00:00 -0000
@@ -0,0 +1,2268 @@
+<?php
+// $Id: drupal_web_test_case.inc,v 1.1.2.1 2009/02/08 02:35:39 boombatower Exp $
+/**
+ * @file
+ * Provide backported DrupalWebTestCase from Drupal 7 core.
+ *
+ * Copyright 2008-2009 by Jimmy Berry ("boombatower", http://drupal.org/user/214218)
+ */
+
+/**
+ * Test case for typical Drupal tests.
+ */
+class PIFRBrowser {
+
+  /**
+   * The test run ID.
+   *
+   * @var string
+   */
+  protected $testId;
+
+  /**
+   * 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;
+
+  /**
+   * Whether a user is logged in the internal browser.
+   *
+   * @var bool
+   */
+  protected $isLoggedIn = 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 database prefix, before it was changed for testing purposes.
+   *
+   * @var string
+   */
+  protected $originalPrefix = NULL;
+
+  /**
+   * The original file directory, before it was changed for testing purposes.
+   *
+   * @var string
+   */
+  protected $originalFileDirectory = NULL;
+
+  /**
+   * The original user, before it was changed to a clean uid = 1 for testing purposes.
+   *
+   * @var object
+   */
+  protected $originalUser = NULL;
+
+  /**
+   * Current results of this test case.
+   *
+   * @var Array
+   */
+  public $results = array(
+    '#pass' => 0,
+    '#fail' => 0,
+    '#exception' => 0,
+  );
+
+  /**
+   * Assertions thrown in that test case.
+   *
+   * @var Array
+   */
+  protected $assertions = array();
+
+  /**
+   * Time limit for the test.
+   */
+  protected $timeLimit = 180;
+
+
+  /**
+   * Constructor for DrupalWebTestCase.
+   *
+   * @param $test_id
+   *   Tests with the same id are reported together.
+   */
+  public function __construct($test_id = NULL) {
+    $this->testId = $test_id;
+  }
+
+  /**
+   * Internal helper: stores the assert.
+   *
+   * @param $status
+   *   Can be 'pass', 'fail', 'exception'.
+   *   TRUE is a synonym for 'pass', FALSE for 'fail'.
+   * @param $message
+   *   The message string.
+   * @param $group
+   *   Which group this assert belongs to.
+   * @param $caller
+   *   By default, the assert comes from a function whose name starts with
+   *   'test'. Instead, you can specify where this assert originates from
+   *   by passing in an associative array as $caller. Key 'file' is
+   *   the name of the source file, 'line' is the line number and 'function'
+   *   is the caller function itself.
+   */
+  protected function assert($status, $message = '', $group = 'Other', array $caller = NULL) {
+    global $db_prefix;
+
+    // Convert boolean status to string status.
+    if (is_bool($status)) {
+      $status = $status ? 'pass' : 'fail';
+    }
+
+    // Increment summary result counter.
+    $this->results['#' . $status]++;
+
+    // Get the function information about the call to the assertion method.
+    if (!$caller) {
+      $caller = $this->getAssertionCall();
+    }
+
+    // Switch to non-testing database to store results in.
+    $current_db_prefix = $db_prefix;
+    $db_prefix = $this->originalPrefix;
+
+    // Creation assertion array that can be displayed while tests are running.
+    $this->assertions[] = $assertion = array(
+      'test_id' => $this->testId,
+      'test_class' => get_class($this),
+      'status' => $status,
+      'message' => $message,
+      'message_group' => $group,
+      'function' => $caller['function'],
+      'line' => $caller['line'],
+      'file' => $caller['file'],
+    );
+
+    // Store assertion for display after the test has completed.
+//    db_insert('simpletest')->fields($assertion)->execute();
+
+    // Return to testing prefix.
+    $db_prefix = $current_db_prefix;
+    return $status == 'pass' ? TRUE : FALSE;
+  }
+
+  /**
+   * Cycles through backtrace until the first non-assertion method is found.
+   *
+   * @return
+   *   Array representing the true caller.
+   */
+  protected function getAssertionCall() {
+    $backtrace = debug_backtrace();
+
+    // The first element is the call. The second element is the caller.
+    // We skip calls that occurred in one of the methods of DrupalWebTestCase
+    // or in an assertion function.
+    while (($caller = $backtrace[1]) &&
+          ((isset($caller['class']) && $caller['class'] == 'DrupalWebTestCase') ||
+            substr($caller['function'], 0, 6) == 'assert')) {
+      // We remove that call.
+      array_shift($backtrace);
+    }
+
+    return _drupal_get_last_caller($backtrace);
+  }
+
+  /**
+   * Check to see if a value is not false (not an empty string, 0, NULL, or FALSE).
+   *
+   * @param $value
+   *   The value on which the assertion is to be done.
+   * @param $message
+   *   The message to display along with the assertion.
+   * @param $group
+   *   The type of assertion - examples are "Browser", "PHP".
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertTrue($value, $message = '', $group = 'Other') {
+    return $this->assert((bool) $value, $message ? $message : t('Value is TRUE'), $group);
+  }
+
+  /**
+   * Check to see if a value is false (an empty string, 0, NULL, or FALSE).
+   *
+   * @param $value
+   *   The value on which the assertion is to be done.
+   * @param $message
+   *   The message to display along with the assertion.
+   * @param $group
+   *   The type of assertion - examples are "Browser", "PHP".
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertFalse($value, $message = '', $group = 'Other') {
+    return $this->assert(!$value, $message ? $message : t('Value is FALSE'), $group);
+  }
+
+  /**
+   * Check to see if a value is NULL.
+   *
+   * @param $value
+   *   The value on which the assertion is to be done.
+   * @param $message
+   *   The message to display along with the assertion.
+   * @param $group
+   *   The type of assertion - examples are "Browser", "PHP".
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertNull($value, $message = '', $group = 'Other') {
+    return $this->assert(!isset($value), $message ? $message : t('Value is NULL'), $group);
+  }
+
+  /**
+   * Check to see if a value is not NULL.
+   *
+   * @param $value
+   *   The value on which the assertion is to be done.
+   * @param $message
+   *   The message to display along with the assertion.
+   * @param $group
+   *   The type of assertion - examples are "Browser", "PHP".
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertNotNull($value, $message = '', $group = 'Other') {
+    return $this->assert(isset($value), $message ? $message : t('Value is not NULL'), $group);
+  }
+
+  /**
+   * Check to see if two values are equal.
+   *
+   * @param $first
+   *   The first value to check.
+   * @param $second
+   *   The second value to check.
+   * @param $message
+   *   The message to display along with the assertion.
+   * @param $group
+   *   The type of assertion - examples are "Browser", "PHP".
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertEqual($first, $second, $message = '', $group = 'Other') {
+    return $this->assert($first == $second, $message ? $message : t('First value is equal to second value'), $group);
+  }
+
+  /**
+   * Check to see if two values are not equal.
+   *
+   * @param $first
+   *   The first value to check.
+   * @param $second
+   *   The second value to check.
+   * @param $message
+   *   The message to display along with the assertion.
+   * @param $group
+   *   The type of assertion - examples are "Browser", "PHP".
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertNotEqual($first, $second, $message = '', $group = 'Other') {
+    return $this->assert($first != $second, $message ? $message : t('First value is not equal to second value'), $group);
+  }
+
+  /**
+   * Check to see if two values are identical.
+   *
+   * @param $first
+   *   The first value to check.
+   * @param $second
+   *   The second value to check.
+   * @param $message
+   *   The message to display along with the assertion.
+   * @param $group
+   *   The type of assertion - examples are "Browser", "PHP".
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertIdentical($first, $second, $message = '', $group = 'Other') {
+    return $this->assert($first === $second, $message ? $message : t('First value is identical to second value'), $group);
+  }
+
+  /**
+   * Check to see if two values are not identical.
+   *
+   * @param $first
+   *   The first value to check.
+   * @param $second
+   *   The second value to check.
+   * @param $message
+   *   The message to display along with the assertion.
+   * @param $group
+   *   The type of assertion - examples are "Browser", "PHP".
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertNotIdentical($first, $second, $message = '', $group = 'Other') {
+    return $this->assert($first !== $second, $message ? $message : t('First value is not identical to second value'), $group);
+  }
+
+  /**
+   * Fire an assertion that is always positive.
+   *
+   * @param $message
+   *   The message to display along with the assertion.
+   * @param $group
+   *   The type of assertion - examples are "Browser", "PHP".
+   * @return
+   *   TRUE.
+   */
+  protected function pass($message = NULL, $group = 'Other') {
+    return $this->assert(TRUE, $message, $group);
+  }
+
+  /**
+   * Fire an assertion that is always negative.
+   *
+   * @param $message
+   *   The message to display along with the assertion.
+   * @param $group
+   *   The type of assertion - examples are "Browser", "PHP".
+   * @return
+   *   FALSE.
+   */
+  protected function fail($message = NULL, $group = 'Other') {
+    return $this->assert(FALSE, $message, $group);
+  }
+
+  /**
+   * Fire an error assertion.
+   *
+   * @param $message
+   *   The message to display along with the assertion.
+   * @param $group
+   *   The type of assertion - examples are "Browser", "PHP".
+   * @param $caller
+   *   The caller of the error.
+   * @return
+   *   FALSE.
+   */
+  protected function error($message = '', $group = 'Other', array $caller = NULL) {
+    return $this->assert('exception', $message, $group, $caller);
+  }
+
+  /**
+   * Run all tests in this class.
+   */
+  public function run() {
+    set_error_handler(array($this, 'errorHandler'));
+    $methods = array();
+    // Iterate through all the methods in this class.
+    foreach (get_class_methods(get_class($this)) as $method) {
+      // If the current method starts with "test", run it - it's a test.
+      if (strtolower(substr($method, 0, 4)) == 'test') {
+        $this->setUp();
+        try {
+          $this->$method();
+          // Finish up.
+        }
+        catch (Exception $e) {
+          $this->exceptionHandler($e);
+        }
+        $this->tearDown();
+      }
+    }
+    // Clear out the error messages and restore error handler.
+    drupal_get_messages();
+    restore_error_handler();
+  }
+
+  /**
+   * Handle errors.
+   *
+   * Because this is registered in set_error_handler(), it has to be public.
+   * @see set_error_handler
+   *
+   */
+  public function errorHandler($severity, $message, $file = NULL, $line = NULL) {
+    if ($severity & error_reporting()) {
+      $error_map = array(
+        E_STRICT => 'Run-time notice',
+        E_WARNING => 'Warning',
+        E_NOTICE => 'Notice',
+        E_CORE_ERROR => 'Core error',
+        E_CORE_WARNING => 'Core warning',
+        E_USER_ERROR => 'User error',
+        E_USER_WARNING => 'User warning',
+        E_USER_NOTICE => 'User notice',
+        E_RECOVERABLE_ERROR => 'Recoverable error',
+      );
+
+      $backtrace = debug_backtrace();
+      $this->error($message, $error_map[$severity], _drupal_get_last_caller($backtrace));
+    }
+    return TRUE;
+  }
+
+  /**
+   * Handle exceptions.
+   *
+   * @see set_exception_handler
+   */
+  protected function exceptionHandler($exception) {
+    $backtrace = $exception->getTrace();
+    // Push on top of the backtrace the call that generated the exception.
+    array_unshift($backtrace, array(
+      'line' => $exception->getLine(),
+      'file' => $exception->getFile(),
+    ));
+    $this->error($exception->getMessage(), 'Uncaught exception', _drupal_get_last_caller($backtrace));
+  }
+
+  /**
+   * 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 $settings
+   *   An associative array of settings to change from the defaults, keys are
+   *   node properties, for example 'body' => 'Hello, world!'.
+   * @return
+   *   Created node object.
+   */
+  protected function drupalCreateNode($settings = array()) {
+    // Populate defaults array
+    $defaults = array(
+      'body'      => $this->randomName(32),
+      'title'     => $this->randomName(8),
+      'comment'   => 2,
+      'changed'   => REQUEST_TIME,
+      'format'    => FILTER_FORMAT_DEFAULT,
+      'moderate'  => 0,
+      'promote'   => 0,
+      'revision'  => 1,
+      'log'       => '',
+      'status'    => 1,
+      'sticky'    => 0,
+      'type'      => 'page',
+      'revisions' => NULL,
+      'taxonomy'  => NULL,
+    );
+    $defaults['teaser'] = $defaults['body'];
+    // If we already have a node, we use the original node's created time, and this
+    if (isset($defaults['created'])) {
+      $defaults['date'] = format_date($defaults['created'], 'custom', 'Y-m-d H:i:s O');
+    }
+    if (empty($settings['uid'])) {
+      global $user;
+      $defaults['uid'] = $user->uid;
+    }
+    $node = ($settings + $defaults);
+    $node = (object)$node;
+
+    node_save($node);
+
+    // small hack to link revisions to our test user
+    db_query('UPDATE {node_revision} SET uid = %d WHERE vid = %d', $node->uid, $node->vid);
+    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(3, 'type_'));
+    } while (node_get_types('type', $name));
+
+    // Populate defaults array
+    $defaults = array(
+      'type' => $name,
+      'name' => $name,
+      'description' => '',
+      'help' => '',
+      'min_word_count' => 0,
+      '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();
+
+    $this->assertEqual($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->filename);
+          if ($stats['size'] != $size) {
+            unset($files[$file->filename]);
+          }
+        }
+      }
+    }
+    usort($files, array($this, 'drupalCompareFiles'));
+    return $files;
+  }
+
+  /**
+   * Compare two files based on size and file name.
+   */
+  protected function drupalCompareFiles($file1, $file2) {
+    // Determine which file is larger.
+    $compare_size = (filesize($file1->filename) > filesize($file2->filename));
+    if (!$compare_size) {
+      // Both files were the same size, so return whichever one is alphabetically greater.
+      return strnatcmp($file1->name, $file2->name);
+    }
+    else {
+      // Return TRUE if $file1 is larger than $file2.
+      return $compare_size;
+    }
+  }
+
+  /**
+   * Generates a random string.
+   *
+   * @param $number
+   *   Number of characters in length to append to the prefix.
+   * @param $prefix
+   *   Prefix to use.
+   * @return
+   *   Randomly generated string.
+   */
+  public static function randomName($number = 4, $prefix = 'simpletest_') {
+    $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_';
+    for ($x = 0; $x < $number; $x++) {
+      $prefix .= $chars{mt_rand(0, strlen($chars) - 1)};
+      if ($x == 0) {
+        $chars .= '0123456789';
+      }
+    }
+    return $prefix;
+  }
+
+  /**
+   * 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 = NULL) {
+    // 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('', $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.
+   * @return
+   *   Role ID of newly created role, or FALSE if role creation failed.
+   */
+  protected function _drupalCreateRole(array $permissions = NULL) {
+    // Generate string version of permissions list.
+    if ($permissions === NULL) {
+      $permissions = array('access comments', 'access content', 'post comments', 'post comments without approval');
+    }
+
+    if (!$this->checkPermissions($permissions)) {
+      return FALSE;
+    }
+
+    // Create new role.
+    $role_name = $this->randomName();
+    db_query("INSERT INTO {role} (name) VALUES ('%s')", $role_name);
+    $role = db_fetch_object(db_query("SELECT * FROM {role} WHERE name = '%s'", $role_name));
+    $this->assertTrue($role, t('Created role of name: @role_name, id: @rid', array('@role_name' => $role_name, '@rid' => (isset($role->rid) ? $role->rid : t('-n/a-')))), t('Role'));
+    if ($role && !empty($role->rid)) {
+      // Assign permissions to role and mark it for clean-up.
+      foreach ($permissions as $permission_string) {
+        db_query("INSERT INTO {role_permission} (rid, permission) VALUES (%d, '%s')", $role->rid, $permission_string);
+      }
+      $count = db_result(db_query("SELECT COUNT(*) FROM {role_permission} WHERE rid = %d", $role->rid));
+      $this->assertTrue($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) {
+    static $available;
+
+    if (!isset($available) || $reset) {
+      $available = array_keys(module_invoke_all('perm'));
+    }
+
+    $valid = TRUE;
+    foreach ($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()
+   */
+  public function drupalLogin(stdClass $user) {
+    if ($this->isLoggedIn) {
+      $this->drupalLogout();
+    }
+
+    $edit = array(
+      'name' => $user->name,
+      'pass' => $user->pass_raw
+    );
+    $this->drupalPost('user', $edit, t('Log in'));
+
+    $pass = $this->assertText($user->name, t('Found name: %name', array('%name' => $user->name)), t('User login'));
+    $pass = $pass && $this->assertNoText(t('The username %name has been blocked.', array('%name' => $user->name)), t('No blocked message at login page'), t('User login'));
+    $pass = $pass && $this->assertNoText(t('The name %name is a reserved username.', array('%name' => $user->name)), t('No reserved message at login page'), t('User login'));
+
+    $this->isLoggedIn = $pass;
+  }
+
+  /*
+   * 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.
+    $this->drupalGet('user/logout');
+
+    // Load the user page, the idea being if you were properly logged out you should be seeing a login screen.
+    $this->drupalGet('user');
+    $pass = $this->assertField('name', t('Username field found.'), t('Logout'));
+    $pass = $pass && $this->assertField('pass', t('Password field found.'), t('Logout'));
+
+    $this->isLoggedIn = !$pass;
+  }
+
+  /**
+   * 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() {
+    global $db_prefix, $user;
+
+    // Store necessary current values before switching to prefixed database.
+    $this->originalPrefix = $db_prefix;
+    $clean_url_original = variable_get('clean_url', 0);
+
+    // Generate temporary prefixed database to ensure that tests have a clean starting point.
+    $db_prefix = Database::getConnection()->prefixTables('{simpletest' . mt_rand(1000, 1000000) . '}');
+
+    include_once DRUPAL_ROOT . '/includes/install.inc';
+    drupal_install_system();
+
+    $this->preloadRegistry();
+
+    // Add the specified modules to the list of modules in the default profile.
+    $args = func_get_args();
+    $modules = array_unique(array_merge(drupal_get_profile_modules('default', 'en'), $args));
+    drupal_install_modules($modules, 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.
+    $task = 'profile';
+    default_profile_tasks($task, '');
+
+    // Rebuild caches.
+    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(array('uid' => 1));
+
+    // Restore necessary variables.
+    variable_set('install_profile', 'default');
+    variable_set('install_task', 'profile-finished');
+    variable_set('clean_url', $clean_url_original);
+    variable_set('site_mail', 'simpletest@example.com');
+
+    // Use temporary files directory with the same prefix as database.
+    $this->originalFileDirectory = file_directory_path();
+    variable_set('file_directory_path', file_directory_path() . '/' . $db_prefix);
+    $directory = file_directory_path();
+    file_check_directory($directory, FILE_CREATE_DIRECTORY); // Create the files directory.
+    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_init();
+  }
+
+  /**
+   * 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;
+    if (preg_match('/simpletest\d+/', $db_prefix)) {
+      // Delete temporary files directory and reset files directory path.
+      simpletest_clean_temporary_directory(file_directory_path());
+      variable_set('file_directory_path', $this->originalFileDirectory);
+
+      // Remove all prefixed tables (all the tables in the schema).
+      $schema = drupal_get_schema(NULL, TRUE);
+      $ret = array();
+      foreach ($schema as $name => $table) {
+        db_drop_table($ret, $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->isLoggedIn = 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(MODULE_IMPLEMENTS_CLEAR_CACHE);
+
+      // Reset the Field API.
+      field_cache_clear();
+
+      // Rebuild caches.
+      $this->refreshVariables();
+
+      // Close the CURL handler.
+      $this->curlClose();
+    }
+  }
+
+  /**
+   * Initializes the cURL connection.
+   *
+   * This function will add authentication headers as specified in the
+   * simpletest_httpauth_username and simpletest_httpauth_pass variables. Also,
+   * see the description of $curl_options among the properties.
+   */
+  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 => $base_url,
+        CURLOPT_FOLLOWLOCATION => TRUE,
+        CURLOPT_RETURNTRANSFER => TRUE,
+        CURLOPT_SSL_VERIFYPEER => FALSE,  // Required to make the tests run on https://
+        CURLOPT_SSL_VERIFYHOST => FALSE,  // Required to make the tests run on https://
+        CURLOPT_HEADERFUNCTION => array(&$this, 'curlHeaderCallback'),
+      );
+      $curl_options[CURLOPT_USERAGENT] = 'pifr';
+      if (!isset($curl_options[CURLOPT_USERPWD]) && ($auth = variable_get('simpletest_httpauth_username', ''))) {
+        if ($pass = variable_get('simpletest_httpauth_pass', '')) {
+          $auth .= ':' . $pass;
+        }
+        $curl_options[CURLOPT_USERPWD] = $auth;
+      }
+      curl_setopt_array($this->curlHandle, $this->additionalCurlOptions + $curl_options);
+    }
+  }
+
+  /**
+   * 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) : $curl_options[CURLOPT_URL];
+    curl_setopt_array($this->curlHandle, $this->additionalCurlOptions + $curl_options);
+    $this->headers = array();
+    $this->drupalSetContent(curl_exec($this->curlHandle), curl_getinfo($this->curlHandle, CURLINFO_EFFECTIVE_URL));
+    $this->assertTrue($this->content !== FALSE, t('!method to !url, response is !length bytes.', array('!method' => !empty($curl_options[CURLOPT_NOBODY]) ? 'HEAD' : (empty($curl_options[CURLOPT_POSTFIELDS]) ? 'GET' : 'POST'), '!url' => $url, '!length' => strlen($this->content))), 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($matches[1])));
+    }
+    // This is required by cURL.
+    return strlen($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 $this->drupalGetContent()
+   */
+  public function drupalGet($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;
+    }
+    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 $headers
+   *   An array containing additional HTTP request headers, each formatted as
+   *   "name: value".
+   */
+  public function drupalPost($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 && $submit_matches) {
+          if ($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) {
+              $file = realpath($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;
+          }
+          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' => $path)));
+    }
+  }
+
+  /**
+   * Check for meta refresh tag and if found call drupalGet() recursively. This
+   * function looks for the http-equiv attribute to be set to "Refresh"
+   * and is case-sensitive.
+   *
+   * @return
+   *   Either the new page content or FALSE.
+   */
+  protected function checkForMetaRefresh() {
+    if ($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 '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 $group
+   *   The group this message belongs to, defaults to 'Other'.
+   */
+  protected function assertLink($label, $index = 0, $message = '', $group = 'Other') {
+    $links = $this->xpath('//a[text()="' . $label . '"]');
+    $message = ($message ?  $message : t('Link with label "!label" found.', array('!label' => $label)));
+    $this->assert(isset($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 $group
+   *   The group this message belongs to, defaults to 'Other'.
+   */
+  protected function assertNoLink($label, $message = '', $group = 'Other') {
+    $links = $this->xpath('//a[text()="' . $label . '"]');
+    $message = ($message ?  $message : t('Link with label "!label" not found.', array('!label' => $label)));
+    $this->assert(empty($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' => $url_before)), t('Browser'));
+
+    if (isset($urls[$index])) {
+      return $this->drupalGet($url_target);
+    }
+    return FALSE;
+  }
+
+  /**
+   * Takes a path and returns an absolute path.
+   *
+   * @param $path
+   *   The path, can be a Drupal path or a site-relative path. It might have a
+   *   query, too. Can even be an absolute path which is just passed through.
+   * @return
+   *   An absolute path.
+   */
+  protected function getAbsoluteUrl($path) {
+    $options = array('absolute' => TRUE);
+    $parts = parse_url($path);
+    // This is more crude than the menu_is_external but enough here.
+    if (empty($parts['host'])) {
+      $path = $parts['path'];
+      $base_path = base_path();
+      $n = strlen($base_path);
+      if (substr($path, 0, $n) == $base_path) {
+        $path = substr($path, $n);
+      }
+      if (isset($parts['query'])) {
+        $options['query'] = $parts['query'];
+      }
+      $path = url($path, $options);
+    }
+    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 $this->content;
+  }
+
+  /**
+   * Sets the raw HTML content. This can be useful when a page has been fetched
+   * outside of the internal browser and assertions need to be made on the
+   * returned page.
+   *
+   * A good example would be when testing drupal_http_request(). After fetching
+   * the page the content can be set and page elements can be checked to ensure
+   * that the function worked properly.
+   */
+  protected function drupalSetContent($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 = '%s found', $group = 'Other') {
+    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 = '%s found', $group = 'Other') {
+    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 $group
+   *   The group this message belongs to, defaults to 'Other'.
+   * @return
+   *   TRUE on pass, FALSE on fail.
+   */
+  public function assertText($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 = '"' . $text . '"' . ($not_exists ? ' not found' : ' found');
+    }
+    return $this->assert($not_exists == (strpos($this->plainTextContent, $text) === 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 = 'Pattern %s found', $group = 'Other') {
+    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 = 'Pattern %s not found', $group = 'Other') {
+    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 $this->assertTrue($this->xpath('//title[text()="' . $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 $this->assertFalse($this->xpath('//title[text()="' . $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 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'));
+  }
+  
+  /**
+   * TODO write documentation.
+   * @param $type
+   * @param $field_name
+   * @param $settings
+   * @return unknown_type
+   */
+  protected function drupalCreateField($type, $field_name = NULL, $settings = array()) {
+    if (!isset($field_name)) {
+      $field_name = strtolower($this->randomName());
+    }
+    $field_definition = array(
+      'field_name' => $field_name,
+      'type' => $type,
+    );
+    $field_definition += $settings;
+    field_create_field($field_definition);
+    
+    $field = field_read_field($field_name);
+    $this->assertTrue($field, t('Created field @field_name of type @type.', array('@field_name' => $field_name, '@type' => $type)));
+    
+    return $field;
+  }
+  
+  /**
+   * TODO write documentation.
+   * @param $field_name
+   * @param $widget_type
+   * @param $display_type
+   * @param $bundle
+   * @return unknown_type
+   */
+  protected function drupalCreateFieldInstance($field_name, $widget_type, $formatter_type, $bundle) {
+    $instance_definition = array(
+      'field_name' => $field_name,
+      'bundle' => $bundle,
+      'widget' => array(
+        'type' => $widget_type,
+      ),
+      'display' => array(
+        'full' => array(
+          'type' => $formatter_type,
+        ),
+      ),
+    );
+    field_create_instance($instance_definition);
+    
+    $instance = field_read_instance($field_name, $bundle);
+    $this->assertTrue($instance, t('Created instance of field @field_name on bundle @bundle.', array('@field_name' => $field_name, '@bundle' => $bundle)));
+    
+    return $instance;
+  }
+}
+
+/*
+ * From common.inc.
+ */
+
+// Set the Drupal custom error handler.
+set_error_handler('_drupal_error_handler');
+set_exception_handler('_drupal_exception_handler');
+
+/**
+ * Custom PHP error handler.
+ *
+ * @param $error_level
+ *   The level of the error raised.
+ * @param $message
+ *   The error message.
+ * @param $filename
+ *   The filename that the error was raised in.
+ * @param $line
+ *   The line number the error was raised at.
+ * @param $context
+ *   An array that points to the active symbol table at the point the error occurred.
+ */
+function _drupal_error_handler($error_level, $message, $filename, $line, $context) {
+  if ($error_level & error_reporting()) {
+    // All these constants are documented at http://php.net/manual/en/errorfunc.constants.php
+    $types = array(
+      E_ERROR => 'Error',
+      E_WARNING => 'Warning',
+      E_PARSE => 'Parse error',
+      E_NOTICE => 'Notice',
+      E_CORE_ERROR => 'Core error',
+      E_CORE_WARNING => 'Core warning',
+      E_COMPILE_ERROR => 'Compile error',
+      E_COMPILE_WARNING => 'Compile warning',
+      E_USER_ERROR => 'User error',
+      E_USER_WARNING => 'User warning',
+      E_USER_NOTICE => 'User notice',
+      E_STRICT => 'Strict warning',
+      E_RECOVERABLE_ERROR => 'Recoverable fatal error'
+    );
+    $backtrace = debug_backtrace();
+
+    $caller = _drupal_get_last_caller(debug_backtrace());
+
+    // We treat recoverable errors as fatal.
+    _drupal_log_error(array(
+      '%type' => isset($types[$error_level]) ? $types[$error_level] : 'Unknown error',
+      '%message' => $message,
+      '%function' => $caller['function'],
+      '%file' => $caller['file'],
+      '%line' => $caller['line'],
+    ), $error_level == E_RECOVERABLE_ERROR);
+  }
+}
+
+/**
+ * Custom PHP exception handler.
+ *
+ * Uncaught exceptions are those not enclosed in a try/catch block. They are
+ * always fatal: the execution of the script will stop as soon as the exception
+ * handler exits.
+ *
+ * @param $exception
+ *   The exception object that was thrown.
+ */
+function _drupal_exception_handler($exception) {
+  // Log the message to the watchdog and return an error page to the user.
+  _drupal_log_error(_drupal_decode_exception($exception), TRUE);
+}
+
+/**
+ * Decode an exception, especially to retrive the correct caller.
+ *
+ * @param $exception
+ *   The exception object that was thrown.
+ * @return An error in the format expected by _drupal_log_error().
+ */
+function _drupal_decode_exception($exception) {
+  $backtrace = $exception->getTrace();
+  // Add the line throwing the exception to the backtrace.
+  array_unshift($backtrace, array('line' => $exception->getLine(), 'file' => $exception->getFile()));
+
+  // For PDOException errors, we try to return the initial caller,
+  // skipping internal functions of the database layer.
+  if ($exception instanceof PDOException) {
+    // The first element in the stack is the call, the second element gives us the caller.
+    // We skip calls that occurred in one of the classes of the database layer
+    // or in one of its global functions.
+//    $db_functions = array('db_query', 'pager_query', 'db_query_range', 'db_query_temporary', 'update_sql');
+    $db_functions = array('db_query', '_db_query', 'pager_query', 'db_query_range', 'db_query_temporary', 'update_sql');
+    while (!empty($backtrace[1]) && ($caller = $backtrace[1]) &&
+         ((isset($caller['class']) && (strpos($caller['class'], 'Query') !== FALSE || strpos($caller['class'], 'Database') !== FALSE)) ||
+         in_array($caller['function'], $db_functions))) {
+      // We remove that call.
+      array_shift($backtrace);
+    }
+  }
+  $caller = _drupal_get_last_caller($backtrace);
+
+  return array(
+    '%type' => get_class($exception),
+    '%message' => $exception->getMessage(),
+    '%function' => $caller['function'],
+    '%file' => $caller['file'],
+    '%line' => $caller['line'],
+  );
+}
+
+/**
+ * Log a PHP error or exception, display an error page in fatal cases.
+ *
+ * @param $error
+ *   An array with the following keys: %type, %message, %function, %file, %line.
+ * @param $fatal
+ *   TRUE if the error is fatal.
+ */
+function _drupal_log_error($error, $fatal = FALSE) {
+  // Initialize a maintenance theme early if the boostrap was not complete.
+  // Do it early because drupal_set_message() triggers an init_theme().
+  if ($fatal && (drupal_get_bootstrap_phase() != DRUPAL_BOOTSTRAP_FULL)) {
+    unset($GLOBALS['theme']);
+    if (!defined('MAINTENANCE_MODE')) {
+      define('MAINTENANCE_MODE', 'error');
+    }
+    drupal_maintenance_theme();
+  }
+
+  // When running inside the testing framework, we relay the errors
+  // to the tested site by the way of HTTP headers.
+  if (preg_match("/^simpletest\d+/", $_SERVER['HTTP_USER_AGENT']) && !headers_sent() && (!defined('SIMPLETEST_COLLECT_ERRORS') || SIMPLETEST_COLLECT_ERRORS)) {
+    static $number = 0;
+    $assertion = array(
+      $error['%message'],
+      $error['%type'],
+      array(
+        'function' => $error['%function'],
+        'file' => $error['%file'],
+        'line' => $error['%line'],
+      ),
+    );
+    header('X-Drupal-Assertion-' . $number . ': ' . rawurlencode(serialize($assertion)));
+    $number++;
+  }
+
+  // Force display of error messages in update.php or if the proper error
+  // reporting level is set.
+  $error_level = variable_get('error_level', 2);
+  if ($error_level == 2 || ($error_level == 1 && $error['%type'] != 'Notice') || (defined('MAINTENANCE_MODE') && MAINTENANCE_MODE == 'update')) {
+    drupal_set_message(t('%type: %message in %function (line %line of %file).', $error), 'error');
+  }
+
+  try {
+    watchdog('php', '%type: %message in %function (line %line of %file).', $error, WATCHDOG_ERROR);
+  }
+  catch (Exception $e) {
+    $new_error = _drupal_decode_exception($e);
+    drupal_set_message(t('%type: %message in %function (line %line of %file).', $new_error), 'error');
+  }
+
+  if ($fatal) {
+    drupal_set_header($_SERVER['SERVER_PROTOCOL'] . ' Service unavailable');
+    drupal_set_title(t('Error'));
+    if (!defined('MAINTENANCE_MODE') && drupal_get_bootstrap_phase() == DRUPAL_BOOTSTRAP_FULL) {
+      // To conserve CPU and bandwidth, omit the blocks.
+      $page = drupal_get_page(t('The website encountered an unexpected error. Please try again later.'));
+      $page['#show_blocks'] = FALSE;
+      print drupal_render_page($page);
+    }
+    else {
+      print theme('maintenance_page', t('The website encountered an unexpected error. Please try again later.'), FALSE);
+    }
+    exit;
+  }
+}
+
+/**
+ * Gets the last caller from a backtrace.
+ *
+ * @param $backtrace
+ *   A standard PHP backtrace.
+ * @return
+ *   An associative array with keys 'file', 'line' and 'function'.
+ */
+function _drupal_get_last_caller($backtrace) {
+  // Errors that occur inside PHP internal functions
+  // do not generate information about file and line.
+  while ($backtrace && !isset($backtrace[0]['line'])) {
+    array_shift($backtrace);
+  }
+
+  // The first trace is the call itself.
+  // It gives us the line and the file of the last call.
+  $call = $backtrace[0];
+
+  // The second call give us the function where the call originated.
+  if (isset($backtrace[1])) {
+    if (isset($backtrace[1]['class'])) {
+      $call['function'] = $backtrace[1]['class'] . $backtrace[1]['type'] . $backtrace[1]['function'] . '()';
+    }
+    else {
+      $call['function'] = $backtrace[1]['function'] . '()';
+    }
+  }
+  else {
+    $call['function'] = 'main()';
+  }
+  return $call;
+}