assert_se(sd_dhcp_client_set_index(client, 15) == 0);
assert_se(sd_dhcp_client_set_index(client, -42) == -EINVAL);
- assert_se(sd_dhcp_client_set_index(client, -1) == 0);
+ assert_se(sd_dhcp_client_set_index(client, -1) == -EINVAL);
+ assert_se(sd_dhcp_client_set_index(client, 0) == -EINVAL);
+ assert_se(sd_dhcp_client_set_index(client, 1) == 0);
assert_se(sd_dhcp_client_set_request_option(client,
DHCP_OPTION_SUBNET_MASK) == -EEXIST);