comparison modules/simpletest/drupal_web_test_case.php @ 0:ff03f76ab3fe

initial version

+<?php
+
+/**
+ * Global variable that holds information about the tests being run.
+ *
+ * An array, with the following keys:
+ *  - 'test_run_id': the ID of the test being run, in the form 'simpletest_%"
+ *  - 'in_child_site': TRUE if the current request is a cURL request from
+ *     the parent site.
+ *
+ * @var array
+ */
+global $drupal_test_info;
+
+/**
+ * Base class for Drupal tests.
+ *
+ * Do not extend this class, use one of the subclasses in this file.
+ */
+abstract class DrupalTestCase {
+  /**
+   * The test run ID.
+   *
+   * @var string
+   */
+  protected $testId;
+
+  /**
+   * The database prefix of this test run.
+   *
+   * @var string
+   */
+  protected $databasePrefix = NULL;
+
+  /**
+   * The original file directory, before it was changed for testing purposes.
+   *
+   * @var string
+   */
+  protected $originalFileDirectory = NULL;
+
+  /**
+   * Time limit for the test.
+   */
+  protected $timeLimit = 500;
+
+  /**
+   * Current results of this test case.
+   *
+   * @var Array
+   */
+  public $results = array(
+    '#pass' => 0,
+    '#fail' => 0,
+    '#exception' => 0,
+    '#debug' => 0,
+  );
+
+  /**
+   * Assertions thrown in that test case.
+   *
+   * @var Array
+   */
+  protected $assertions = array();
+
+  /**
+   * This class is skipped when looking for the source of an assertion.
+   *
+   * When displaying which function an assert comes from, it's not too useful
+   * to see "drupalWebTestCase->drupalLogin()', we would like to see the test
+   * that called it. So we need to skip the classes defining these helper
+   * methods.
+   */
+  protected $skipClasses = array(__CLASS__ => TRUE);
+
+  /**
+   * Flag to indicate whether the test has been set up.
+   *
+   * The setUp() method isolates the test from the parent Drupal site by
+   * creating a random prefix for the database and setting up a clean file
+   * storage directory. The tearDown() method then cleans up this test
+   * environment. We must ensure that setUp() has been run. Otherwise,
+   * tearDown() will act on the parent Drupal site rather than the test
+   * environment, destroying live data.
+   */
+  protected $setup = FALSE;
+
+  protected $setupDatabasePrefix = FALSE;
+
+  protected $setupEnvironment = FALSE;
+
+  /**
+   * Constructor for DrupalTestCase.
+   *
+   * @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 $caller = NULL) {
+    // Convert boolean status to string status.
+    if (is_bool($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();
+    }
+
+    // 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.
+    try {
+      $connection = Database::getConnection('default', 'simpletest_original_default');
+    }
+    catch (DatabaseConnectionNotDefinedException $e) {
+      // If the test was not set up, the simpletest_original_default
+      // connection does not exist.
+      $connection = Database::getConnection('default', 'default');
+    }
+    $connection
+      ->insert('simpletest')
+      ->fields($assertion)
+      ->execute();
+
+    // We do not use a ternary operator here to allow a breakpoint on
+    // test failure.
+    if ($status == 'pass') {
+      return TRUE;
+    }
+    else {
+      return FALSE;
+    }
+  }
+
+  /**
+   * Store an assertion from outside the testing context.
+   *
+   * This is useful for inserting assertions that can only be recorded after
+   * the test case has been destroyed, such as PHP fatal errors. The caller
+   * information is not automatically gathered since the caller is most likely
+   * inserting the assertion on behalf of other code. In all other respects
+   * the method behaves just like DrupalTestCase::assert() in terms of storing
+   * the assertion.
+   *
+   * @return
+   *   Message ID of the stored assertion.
+   *
+   * @see DrupalTestCase::assert()
+   * @see DrupalTestCase::deleteAssert()
+   */
+  public static function insertAssert($test_id, $test_class, $status, $message = '', $group = 'Other', array $caller = array()) {
+    // Convert boolean status to string status.
+    if (is_bool($status)) {
+      $status = $status ? 'pass' : 'fail';
+    }
+
+    $caller += array(
+      'function' => t('Unknown'),
+      'line' => 0,
+      'file' => t('Unknown'),
+    );
+
+    $assertion = array(
+      'test_id' => $test_id,
+      'test_class' => $test_class,
+      'status' => $status,
+      'message' => $message,
+      'message_group' => $group,
+      'function' => $caller['function'],
+      'line' => $caller['line'],
+      'file' => $caller['file'],
+    );
+
+    return db_insert('simpletest')
+      ->fields($assertion)
+      ->execute();
+  }
+
+  /**
+   * Delete an assertion record by message ID.
+   *
+   * @param $message_id
+   *   Message ID of the assertion to delete.
+   * @return
+   *   TRUE if the assertion was deleted, FALSE otherwise.
+   *
+   * @see DrupalTestCase::insertAssert()
+   */
+  public static function deleteAssert($message_id) {
+    return (bool) db_delete('simpletest')
+      ->condition('message_id', $message_id)
+      ->execute();
+  }
+
+  /**
+   * Cycles through backtrace until the first non-assertion method is found.
+   *
+   * @return
+   *   Array representing the true caller.
+   */
+  protected function getAssertionCall() {
+    $backtrace = debug_backtrace();
+
+    // The first element is the call. The second element is the caller.
+    // We skip calls that occurred in one of the methods of our base classes
+    // or in an assertion function.
+   while (($caller = $backtrace[1]) &&
+         ((isset($caller['class']) && isset($this->skipClasses[$caller['class']])) ||
+           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 ? $message : t('Value @value is TRUE.', array('@value' => var_export($value, 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 ? $message : t('Value @value is FALSE.', array('@value' => var_export($value, TRUE))), $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 ? $message : t('Value @value is NULL.', array('@value' => var_export($value, TRUE))), $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 ? $message : t('Value @value is not NULL.', array('@value' => var_export($value, TRUE))), $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 ? $message : t('Value @first is equal to value @second.', array('@first' => var_export($first, TRUE), '@second' => var_export($second, TRUE))), $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 ? $message : t('Value @first is not equal to value @second.', array('@first' => var_export($first, TRUE), '@second' => var_export($second, TRUE))), $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 ? $message : t('Value @first is identical to value @second.', array('@first' => var_export($first, TRUE), '@second' => var_export($second, TRUE))), $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 ? $message : t('Value @first is not identical to value @second.', array('@first' => var_export($first, TRUE), '@second' => var_export($second, TRUE))), $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 $caller = NULL) {
+    if ($group == 'User notice') {
+      // Since 'User notice' is set by trigger_error() which is used for debug
+      // set the message to a status of 'debug'.
+      return $this->assert('debug', $message, 'Debug', $caller);
+    }
+
+    return $this->assert('exception', $message, $group, $caller);
+  }
+
+  /**
+   * Logs 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)) {
+      $class_safe = str_replace('\\', '_', get_class($this));
+      $url = file_create_url($this->originalFileDirectory . '/simpletest/verbose/' . $class_safe . '-' . $id . '.html');
+      $this->error(l(t('Verbose message'), $url, array('attributes' => array('target' => '_blank'))), 'User notice');
+    }
+  }
+
+  /**
+   * Run all tests in this class.
+   *
+   * Regardless of whether $methods are passed or not, only method names
+   * starting with "test" are executed.
+   *
+   * @param $methods
+   *   (optional) A list of method names in the test case class to run; e.g.,
+   *   array('testFoo', 'testBar'). By default, all methods of the class are
+   *   taken into account, but it can be useful to only run a few selected test
+   *   methods during debugging.
+   */
+  public function run(array $methods = array()) {
+    // Initialize verbose debugging.
+    $class = get_class($this);
+    simpletest_verbose(NULL, variable_get('file_public_path', conf_path() . '/files'), str_replace('\\', '_', $class));
+
+    // HTTP auth settings (<username>:<password>) for the simpletest browser
+    // when sending requests to the test site.
+    $this->httpauth_method = variable_get('simpletest_httpauth_method', CURLAUTH_BASIC);
+    $username = variable_get('simpletest_httpauth_username', NULL);
+    $password = variable_get('simpletest_httpauth_password', NULL);
+    if ($username && $password) {
+      $this->httpauth_credentials = $username . ':' . $password;
+    }
+
+    set_error_handler(array($this, 'errorHandler'));
+    // Iterate through all the methods in this class, unless a specific list of
+    // methods to run was passed.
+    $class_methods = get_class_methods($class);
+    if ($methods) {
+      $class_methods = array_intersect($class_methods, $methods);
+    }
+    foreach ($class_methods as $method) {
+      // If the current method starts with "test", run it - it's a test.
+      if (strtolower(substr($method, 0, 4)) == 'test') {
+        // Insert a fail record. This will be deleted on completion to ensure
+        // that testing completed.
+        $method_info = new ReflectionMethod($class, $method);
+        $caller = array(
+          'file' => $method_info->getFileName(),
+          'line' => $method_info->getStartLine(),
+          'function' => $class . '->' . $method . '()',
+        );
+        $completion_check_id = DrupalTestCase::insertAssert($this->testId, $class, FALSE, t('The test did not complete due to a fatal error.'), 'Completion check', $caller);
+        $this->setUp();
+        if ($this->setup) {
+          try {
+            $this->$method();
+            // Finish up.
+          }
+          catch (Exception $e) {
+            $this->exceptionHandler($e);
+          }
+          $this->tearDown();
+        }
+        else {
+          $this->fail(t("The test cannot be executed because it has not been set up properly."));
+        }
+        // Remove the completion check record.
+        DrupalTestCase::deleteAssert($completion_check_id);
+      }
+    }
+    // Clear out the error messages and restore error handler.
+    drupal_get_messages();
+    restore_error_handler();
+  }
+
+  /**
+   * Handle errors during test runs.
+   *
+   * 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(),
+    ));
+    require_once DRUPAL_ROOT . '/includes/errors.inc';
+    // The exception message is run through check_plain() by _drupal_decode_exception().
+    $this->error(t('%type: !message in %function (line %line of %file).', _drupal_decode_exception($exception)), 'Uncaught exception', _drupal_get_last_caller($backtrace));
+  }
+
+  /**
+   * Generates a random string of ASCII characters of codes 32 to 126.
+   *
+   * The generated string includes alpha-numeric characters and common
+   * miscellaneous characters. Use this method when testing general input
+   * where the content is not restricted.
+   *
+   * Do not use this method when special characters are not possible (e.g., in
+   * machine or file names that have already been validated); instead,
+   * use DrupalWebTestCase::randomName().
+   *
+   * @param $length
+   *   Length of random string to generate.
+   *
+   * @return
+   *   Randomly generated string.
+   *
+   * @see DrupalWebTestCase::randomName()
+   */
+  public static function randomString($length = 8) {
+    $str = '';
+    for ($i = 0; $i < $length; $i++) {
+      $str .= chr(mt_rand(32, 126));
+    }
+    return $str;
+  }
+
+  /**
+   * Generates a random string containing letters and numbers.
+   *
+   * The string will always start with a letter. The letters may be upper or
+   * lower case. This method is better for restricted inputs that do not
+   * accept certain characters. For example, when testing input fields that
+   * require machine readable values (i.e. without spaces and non-standard
+   * characters) this method is best.
+   *
+   * Do not use this method when testing unvalidated user input. Instead, use
+   * DrupalWebTestCase::randomString().
+   *
+   * @param $length
+   *   Length of random string to generate.
+   *
+   * @return
+   *   Randomly generated string.
+   *
+   * @see DrupalWebTestCase::randomString()
+   */
+  public static function randomName($length = 8) {
+    $values = array_merge(range(65, 90), range(97, 122), range(48, 57));
+    $max = count($values) - 1;
+    $str = chr(mt_rand(97, 122));
+    for ($i = 1; $i < $length; $i++) {
+      $str .= chr($values[mt_rand(0, $max)]);
+    }
+    return $str;
+  }
+
+  /**
+   * Converts a list of possible parameters into a stack of permutations.
+   *
+   * Takes a list of parameters containing possible values, and converts all of
+   * them into a list of items containing every possible permutation.
+   *
+   * Example:
+   * @code
+   * $parameters = array(
+   *   'one' => array(0, 1),
+   *   'two' => array(2, 3),
+   * );
+   * $permutations = DrupalTestCase::generatePermutations($parameters)
+   * // Result:
+   * $permutations == array(
+   *   array('one' => 0, 'two' => 2),
+   *   array('one' => 1, 'two' => 2),
+   *   array('one' => 0, 'two' => 3),
+   *   array('one' => 1, 'two' => 3),
+   * )
+   * @endcode
+   *
+   * @param $parameters
+   *   An associative array of parameters, keyed by parameter name, and whose
+   *   values are arrays of parameter values.
+   *
+   * @return
+   *   A list of permutations, which is an array of arrays. Each inner array
+   *   contains the full list of parameters that have been passed, but with a
+   *   single value only.
+   */
+  public static function generatePermutations($parameters) {
+    $all_permutations = array(array());
+    foreach ($parameters as $parameter => $values) {
+      $new_permutations = array();
+      // Iterate over all values of the parameter.
+      foreach ($values as $value) {
+        // Iterate over all existing permutations.
+        foreach ($all_permutations as $permutation) {
+          // Add the new parameter value to existing permutations.
+          $new_permutations[] = $permutation + array($parameter => $value);
+        }
+      }
+      // Replace the old permutations with the new permutations.
+      $all_permutations = $new_permutations;
+    }
+    return $all_permutations;
+  }
+}
+
+/**
+ * Test case for Drupal unit tests.
+ *
+ * These tests can not access the database nor files. Calling any Drupal
+ * function that needs the database will throw exceptions. These include
+ * watchdog(), module_implements(), module_invoke_all() etc.
+ */
+class DrupalUnitTestCase extends DrupalTestCase {
+
+  /**
+   * Constructor for DrupalUnitTestCase.
+   */
+  function __construct($test_id = NULL) {
+    parent::__construct($test_id);
+    $this->skipClasses[__CLASS__] = TRUE;
+  }
+
+  /**
+   * Sets up unit test environment.
+   *
+   * Unlike DrupalWebTestCase::setUp(), DrupalUnitTestCase::setUp() does not
+   * install modules because tests are performed without accessing the database.
+   * Any required files must be explicitly included by the child class setUp()
+   * method.
+   */
+  protected function setUp() {
+    global $conf;
+
+    // Store necessary current values before switching to the test environment.
+    $this->originalFileDirectory = variable_get('file_public_path', conf_path() . '/files');
+
+    // Reset all statics so that test is performed with a clean environment.
+    drupal_static_reset();
+
+    // Generate temporary prefixed database to ensure that tests have a clean starting point.
+    $this->databasePrefix = Database::getConnection()->prefixTables('{simpletest' . mt_rand(1000, 1000000) . '}');
+
+    // Create test directory.
+    $public_files_directory = $this->originalFileDirectory . '/simpletest/' . substr($this->databasePrefix, 10);
+    file_prepare_directory($public_files_directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);
+    $conf['file_public_path'] = $public_files_directory;
+
+    // Clone the current connection and replace the current prefix.
+    $connection_info = Database::getConnectionInfo('default');
+    Database::renameConnection('default', 'simpletest_original_default');
+    foreach ($connection_info as $target => $value) {
+      $connection_info[$target]['prefix'] = array(
+        'default' => $value['prefix']['default'] . $this->databasePrefix,
+      );
+    }
+    Database::addConnectionInfo('default', 'default', $connection_info['default']);
+
+    // Set user agent to be consistent with web test case.
+    $_SERVER['HTTP_USER_AGENT'] = $this->databasePrefix;
+
+    // If locale is enabled then t() will try to access the database and
+    // subsequently will fail as the database is not accessible.
+    $module_list = module_list();
+    if (isset($module_list['locale'])) {
+      $this->originalModuleList = $module_list;
+      unset($module_list['locale']);
+      module_list(TRUE, FALSE, FALSE, $module_list);
+    }
+    $this->setup = TRUE;
+  }
+
+  protected function tearDown() {
+    global $conf;
+
+    // Get back to the original connection.
+    Database::removeConnection('default');
+    Database::renameConnection('simpletest_original_default', 'default');
+
+    $conf['file_public_path'] = $this->originalFileDirectory;
+    // Restore modules if necessary.
+    if (isset($this->originalModuleList)) {
+      module_list(TRUE, FALSE, FALSE, $this->originalModuleList);
+    }
+  }
+}
+
+/**
+ * Test case for typical Drupal tests.
+ */
+class DrupalWebTestCase extends DrupalTestCase {
+  /**
+   * The profile to install as a basis for testing.
+   *
+   * @var string
+   */
+  protected $profile = 'standard';
+
+  /**
+   * 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 value of the Drupal.settings JavaScript variable for the page currently loaded in the internal browser.
+   *
+   * @var Array
+   */
+  protected $drupalSettings;
+
+  /**
+   * 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;
+
+  /**
+   * The original shutdown handlers array, before it was cleaned for testing purposes.
+   *
+   * @var array
+   */
+  protected $originalShutdownCallbacks = array();
+
+  /**
+   * HTTP authentication method
+   */
+  protected $httpauth_method = CURLAUTH_BASIC;
+
+  /**
+   * 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;
+
+  /**
+   * Whether the files were copied to the test files directory.
+   */
+  protected $generatedTestFiles = FALSE;
+
+  /**
+   * The number of redirects followed during the handling of a request.
+   */
+  protected $redirect_count;
+
+  /**
+   * Constructor for DrupalWebTestCase.
+   */
+  function __construct($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().
+   * @param $reset
+   *   (optional) Whether to reset the internal node_load() cache.
+   *
+   * @return
+   *   A node object matching $title.
+   */
+  function drupalGetNodeByTitle($title, $reset = FALSE) {
+    $nodes = node_load_multiple(array(), array('title' => $title), $reset);
+    // 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(LANGUAGE_NONE => array(array())),
+      'title'     => $this->randomName(8),
+      'comment'   => 2,
+      'changed'   => REQUEST_TIME,
+      'moderate'  => 0,
+      'promote'   => 0,
+      'revision'  => 1,
+      'log'       => '',
+      'status'    => 1,
+      'sticky'    => 0,
+      'type'      => 'page',
+      'revisions' => NULL,
+      'language'  => LANGUAGE_NONE,
+    );
+
+    // Use the original node's created time for existing nodes.
+    if (isset($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(),
+    );
+    $settings['body'][$settings['language']][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();
+    node_add_body_field($type);
+
+    $this->assertEqual($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, $size = NULL) {
+    if (empty($this->generatedTestFiles)) {
+      // Generate binary test files.
+      $lines = array(64, 1024);
+      $count = 0;
+      foreach ($lines as $line) {
+        simpletest_generate_file('binary-' . $count++, 64, $line, 'binary');
+      }
+
+      // Generate text test files.
+      $lines = array(16, 256, 1024, 2048, 20480);
+      $count = 0;
+      foreach ($lines as $line) {
+        simpletest_generate_file('text-' . $count++, 64, $line);
+      }
+
+      // Copy other test files from simpletest.
+      $original = drupal_get_path('module', 'simpletest') . '/files';
+      $files = file_scan_directory($original, '/(html|image|javascript|php|sql)-.*/');
+      foreach ($files as $file) {
+        file_unmanaged_copy($file->uri, variable_get('file_public_path', conf_path() . '/files'));
+      }
+
+      $this->generatedTestFiles = TRUE;
+    }
+
+    $files = array();
+    // Make sure type is valid.
+    if (in_array($type, array('binary', 'html', 'image', 'javascript', 'php', 'sql', 'text'))) {
+      $files = file_scan_directory('public://', '/' . $type . '\-.*/');
+
+      // If size is set then remove any files that are not of that size.
+      if ($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.
+   *
+   * @param array $permissions
+   *   Array of permission names to assign to user. Note that the user always
+   *   has the default permissions derived from the "authenticated users" role.
+   *
+   * @return object|false
+   *   A fully loaded user object with pass_raw property, or FALSE if account
+   *   creation fails.
+   */
+  protected function drupalCreateUser(array $permissions = array()) {
+    // Create a role with the given permission set, if any.
+    $rid = FALSE;
+    if ($permissions) {
+      $rid = $this->drupalCreateRole($permissions);
+      if (!$rid) {
+        return FALSE;
+      }
+    }
+
+    // Create a user assigned to that role.
+    $edit = array();
+    $edit['name']   = $this->randomName();
+    $edit['mail']   = $edit['name'] . '@example.com';
+    $edit['pass']   = user_password();
+    $edit['status'] = 1;
+    if ($rid) {
+      $edit['roles'] = array($rid => $rid);
+    }
+
+    $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 log in 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 $account
+   *   User object representing the user to log in.
+   *
+   * @see drupalCreateUser()
+   */
+  protected function drupalLogin(stdClass $account) {
+    if ($this->loggedInUser) {
+      $this->drupalLogout();
+    }
+
+    $edit = array(
+      'name' => $account->name,
+      'pass' => $account->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' => $account->name)), t('User login'));
+
+    if ($pass) {
+      $this->loggedInUser = $account;
+    }
+  }
+
+  /**
+   * Generate a token for the currently logged in user.
+   */
+  protected function drupalGetToken($value = '') {
+    $private_key = drupal_get_private_key();
+    return drupal_hmac_base64($value, $this->session_id . $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');
+    $this->drupalGet('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 database prefix for running tests.
+   *
+   * The generated database table prefix is used for the Drupal installation
+   * being performed for the test. It is also used as user agent HTTP header
+   * value by the cURL-based browser of DrupalWebTestCase, which is sent
+   * to the Drupal installation of the test. During early Drupal bootstrap, the
+   * user agent HTTP header is parsed, and if it matches, all database queries
+   * use the database table prefix that has been generated here.
+   *
+   * @see DrupalWebTestCase::curlInitialize()
+   * @see drupal_valid_test_ua()
+   * @see DrupalWebTestCase::setUp()
+   */
+  protected function prepareDatabasePrefix() {
+    $this->databasePrefix = 'simpletest' . mt_rand(1000, 1000000);
+
+    // As soon as the database prefix is set, the test might start to execute.
+    // All assertions as well as the SimpleTest batch operations are associated
+    // with the testId, so the database prefix has to be associated with it.
+    db_update('simpletest_test_id')
+      ->fields(array('last_prefix' => $this->databasePrefix))
+      ->condition('test_id', $this->testId)
+      ->execute();
+  }
+
+  /**
+   * Changes the database connection to the prefixed one.
+   *
+   * @see DrupalWebTestCase::setUp()
+   */
+  protected function changeDatabasePrefix() {
+    if (empty($this->databasePrefix)) {
+      $this->prepareDatabasePrefix();
+      // If $this->prepareDatabasePrefix() failed to work, return without
+      // setting $this->setupDatabasePrefix to TRUE, so setUp() methods will
+      // know to bail out.
+      if (empty($this->databasePrefix)) {
+        return;
+      }
+    }
+
+    // Clone the current connection and replace the current prefix.
+    $connection_info = Database::getConnectionInfo('default');
+    Database::renameConnection('default', 'simpletest_original_default');
+    foreach ($connection_info as $target => $value) {
+      $connection_info[$target]['prefix'] = array(
+        'default' => $value['prefix']['default'] . $this->databasePrefix,
+      );
+    }
+    Database::addConnectionInfo('default', 'default', $connection_info['default']);
+
+    // Indicate the database prefix was set up correctly.
+    $this->setupDatabasePrefix = TRUE;
+  }
+
+  /**
+   * Prepares the current environment for running the test.
+   *
+   * Backups various current environment variables and resets them, so they do
+   * not interfere with the Drupal site installation in which tests are executed
+   * and can be restored in tearDown().
+   *
+   * Also sets up new resources for the testing environment, such as the public
+   * filesystem and configuration directories.
+   *
+   * @see DrupalWebTestCase::setUp()
+   * @see DrupalWebTestCase::tearDown()
+   */
+  protected function prepareEnvironment() {
+    global $user, $language, $conf;
+
+    // Store necessary current values before switching to prefixed database.
+    $this->originalLanguage = $language;
+    $this->originalLanguageDefault = variable_get('language_default');
+    $this->originalFileDirectory = variable_get('file_public_path', conf_path() . '/files');
+    $this->originalProfile = drupal_get_profile();
+    $this->originalCleanUrl = variable_get('clean_url', 0);
+    $this->originalUser = $user;
+
+    // Set to English to prevent exceptions from utf8_truncate() from t()
+    // during install if the current language is not 'en'.
+    // The following array/object conversion is copied from language_default().
+    $language = (object) array('language' => 'en', 'name' => 'English', 'native' => 'English', 'direction' => 0, 'enabled' => 1, 'plurals' => 0, 'formula' => '', 'domain' => '', 'prefix' => '', 'weight' => 0, 'javascript' => '');
+
+    // Save and clean the shutdown callbacks array because it is static cached
+    // and will be changed by the test run. Otherwise it will contain callbacks
+    // from both environments and the testing environment will try to call the
+    // handlers defined by the original one.
+    $callbacks = &drupal_register_shutdown_function();
+    $this->originalShutdownCallbacks = $callbacks;
+    $callbacks = array();
+
+    // Create test directory ahead of installation so fatal errors and debug
+    // information can be logged during installation process.
+    // Use temporary files directory with the same prefix as the database.
+    $this->public_files_directory = $this->originalFileDirectory . '/simpletest/' . substr($this->databasePrefix, 10);
+    $this->private_files_directory = $this->public_files_directory . '/private';
+    $this->temp_files_directory = $this->private_files_directory . '/temp';
+
+    // Create the directories
+    file_prepare_directory($this->public_files_directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);
+    file_prepare_directory($this->private_files_directory, FILE_CREATE_DIRECTORY);
+    file_prepare_directory($this->temp_files_directory, FILE_CREATE_DIRECTORY);
+    $this->generatedTestFiles = FALSE;
+
+    // Log fatal errors.
+    ini_set('log_errors', 1);
+    ini_set('error_log', $this->public_files_directory . '/error.log');
+
+    // Set the test information for use in other parts of Drupal.
+    $test_info = &$GLOBALS['drupal_test_info'];
+    $test_info['test_run_id'] = $this->databasePrefix;
+    $test_info['in_child_site'] = FALSE;
+
+    // Indicate the environment was set up correctly.
+    $this->setupEnvironment = TRUE;
+  }
+
+  /**
+   * Sets up a Drupal site for running functional and integration tests.
+   *
+   * Generates a random database prefix and installs Drupal with the specified
+   * installation profile in DrupalWebTestCase::$profile into the
+   * prefixed database. Afterwards, installs any additional modules specified by
+   * the test.
+   *
+   * After installation all caches are flushed and several configuration values
+   * are reset to the values of the parent site executing the test, since the
+   * default values may be incompatible with the environment in which tests are
+   * being executed.
+   *
+   * @param ...
+   *   List of modules to enable for the duration of the test. This can be
+   *   either a single array or a variable number of string arguments.
+   *
+   * @see DrupalWebTestCase::prepareDatabasePrefix()
+   * @see DrupalWebTestCase::changeDatabasePrefix()
+   * @see DrupalWebTestCase::prepareEnvironment()
+   */
+  protected function setUp() {
+    global $user, $language, $conf;
+
+    // Create the database prefix for this test.
+    $this->prepareDatabasePrefix();
+
+    // Prepare the environment for running tests.
+    $this->prepareEnvironment();
+    if (!$this->setupEnvironment) {
+      return FALSE;
+    }
+
+    // Reset all statics and variables to perform tests in a clean environment.
+    $conf = array();
+    drupal_static_reset();
+
+    // Change the database prefix.
+    // All static variables need to be reset before the database prefix is
+    // changed, since DrupalCacheArray implementations attempt to
+    // write back to persistent caches when they are destructed.
+    $this->changeDatabasePrefix();
+    if (!$this->setupDatabasePrefix) {
+      return FALSE;
+    }
+
+    // Preset the 'install_profile' system variable, so the first call into
+    // system_rebuild_module_data() (in drupal_install_system()) will register
+    // the test's profile as a module. Without this, the installation profile of
+    // the parent site (executing the test) is registered, and the test
+    // profile's hook_install() and other hook implementations are never invoked.
+    $conf['install_profile'] = $this->profile;
+
+    // Perform the actual Drupal installation.
+    include_once DRUPAL_ROOT . '/includes/install.inc';
+    drupal_install_system();
+
+    $this->preloadRegistry();
+
+    // Set path variables.
+    variable_set('file_public_path', $this->public_files_directory);
+    variable_set('file_private_path', $this->private_files_directory);
+    variable_set('file_temporary_path', $this->temp_files_directory);
+
+    // Set the 'simpletest_parent_profile' variable to add the parent profile's
+    // search path to the child site's search paths.
+    // @see drupal_system_listing()
+    // @todo This may need to be primed like 'install_profile' above.
+    variable_set('simpletest_parent_profile', $this->originalProfile);
+
+    // Include the testing profile.
+    variable_set('install_profile', $this->profile);
+    $profile_details = install_profile_info($this->profile, 'en');
+
+    // Install the modules specified by the testing profile.
+    module_enable($profile_details['dependencies'], FALSE);
+
+    // Install modules needed for this test. This could have been passed in as
+    // either a single array argument or a variable number of string arguments.
+    // @todo Remove this compatibility layer in Drupal 8, and only accept
+    // $modules as a single array argument.
+    $modules = func_get_args();
+    if (isset($modules[0]) && is_array($modules[0])) {
+      $modules = $modules[0];
+    }
+    if ($modules) {
+      $success = module_enable($modules, TRUE);
+      $this->assertTrue($success, t('Enabled modules: %modules', array('%modules' => implode(', ', $modules))));
+    }
+
+    // Run the profile tasks.
+    $install_profile_module_exists = db_query("SELECT 1 FROM {system} WHERE type = 'module' AND name = :name", array(
+      ':name' => $this->profile,
+    ))->fetchField();
+    if ($install_profile_module_exists) {
+      module_enable(array($this->profile), FALSE);
+    }
+
+    // Reset/rebuild all data structures after enabling the modules.
+    $this->resetAll();
+
+    // Run cron once in that environment, as install.php does at the end of
+    // the installation process.
+    drupal_cron_run();
+
+    // Ensure that the session is not written to the new environment and replace
+    // the global $user session with uid 1 from the new test site.
+    drupal_save_session(FALSE);
+    // Login as uid 1.
+    $user = user_load(1);
+
+    // Restore necessary variables.
+    variable_set('install_task', 'done');
+    variable_set('clean_url', $this->originalCleanUrl);
+    variable_set('site_mail', '[e-mail]');
+    variable_set('date_default_timezone', date_default_timezone_get());
+
+    // Set up English language.
+    unset($conf['language_default']);
+    $language = language_default();
+
+    // Use the test mail class instead of the default mail handler class.
+    variable_set('mail_system', array('default-system' => 'TestingMailSystem'));
+
+    drupal_set_time_limit($this->timeLimit);
+    $this->setup = TRUE;
+  }
+
+  /**
+   * Preload the registry from the testing site.
+   *
+   * This method is called by DrupalWebTestCase::setUp(), and preloads the
+   * registry from the testing site to cut down on the time it takes to
+   * set up a clean environment for the current test run.
+   */
+  protected function preloadRegistry() {
+    // Use two separate queries, each with their own connections: copy the
+    // {registry} and {registry_file} tables over from the parent installation
+    // to the child installation.
+    $original_connection = Database::getConnection('default', 'simpletest_original_default');
+    $test_connection = Database::getConnection();
+
+    foreach (array('registry', 'registry_file') as $table) {
+      // Find the records from the parent database.
+      $source_query = $original_connection
+        ->select($table, array(), array('fetch' => PDO::FETCH_ASSOC))
+        ->fields($table);
+
+      $dest_query = $test_connection->insert($table);
+
+      $first = TRUE;
+      foreach ($source_query->execute() as $row) {
+        if ($first) {
+          $dest_query->fields(array_keys($row));
+          $first = FALSE;
+        }
+        // Insert the records into the child database.
+        $dest_query->values($row);
+      }
+
+      $dest_query->execute();
+    }
+  }
+
+  /**
+   * Reset all data structures after having enabled new modules.
+   *
+   * This method is called by DrupalWebTestCase::setUp() after enabling
+   * the requested modules. It must be called again when additional modules
+   * are enabled later.
+   */
+  protected function resetAll() {
+    // Reset all static variables.
+    drupal_static_reset();
+    // Reset the list of enabled modules.
+    module_list(TRUE);
+
+    // Reset cached schema for new database prefix. This must be done before
+    // drupal_flush_all_caches() so rebuilds can make use of the schema of
+    // modules enabled on the cURL side.
+    drupal_get_schema(NULL, TRUE);
+
+    // Perform rebuilds and flush remaining caches.
+    drupal_flush_all_caches();
+
+    // Reload global $conf array and permissions.
+    $this->refreshVariables();
+    $this->checkPermissions(array(), TRUE);
+  }
+
+  /**
+   * 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_bootstrap');
+    $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 $user, $language;
+
+    // In case a fatal error occurred that was not in the test process read the
+    // log to pick up any fatal errors.
+    simpletest_log_read($this->testId, $this->databasePrefix, get_class($this), TRUE);
+
+    $emailCount = count(variable_get('drupal_test_email_collector', array()));
+    if ($emailCount) {
+      $message = format_plural($emailCount, '1 e-mail was sent during this test.', '@count e-mails were sent during this test.');
+      $this->pass($message, t('E-mail'));
+    }
+
+    // Delete temporary files directory.
+    file_unmanaged_delete_recursive($this->originalFileDirectory . '/simpletest/' . substr($this->databasePrefix, 10));
+
+    // Remove all prefixed tables.
+    $tables = db_find_tables($this->databasePrefix . '%');
+    $connection_info = Database::getConnectionInfo('default');
+    $tables = db_find_tables($connection_info['default']['prefix']['default'] . '%');
+    if (empty($tables)) {
+      $this->fail('Failed to find test tables to drop.');
+    }
+    $prefix_length = strlen($connection_info['default']['prefix']['default']);
+    foreach ($tables as $table) {
+      if (db_drop_table(substr($table, $prefix_length))) {
+        unset($tables[$table]);
+      }
+    }
+    if (!empty($tables)) {
+      $this->fail('Failed to drop all prefixed tables.');
+    }
+
+    // Get back to the original connection.
+    Database::removeConnection('default');
+    Database::renameConnection('simpletest_original_default', 'default');
+
+    // Restore original shutdown callbacks array to prevent original
+    // environment of calling handlers from test run.
+    $callbacks = &drupal_register_shutdown_function();
+    $callbacks = $this->originalShutdownCallbacks;
+
+    // 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 public files directory.
+    $GLOBALS['conf']['file_public_path'] = $this->originalFileDirectory;
+
+    // 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 $base_url;
+
+    if (!isset($this->curlHandle)) {
+      $this->curlHandle = curl_init();
+
+      // Some versions/configurations of cURL break on a NULL cookie jar, so
+      // supply a real file.
+      if (empty($this->cookieFile)) {
+        $this->cookieFile = $this->public_files_directory . '/cookie.jar';
+      }
+
+      $curl_options = array(
+        CURLOPT_COOKIEJAR => $this->cookieFile,
+        CURLOPT_URL => $base_url,
+        CURLOPT_FOLLOWLOCATION => FALSE,
+        CURLOPT_RETURNTRANSFER => TRUE,
+        CURLOPT_SSL_VERIFYPEER => FALSE, // Required to make the tests run on HTTPS.
+        CURLOPT_SSL_VERIFYHOST => FALSE, // Required to make the tests run on HTTPS.
+        CURLOPT_HEADERFUNCTION => array(&$this, 'curlHeaderCallback'),
+        CURLOPT_USERAGENT => $this->databasePrefix,
+      );
+      if (isset($this->httpauth_credentials)) {
+        $curl_options[CURLOPT_HTTPAUTH] = $this->httpauth_method;
+        $curl_options[CURLOPT_USERPWD] = $this->httpauth_credentials;
+      }
+      // curl_setopt_array() returns FALSE if any of the specified options
+      // cannot be set, and stops processing any further options.
+      $result = curl_setopt_array($this->curlHandle, $this->additionalCurlOptions + $curl_options);
+      if (!$result) {
+        throw new Exception('One or more cURL options could not be set.');
+      }
+
+      // 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+/', $this->databasePrefix, $matches)) {
+      curl_setopt($this->curlHandle, CURLOPT_USERAGENT, drupal_generate_test_ua($matches[0]));
+    }
+  }
+
+  /**
+   * Initializes and executes a cURL request.
+   *
+   * @param $curl_options
+   *   An associative array of cURL options to set, where the keys are constants
+   *   defined by the cURL library. For a list of valid options, see
+   *   http://www.php.net/manual/function.curl-setopt.php
+   * @param $redirect
+   *   FALSE if this is an initial request, TRUE if this request is the result
+   *   of a redirect.
+   *
+   * @return
+   *   The content returned from the call to curl_exec().
+   *
+   * @see curlInitialize()
+   */
+  protected function curlExec($curl_options, $redirect = FALSE) {
+    $this->curlInitialize();
+
+    // cURL incorrectly handles URLs with a fragment by including the
+    // fragment in the request to the server, causing some web servers
+    // to reject the request citing "400 - Bad Request". To prevent
+    // this, we strip the fragment from the request.
+    // TODO: Remove this for Drupal 8, since fixed in curl 7.20.0.
+    if (!empty($curl_options[CURLOPT_URL]) && strpos($curl_options[CURLOPT_URL], '#')) {
+      $original_url = $curl_options[CURLOPT_URL];
+      $curl_options[CURLOPT_URL] = strtok($curl_options[CURLOPT_URL], '#');
+    }
+
+    $url = empty($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 + $curl_options);
+
+    if (!$redirect) {
+      // Reset headers, the session ID and the redirect counter.
+      $this->session_id = NULL;
+      $this->headers = array();
+      $this->redirect_count = 0;
+    }
+
+    $content = curl_exec($this->curlHandle);
+    $status = curl_getinfo($this->curlHandle, CURLINFO_HTTP_CODE);
+
+    // cURL incorrectly handles URLs with fragments, so instead of
+    // letting cURL handle redirects we take of them ourselves to
+    // to prevent fragments being sent to the web server as part
+    // of the request.
+    // TODO: Remove this for Drupal 8, since fixed in curl 7.20.0.
+    if (in_array($status, array(300, 301, 302, 303, 305, 307)) && $this->redirect_count < variable_get('simpletest_maximum_redirects', 5)) {
+      if ($this->drupalGetHeader('location')) {
+        $this->redirect_count++;
+        $curl_options = array();
+        $curl_options[CURLOPT_URL] = $this->drupalGetHeader('location');
+        $curl_options[CURLOPT_HTTPGET] = TRUE;
+        return $this->curlExec($curl_options, TRUE);
+      }
+    }
+
+    $this->drupalSetContent($content, isset($original_url) ? $original_url : curl_getinfo($this->curlHandle, CURLINFO_EFFECTIVE_URL));
+    $message_vars = array(
+      '!method' => !empty($curl_options[CURLOPT_NOBODY]) ? 'HEAD' : (empty($curl_options[CURLOPT_POSTFIELDS]) ? 'GET' : 'POST'),
+      '@url' => isset($original_url) ? $original_url : $url,
+      '@status' => $status,
+      '!length' => format_size(strlen($this->drupalGetContent()))
+    );
+    $message = t('!method @url returned @status (!length).', $message_vars);
+    $this->assertTrue($this->drupalGetContent() !== 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, $header) {
+    // Header fields can be extended over multiple lines by preceding each
+    // extra line with at least one SP or HT. They should be joined on receive.
+    // Details are in RFC2616 section 4.
+    if ($header[0] == ' ' || $header[0] == "\t") {
+      // Normalize whitespace between chucks.
+      $this->headers[] = array_pop($this->headers) . ' ' . trim($header);
+    }
+    else {
+      $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.
+      $htmlDom = new DOMDocument();
+      @$htmlDom->loadHTML($this->drupalGetContent());
+      if ($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 $out;
+  }
+
+  /**
+   * Retrieve a Drupal path or an absolute path and JSON decode the result.
+   */
+  protected function drupalGetAJAX($path, array $options = array(), array $headers = array()) {
+    return drupal_json_decode($this->drupalGet($path, $options, $headers));
+  }
+
+  /**
+   * 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:
+   *
+   *   @code
+   *   // 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'));
+   *   @endcode
+   * @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:
+   *   @code
+   *   $edit = array();
+   *   $edit['name[]'] = array('value1', 'value2');
+   *   @endcode
+   * @param $submit
+   *   Value of the submit button whose click is to be emulated. For example,
+   *   t('Save'). The processing of the request depends on this value. For
+   *   example, a form may have one button with the value t('Save') and another
+   *   button with the value t('Delete'), and execute different code depending
+   *   on which one is clicked.
+   *
+   *   This function can also be called to emulate an Ajax submission. In this
+   *   case, this value needs to be an array with the following keys:
+   *   - path: A path to submit the form values to for Ajax-specific processing,
+   *     which is likely different than the $path parameter used for retrieving
+   *     the initial form. Defaults to 'system/ajax'.
+   *   - triggering_element: If the value for the 'path' key is 'system/ajax' or
+   *     another generic Ajax processing path, this needs to be set to the name
+   *     of the element. If the name doesn't identify the element uniquely, then
+   *     this should instead be an array with a single key/value pair,
+   *     corresponding to the element name and value. The callback for the
+   *     generic Ajax processing path uses this to find the #ajax information
+   *     for the element, including which specific callback to use for
+   *     processing the request.
+   *
+   *   This can also be set to NULL in order to emulate an Internet Explorer
+   *   submission of a form with a single text field, and pressing ENTER in that
+   *   textfield: under these conditions, no button information is added to the
+   *   POST data.
+   * @param $options
+   *   Options to be forwarded to url().
+   * @param $headers
+   *   An array containing additional HTTP request headers, each formatted as
+   *   "name: value".
+   * @param $form_html_id
+   *   (optional) HTML ID of the form to be submitted. On some pages
+   *   there are many identical forms, so just using the value of the submit
+   *   button is not enough. For example: 'trigger-node-presave-assign-form'.
+   *   Note that this is not the Drupal $form_id, but rather the HTML ID of the
+   *   form, which is typically the same thing but with hyphens replacing the
+   *   underscores.
+   * @param $extra_post
+   *   (optional) A string of additional data to append to the POST submission.
+   *   This can be used to add POST data for which there are no HTML fields, as
+   *   is done by drupalPostAJAX(). This string is literally appended to the
+   *   POST data, so it must already be urlencoded and contain a leading "&"
+   *   (e.g., "&extra_var1=hello+world&extra_var2=you%26me").
+   */
+  protected function drupalPost($path, $edit, $submit, array $options = array(), array $headers = array(), $form_html_id = NULL, $extra_post = NULL) {
+    $submit_matches = FALSE;
+    $ajax = is_array($submit);
+    if (isset($path)) {
+      $this->drupalGet($path, $options);
+    }
+    if ($this->parse()) {
+      $edit_save = $edit;
+      // Let's iterate over all the forms.
+      $xpath = "//form";
+      if (!empty($form_html_id)) {
+        $xpath .= "[@id='" . $form_html_id . "']";
+      }
+      $forms = $this->xpath($xpath);
+      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, $ajax ? NULL : $submit, $form);
+        $action = isset($form['action']) ? $this->getAbsoluteUrl((string) $form['action']) : $this->getUrl();
+        if ($ajax) {
+          $action = $this->getAbsoluteUrl(!empty($submit['path']) ? $submit['path'] : 'system/ajax');
+          // Ajax callbacks verify the triggering element if necessary, so while
+          // we may eventually want extra code that verifies it in the
+          // handleForm() function, it's not currently a requirement.
+          $submit_matches = TRUE;
+        }
+
+        // We post only if we managed to handle every field in edit and the
+        // submit button matches.
+        if (!$edit && ($submit_matches || !isset($submit))) {
+          $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) . $extra_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' => $value)));
+      }
+      if (!$ajax && isset($submit)) {
+        $this->assertTrue($submit_matches, t('Found the @submit button', array('@submit' => $submit)));
+      }
+      $this->fail(t('Found the requested form fields at @path', array('@path' => $path)));
+    }
+  }
+
+  /**
+   * Execute an Ajax submission.
+   *
+   * This executes a POST as ajax.js does. It uses the returned JSON data, an
+   * array of commands, to update $this->content using equivalent DOM
+   * manipulation as is used by ajax.js. It also returns the array of commands.
+   *
+   * @param $path
+   *   Location of the form containing the Ajax enabled element to test. Can be
+   *   either a Drupal path or an absolute path or NULL to use the current page.
+   * @param $edit
+   *   Field data in an associative array. Changes the current input fields
+   *   (where possible) to the values indicated.
+   * @param $triggering_element
+   *   The name of the form element that is responsible for triggering the Ajax
+   *   functionality to test. May be a string or, if the triggering element is
+   *   a button, an associative array where the key is the name of the button
+   *   and the value is the button label. i.e.) array('op' => t('Refresh')).
+   * @param $ajax_path
+   *   (optional) Override the path set by the Ajax settings of the triggering
+   *   element. In the absence of both the triggering element's Ajax path and
+   *   $ajax_path 'system/ajax' will be used.
+   * @param $options
+   *   (optional) Options to be forwarded to url().
+   * @param $headers
+   *   (optional) An array containing additional HTTP request headers, each
+   *   formatted as "name: value". Forwarded to drupalPost().
+   * @param $form_html_id
+   *   (optional) HTML ID of the form to be submitted, use when there is more
+   *   than one identical form on the same page and the value of the triggering
+   *   element is not enough to identify the form. Note this is not the Drupal
+   *   ID of the form but rather the HTML ID of the form.
+   * @param $ajax_settings
+   *   (optional) An array of Ajax settings which if specified will be used in
+   *   place of the Ajax settings of the triggering element.
+   *
+   * @return
+   *   An array of Ajax commands.
+   *
+   * @see drupalPost()
+   * @see ajax.js
+   */
+  protected function drupalPostAJAX($path, $edit, $triggering_element, $ajax_path = NULL, array $options = array(), array $headers = array(), $form_html_id = NULL, $ajax_settings = NULL) {
+    // Get the content of the initial page prior to calling drupalPost(), since
+    // drupalPost() replaces $this->content.
+    if (isset($path)) {
+      $this->drupalGet($path, $options);
+    }
+    $content = $this->content;
+    $drupal_settings = $this->drupalSettings;
+
+    // Get the Ajax settings bound to the triggering element.
+    if (!isset($ajax_settings)) {
+      if (is_array($triggering_element)) {
+        $xpath = '//*[@name="' . key($triggering_element) . '" and @value="' . current($triggering_element) . '"]';
+      }
+      else {
+        $xpath = '//*[@name="' . $triggering_element . '"]';
+      }
+      if (isset($form_html_id)) {
+        $xpath = '//form[@id="' . $form_html_id . '"]' . $xpath;
+      }
+      $element = $this->xpath($xpath);
+      $element_id = (string) $element[0]['id'];
+      $ajax_settings = $drupal_settings['ajax'][$element_id];
+    }
+
+    // Add extra information to the POST data as ajax.js does.
+    $extra_post = '';
+    if (isset($ajax_settings['submit'])) {
+      foreach ($ajax_settings['submit'] as $key => $value) {
+        $extra_post .= '&' . urlencode($key) . '=' . urlencode($value);
+      }
+    }
+    foreach ($this->xpath('//*[@id]') as $element) {
+      $id = (string) $element['id'];
+      $extra_post .= '&' . urlencode('ajax_html_ids[]') . '=' . urlencode($id);
+    }
+    if (isset($drupal_settings['ajaxPageState'])) {
+      $extra_post .= '&' . urlencode('ajax_page_state[theme]') . '=' . urlencode($drupal_settings['ajaxPageState']['theme']);
+      $extra_post .= '&' . urlencode('ajax_page_state[theme_token]') . '=' . urlencode($drupal_settings['ajaxPageState']['theme_token']);
+      foreach ($drupal_settings['ajaxPageState']['css'] as $key => $value) {
+        $extra_post .= '&' . urlencode("ajax_page_state[css][$key]") . '=1';
+      }
+      foreach ($drupal_settings['ajaxPageState']['js'] as $key => $value) {
+        $extra_post .= '&' . urlencode("ajax_page_state[js][$key]") . '=1';
+      }
+    }
+
+    // Unless a particular path is specified, use the one specified by the
+    // Ajax settings, or else 'system/ajax'.
+    if (!isset($ajax_path)) {
+      $ajax_path = isset($ajax_settings['url']) ? $ajax_settings['url'] : 'system/ajax';
+    }
+
+    // Submit the POST request.
+    $return = drupal_json_decode($this->drupalPost(NULL, $edit, array('path' => $ajax_path, 'triggering_element' => $triggering_element), $options, $headers, $form_html_id, $extra_post));
+
+    // Change the page content by applying the returned commands.
+    if (!empty($ajax_settings) && !empty($return)) {
+      // ajax.js applies some defaults to the settings object, so do the same
+      // for what's used by this function.
+      $ajax_settings += array(
+        'method' => 'replaceWith',
+      );
+      // DOM can load HTML soup. But, HTML soup can throw warnings, suppress
+      // them.
+      $dom = new DOMDocument();
+      @$dom->loadHTML($content);
+      // XPath allows for finding wrapper nodes better than DOM does.
+      $xpath = new DOMXPath($dom);
+      foreach ($return as $command) {
+        switch ($command['command']) {
+          case 'settings':
+            $drupal_settings = drupal_array_merge_deep($drupal_settings, $command['settings']);
+            break;
+
+          case 'insert':
+            $wrapperNode = NULL;
+            // When a command doesn't specify a selector, use the
+            // #ajax['wrapper'] which is always an HTML ID.
+            if (!isset($command['selector'])) {
+              $wrapperNode = $xpath->query('//*[@id="' . $ajax_settings['wrapper'] . '"]')->item(0);
+            }
+            // @todo Ajax commands can target any jQuery selector, but these are
+            //   hard to fully emulate with XPath. For now, just handle 'head'
+            //   and 'body', since these are used by ajax_render().
+            elseif (in_array($command['selector'], array('head', 'body'))) {
+              $wrapperNode = $xpath->query('//' . $command['selector'])->item(0);
+            }
+            if ($wrapperNode) {
+              // ajax.js adds an enclosing DIV to work around a Safari bug.
+              $newDom = new DOMDocument();
+              $newDom->loadHTML('<div>' . $command['data'] . '</div>');
+              $newNode = $dom->importNode($newDom->documentElement->firstChild->firstChild, TRUE);
+              $method = isset($command['method']) ? $command['method'] : $ajax_settings['method'];
+              // The "method" is a jQuery DOM manipulation function. Emulate
+              // each one using PHP's DOMNode API.
+              switch ($method) {
+                case 'replaceWith':
+                  $wrapperNode->parentNode->replaceChild($newNode, $wrapperNode);
+                  break;
+                case 'append':
+                  $wrapperNode->appendChild($newNode);
+                  break;
+                case 'prepend':
+                  // If no firstChild, insertBefore() falls back to
+                  // appendChild().
+                  $wrapperNode->insertBefore($newNode, $wrapperNode->firstChild);
+                  break;
+                case 'before':
+                  $wrapperNode->parentNode->insertBefore($newNode, $wrapperNode);
+                  break;
+                case 'after':
+                  // If no nextSibling, insertBefore() falls back to
+                  // appendChild().
+                  $wrapperNode->parentNode->insertBefore($newNode, $wrapperNode->nextSibling);
+                  break;
+                case 'html':
+                  foreach ($wrapperNode->childNodes as $childNode) {
+                    $wrapperNode->removeChild($childNode);
+                  }
+                  $wrapperNode->appendChild($newNode);
+                  break;
+              }
+            }
+            break;
+
+          // @todo Add suitable implementations for these commands in order to
+          //   have full test coverage of what ajax.js can do.
+          case 'remove':
+            break;
+          case 'changed':
+            break;
+          case 'css':
+            break;
+          case 'data':
+            break;
+          case 'restripe':
+            break;
+        }
+      }
+      $content = $dom->saveHTML();
+    }
+    $this->drupalSetContent($content);
+    $this->drupalSetSettings($drupal_settings);
+    return $return;
+  }
+
+  /**
+   * 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 (strpos($this->drupalGetContent(), '<meta ') && $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[not(@disabled)]|.//textarea[not(@disabled)]|.//select[not(@disabled)]');
+    $submit_matches = FALSE;
+    foreach ($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 'tel':
+          case 'textarea':
+          case 'url':
+          case 'number':
+          case 'range':
+          case 'color':
+          case 'hidden':
+          case 'password':
+          case 'email':
+          case 'search':
+            $post[$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];
+            $options = $this->getAllOptions($element);
+            if (is_array($new_value)) {
+              // Multiple select box.
+              if (!empty($new_value)) {
+                $index = 0;
+                $key = preg_replace('/\[\]$/', '', $name);
+                foreach ($options as $option) {
+                  $option_value = (string) $option['value'];
+                  if (in_array($option_value, $new_value)) {
+                    $post[$key . '[' . $index++ . ']'] = $option_value;
+                    $done = TRUE;
+                    unset($edit[$name]);
+                  }
+                }
+              }
+              else {
+                // No options selected: do not include any POST data for the
+                // element.
+                $done = TRUE;
+                unset($edit[$name]);
+              }
+            }
+            else {
+              // Single select box.
+              foreach ($options as $option) {
+                if ($new_value == $option['value']) {
+                  $post[$name] = $new_value;
+                  unset($edit[$name]);
+                  $done = TRUE;
+                  break;
+                }
+              }
+            }
+            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) $option['value'];
+                }
+              }
+            }
+            break;
+          case 'file':
+            break;
+          case 'submit':
+          case 'image':
+            if (isset($submit) && $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;
+  }
+
+  /**
+   * Builds an XPath query.
+   *
+   * Builds an XPath query by replacing placeholders in the query by the value
+   * of the arguments.
+   *
+   * XPath 1.0 (the version supported by libxml2, the underlying XML library
+   * used by PHP) doesn't support any form of quotation. This function
+   * simplifies the building of XPath expression.
+   *
+   * @param $xpath
+   *   An XPath query, possibly with placeholders in the form ':name'.
+   * @param $args
+   *   An array of arguments with keys in the form ':name' matching the
+   *   placeholders in the query. The values may be either strings or numeric
+   *   values.
+   * @return
+   *   An XPath query with arguments replaced.
+   */
+  protected function buildXPathQuery($xpath, array $args = array()) {
+    // Replace placeholders.
+    foreach ($args as $placeholder => $value) {
+      // XPath 1.0 doesn't support a way to escape single or double quotes in a
+      // string literal. We split double quotes out of the string, and encode
+      // them separately.
+      if (is_string($value)) {
+        // Explode the text at the quote characters.
+        $parts = explode('"', $value);
+
+        // Quote the parts.
+        foreach ($parts as &$part) {
+          $part = '"' . $part . '"';
+        }
+
+        // Return the string.
+        $value = count($parts) > 1 ? 'concat(' . implode(', \'"\', ', $parts) . ')' : $parts[0];
+      }
+      $xpath = preg_replace('/' . preg_quote($placeholder) . '\b/', $value, $xpath);
+    }
+    return $xpath;
+  }
+
+  /**
+   * 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, array $arguments = array()) {
+    if ($this->parse()) {
+      $xpath = $this->buildXPathQuery($xpath, $arguments);
+      $result = $this->elements->xpath($xpath);
+      // Some combinations of PHP / libxml versions return an empty array
+      // instead of the documented FALSE. Forcefully convert any falsish values
+      // to an empty array to allow foreach(...) constructions.
+      return $result ? $result : array();
+    }
+    else {
+      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[normalize-space(text())=:label]', array(':label' => $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[normalize-space(text())=:label]', array(':label' => $label));
+    $message = ($message ?  $message : t('Link with label %label not found.', array('%label' => $label)));
+    return $this->assert(empty($links), $message, $group);
+  }
+
+  /**
+   * Pass if a link containing a given href (part) is found.
+   *
+   * @param $href
+   *   The full or partial value of the 'href' attribute of the anchor tag.
+   * @param $index
+   *   Link position counting from zero.
+   * @param $message
+   *   Message to display.
+   * @param $group
+   *   The group this message belongs to, defaults to 'Other'.
+   *
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertLinkByHref($href, $index = 0, $message = '', $group = 'Other') {
+    $links = $this->xpath('//a[contains(@href, :href)]', array(':href' => $href));
+    $message = ($message ?  $message : t('Link containing href %href found.', array('%href' => $href)));
+    return $this->assert(isset($links[$index]), $message, $group);
+  }
+
+  /**
+   * Pass if a link containing a given href (part) is not found.
+   *
+   * @param $href
+   *   The full or partial value of the 'href' attribute of the anchor tag.
+   * @param $message
+   *   Message to display.
+   * @param $group
+   *   The group this message belongs to, defaults to 'Other'.
+   *
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertNoLinkByHref($href, $message = '', $group = 'Other') {
+    $links = $this->xpath('//a[contains(@href, :href)]', array(':href' => $href));
+    $message = ($message ?  $message : t('No link containing href %href found.', array('%href' => $href)));
+    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 sensitive 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[normalize-space(text())=:label]', array(':label' => $label));
+
+    if (isset($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 the value of the Drupal.settings JavaScript variable for the currently loaded page.
+   */
+  protected function drupalGetSettings() {
+    return $this->drupalSettings;
+  }
+
+  /**
+   * 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;
+    $this->drupalSettings = array();
+    if (preg_match('/jQuery\.extend\(Drupal\.settings, (.*?)\);/', $content, $matches)) {
+      $this->drupalSettings = drupal_json_decode($matches[1]);
+    }
+  }
+
+  /**
+   * Sets the value of the Drupal.settings JavaScript variable for the currently loaded page.
+   */
+  protected function drupalSetSettings($settings) {
+    $this->drupalSettings = $settings;
+  }
+
+  /**
+   * Pass if the internal browser's URL matches the given path.
+   *
+   * @param $path
+   *   The expected system path.
+   * @param $options
+   *   (optional) Any additional options to pass for $path to url().
+   * @param $message
+   *   Message to display.
+   * @param $group
+   *   The group this message belongs to, defaults to 'Other'.
+   *
+   * @return
+   *   TRUE on pass, FALSE on fail.
+   */
+  protected function assertUrl($path, array $options = array(), $message = '', $group = 'Other') {
+    if (!$message) {
+      $message = t('Current URL is @url.', array(
+        '@url' => var_export(url($path, $options), TRUE),
+      ));
+    }
+    $options['absolute'] = TRUE;
+    return $this->assertEqual($this->getUrl(), url($path, $options), $message, $group);
+  }
+
+  /**
+   * 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->drupalGetContent(), $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->drupalGetContent(), $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->drupalGetContent(), 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->drupalGetContent(), 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') {
+    $actual = (string) current($this->xpath('//title'));
+    if (!$message) {
+      $message = t('Page title @actual is equal to @expected.', array(
+        '@actual' => var_export($actual, TRUE),
+        '@expected' => var_export($title, TRUE),
+      ));
+    }
+    return $this->assertEqual($actual, $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') {
+    $actual = (string) current($this->xpath('//title'));
+    if (!$message) {
+      $message = t('Page title @actual is not equal to @unexpected.', array(
+        '@actual' => var_export($actual, TRUE),
+        '@unexpected' => var_export($title, TRUE),
+      ));
+    }
+    return $this->assertNotEqual($actual, $title, $message, $group);
+  }
+
+  /**
+   * Asserts themed output.
+   *
+   * @param $callback
+   *   The name of the theme function to invoke; e.g. 'links' for theme_links().
+   * @param $variables
+   *   An array of variables to pass to the theme function.
+   * @param $expected
+   *   The expected themed output string.
+   * @param $message
+   *   (optional) A message to display with the assertion. Do not translate
+   *   messages: use format_string() to embed variables in the message text, not
+   *   t(). If left blank, a default message will be displayed.
+   * @param $group
+   *   (optional) The group this message is in, which is displayed in a column
+   *   in test output. Use 'Debug' to indicate this is debugging output. Do not
+   *   translate this string. Defaults to 'Other'; most tests do not override
+   *   this default.
+   *
+   * @return
+   *   TRUE on pass, FALSE on fail.
+   */
+  protected function assertThemeOutput($callback, array $variables = array(), $expected, $message = '', $group = 'Other') {
+    $output = theme($callback, $variables);
+    $this->verbose('Variables:' . '<pre>' .  check_plain(var_export($variables, TRUE)) . '</pre>'
+      . '<hr />' . 'Result:' . '<pre>' .  check_plain(var_export($output, TRUE)) . '</pre>'
+      . '<hr />' . 'Expected:' . '<pre>' .  check_plain(var_export($expected, TRUE)) . '</pre>'
+      . '<hr />' . $output
+    );
+    if (!$message) {
+      $message = '%callback rendered correctly.';
+    }
+    $message = format_string($message, array('%callback' => 'theme_' . $callback . '()'));
+    return $this->assertIdentical($output, $expected, $message, $group);
+  }
+
+  /**
+   * Asserts that a field exists in the current page by the given XPath.
+   *
+   * @param $xpath
+   *   XPath used to find the field.
+   * @param $value
+   *   (optional) Value of the field to assert.
+   * @param $message
+   *   (optional) Message to display.
+   * @param $group
+   *   (optional) The group this message belongs to.
+   *
+   * @return
+   *   TRUE on pass, FALSE on fail.
+   */
+  protected function assertFieldByXPath($xpath, $value = NULL, $message = '', $group = 'Other') {
+    $fields = $this->xpath($xpath);
+
+    // If value specified then check array for match.
+    $found = TRUE;
+    if (isset($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;
+  }
+
+  /**
+   * Asserts that a field does not exist in the current page by the given XPath.
+   *
+   * @param $xpath
+   *   XPath used to find the field.
+   * @param $value
+   *   (optional) Value of the field to assert.
+   * @param $message
+   *   (optional) Message to display.
+   * @param $group
+   *   (optional) The group this message belongs to.
+   *
+   * @return
+   *   TRUE on pass, FALSE on fail.
+   */
+  protected function assertNoFieldByXPath($xpath, $value = NULL, $message = '', $group = 'Other') {
+    $fields = $this->xpath($xpath);
+
+    // If value specified then check array for match.
+    $found = TRUE;
+    if (isset($value)) {
+      $found = FALSE;
+      if ($fields) {
+        foreach ($fields as $field) {
+          if ($field['value'] == $value) {
+            $found = TRUE;
+          }
+        }
+      }
+    }
+    return $this->assertFalse($fields && $found, $message, $group);
+  }
+
+  /**
+   * Asserts 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 = NULL, $message = NULL) {
+    if (!isset($message)) {
+      if (!isset($value)) {
+        $message = t('Found field with name @name', array(
+          '@name' => var_export($name, TRUE),
+        ));
+      }
+      else {
+        $message = t('Found field with name @name and value @value', array(
+          '@name' => var_export($name, TRUE),
+          '@value' => var_export($value, TRUE),
+        ));
+      }
+    }
+    return $this->assertFieldByXPath($this->constructFieldXpath('name', $name), $value, $message, t('Browser'));
+  }
+
+  /**
+   * Asserts 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'));
+  }
+
+  /**
+   * Asserts 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'));
+  }
+
+  /**
+   * Asserts 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'));
+  }
+
+  /**
+   * Asserts 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]', array(':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'));
+  }
+
+  /**
+   * Asserts 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]', array(':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'));
+  }
+
+  /**
+   * Asserts that a select option in the current page is checked.
+   *
+   * @param $id
+   *   Id of select field to assert.
+   * @param $option
+   *   Option to assert.
+   * @param $message
+   *   Message to display.
+   * @return
+   *   TRUE on pass, FALSE on fail.
+   *
+   * @todo $id is unusable. Replace with $name.
+   */
+  protected function assertOptionSelected($id, $option, $message = '') {
+    $elements = $this->xpath('//select[@id=:id]//option[@value=:option]', array(':id' => $id, ':option' => $option));
+    return $this->assertTrue(isset($elements[0]) && !empty($elements[0]['selected']), $message ? $message : t('Option @option for field @id is selected.', array('@option' => $option, '@id' => $id)), t('Browser'));
+  }
+
+  /**
+   * Asserts that a select option in the current page is not checked.
+   *
+   * @param $id
+   *   Id of select field to assert.
+   * @param $option
+   *   Option to assert.
+   * @param $message
+   *   Message to display.
+   * @return
+   *   TRUE on pass, FALSE on fail.
+   */
+  protected function assertNoOptionSelected($id, $option, $message = '') {
+    $elements = $this->xpath('//select[@id=:id]//option[@value=:option]', array(':id' => $id, ':option' => $option));
+    return $this->assertTrue(isset($elements[0]) && empty($elements[0]['selected']), $message ? $message : t('Option @option for field @id is not selected.', array('@option' => $option, '@id' => $id)), t('Browser'));
+  }
+
+  /**
+   * Asserts 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), NULL, $message, $group);
+  }
+
+  /**
+   * Asserts 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), NULL, $message, $group);
+  }
+
+  /**
+   * Asserts that each HTML ID is used for just a single element.
+   *
+   * @param $message
+   *   Message to display.
+   * @param $group
+   *   The group this message belongs to.
+   * @param $ids_to_skip
+   *   An optional array of ids to skip when checking for duplicates. It is
+   *   always a bug to have duplicate HTML IDs, so this parameter is to enable
+   *   incremental fixing of core code. Whenever a test passes this parameter,
+   *   it should add a "todo" comment above the call to this function explaining
+   *   the legacy bug that the test wishes to ignore and including a link to an
+   *   issue that is working to fix that legacy bug.
+   * @return
+   *   TRUE on pass, FALSE on fail.
+   */
+  protected function assertNoDuplicateIds($message = '', $group = 'Other', $ids_to_skip = array()) {
+    $status = TRUE;
+    foreach ($this->xpath('//*[@id]') as $element) {
+      $id = (string) $element['id'];
+      if (isset($seen_ids[$id]) && !in_array($id, $ids_to_skip)) {
+        $this->fail(t('The HTML ID %id is unique.', array('%id' => $id)), $group);
+        $status = FALSE;
+      }
+      $seen_ids[$id] = TRUE;
+    }
+    return $this->assert($status, $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) {
+    $xpath = '//textarea[@' . $attribute . '=:value]|//input[@' . $attribute . '=:value]|//select[@' . $attribute . '=:value]';
+    return $this->buildXPathQuery($xpath, array(':value' => $value));
+  }
+
+  /**
+   * Asserts 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'));
+  }
+
+  /**
+   * Asserts the page did not return 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 $message
+   *   Message to display.
+   *
+   * @return
+   *   Assertion result.
+   */
+  protected function assertNoResponse($code, $message = '') {
+    $curl_code = curl_getinfo($this->curlHandle, CURLINFO_HTTP_CODE);
+    $match = is_array($code) ? in_array($curl_code, $code) : $curl_code == $code;
+    return $this->assertFalse($match, $message ? $message : t('HTTP response not expected !code, actual !curl_code', array('!code' => $code, '!curl_code' => $curl_code)), t('Browser'));
+  }
+
+  /**
+   * Asserts that the most recently sent e-mail message has the given value.
+   *
+   * The field in $name must have the content described in $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'));
+  }
+
+  /**
+   * Asserts that the most recently sent e-mail message has the string in it.
+   *
+   * @param $field_name
+   *   Name of field or message property to assert: subject, body, id, ...
+   * @param $string
+   *   String to search for.
+   * @param $email_depth
+   *   Number of emails to search for string, starting with most recent.
+   *
+   * @return
+   *   TRUE on pass, FALSE on fail.
+   */
+  protected function assertMailString($field_name, $string, $email_depth) {
+    $mails = $this->drupalGetMails();
+    $string_found = FALSE;
+    for ($i = sizeof($mails) -1; $i >= sizeof($mails) - $email_depth && $i >= 0; $i--) {
+      $mail = $mails[$i];
+      // Normalize whitespace, as we don't know what the mail system might have
+      // done. Any run of whitespace becomes a single space.
+      $normalized_mail = preg_replace('/\s+/', ' ', $mail[$field_name]);
+      $normalized_string = preg_replace('/\s+/', ' ', $string);
+      $string_found = (FALSE !== strpos($normalized_mail, $normalized_string));
+      if ($string_found) {
+        break;
+      }
+    }
+    return $this->assertTrue($string_found, t('Expected text found in @field of email message: "@expected".', array('@field' => $field_name, '@expected' => $string)));
+  }
+
+  /**
+   * Asserts that the most recently sent e-mail message has the pattern in it.
+   *
+   * @param $field_name
+   *   Name of field or message property to assert: subject, body, id, ...
+   * @param $regex
+   *   Pattern to search for.
+   *
+   * @return
+   *   TRUE on pass, FALSE on fail.
+   */
+  protected function assertMailPattern($field_name, $regex, $message) {
+    $mails = $this->drupalGetMails();
+    $mail = end($mails);
+    $regex_found = preg_match("/$regex/", $mail[$field_name]);
+    return $this->assertTrue($regex_found, t('Expected text found in @field of email message: "@expected".', array('@field' => $field_name, '@expected' => $regex)));
+  }
+
+  /**
+   * Outputs to verbose the most recent $count emails sent.
+   *
+   * @param $count
+   *   Optional number of emails to output.
+   */
+  protected function verboseEmail($count = 1) {
+    $mails = $this->drupalGetMails();
+    for ($i = sizeof($mails) -1; $i >= sizeof($mails) - $count && $i >= 0; $i--) {
+      $mail = $mails[$i];
+      $this->verbose(t('Email:') . '<pre>' . print_r($mail, TRUE) . '</pre>');
+    }
+  }
+}
+
+/**
+ * Logs verbose message in a text file.
+ *
+ * If verbose mode is enabled then page requests will be dumped to a file and
+ * presented on the test result screen. The messages will be placed in a file
+ * located in the simpletest directory in the original file system.
+ *
+ * @param $message
+ *   The verbose message to be stored.
+ * @param $original_file_directory
+ *   The original file directory, before it was changed for testing purposes.
+ * @param $test_class
+ *   The active test case class.
+ *
+ * @return
+ *   The ID of the message to be placed in related assertion messages.
+ *
+ * @see DrupalTestCase->originalFileDirectory
+ * @see DrupalWebTestCase->verbose()
+ */
+function simpletest_verbose($message, $original_file_directory = NULL, $test_class = NULL) {
+  static $file_directory = NULL, $class = NULL, $id = 1, $verbose = NULL;
+
+  // Will pass first time during setup phase, and when verbose is TRUE.
+  if (!isset($original_file_directory) && !$verbose) {
+    return FALSE;
+  }
+
+  if ($message && $file_directory) {
+    $message = '<hr />ID #' . $id . ' (<a href="' . $class . '-' . ($id - 1) . '.html">Previous</a> | <a href="' . $class . '-' . ($id + 1) . '.html">Next</a>)<hr />' . $message;
+    file_put_contents($file_directory . "/simpletest/verbose/$class-$id.html", $message, FILE_APPEND);
+    return $id++;
+  }
+
+  if ($original_file_directory) {
+    $file_directory = $original_file_directory;
+    $class = $test_class;
+    $verbose = variable_get('simpletest_verbose', TRUE);
+    $directory = $file_directory . '/simpletest/verbose';
+    $writable = file_prepare_directory($directory, FILE_CREATE_DIRECTORY);
+    if ($writable && !file_exists($directory . '/.htaccess')) {
+      file_put_contents($directory . '/.htaccess', "<IfModule mod_expires.c>\nExpiresActive Off\n</IfModule>\n");
+    }
+    return $writable;
+  }
+  return FALSE;
+}