test_check_contained_init
test_check_contained_init(test, "named", &contains_untouched, &contains_shuffled);
test_check_contained_init(test, "unnamed", &contains_untouched,
test_check_contained_init(test, "named", &contains_untouched, &contains_shuffled);
test_check_contained_init(test, "unnamed copy", &contains_untouched,