function saveUserPicture($image) {
$edit = array(
'files[picture_upload]' => drupal_realpath($image->uri),
);
$this
->drupalPost('user/' . $this->user->uid . '/edit', $edit, t('Save'));
// Load actual user data from database.
$account = user_load($this->user->uid, TRUE);
return isset($account->picture) ? $account->picture->uri : NULL;
}