assert_se(!uid_range_contains(p, n, 499));
assert_se(uid_range_contains(p, n, 500));
assert_se(uid_range_contains(p, n, 999));
assert_se(!uid_range_contains(p, n, 1000));
assert_se(!uid_range_contains(p, n, 499));
assert_se(uid_range_contains(p, n, 500));
assert_se(uid_range_contains(p, n, 999));
assert_se(!uid_range_contains(p, n, 1000));