Test menu_set_item().
function testMenuSetItem() {
$item = menu_get_item('test-page');
$this
->assertEqual($item['path'], 'test-page', "Path from menu_get_item('test-page') is equal to 'test-page'", 'menu');
// Modify the path for the item then save it.
$item['path'] = 'test-page-test';
$item['href'] = 'test-page-test';
menu_set_item('test-page', $item);
$compare_item = menu_get_item('test-page');
$this
->assertEqual($compare_item, $item, 'Modified menu item is equal to newly retrieved menu item.', 'menu');
}