Page callback to initialize authorize.php during testing.
function system_test_authorize_init_page($page_title) {
$authorize_url = $GLOBALS['base_url'] . '/authorize.php';
system_authorized_init('system_test_authorize_run', drupal_get_path('module', 'system_test') . '/system_test.module', array(), $page_title);
drupal_goto($authorize_url);
}