Complete standalone NAT forward configuration fixture

tests/test_nat_engine.c

@@ -1009,7 +1009,7 @@ static void test_static_forward_owners(void) {
         PASS();
     }
     TEST("static_forward_config_and_rollback");
-    const char* text = "[nat]\nforward=udp:1234:10.0.0.2:40000:80\n";
+    const char* text = "[nat]\ntun_ip=10.0.0.1\nport_start=10000\nport_end=20000\nforward=udp:1234:10.0.0.2:40000:80\n";
     struct utun_config* config = parse_config_from_buf(text, strlen(text), "nat-forward-valid");
     ASSERT(config && config->global.nat_forward_count == 1, "forward config parsed");
     struct eim_nat_ctx ctx;