fix: harden OpenSim session readiness

crates/libremetaverse/tests/network_manager.rs

@@ -536,9 +536,18 @@ fn spawn_fake_server() -> FakeServer {
         socket.send_to(&ack(sequence), client_endpoint).unwrap();
 
         let mut handshake = RegionHandshakePacket::new_with_constructor().unwrap();
-        handshake.region_info.sim_name = b"Fake Region".to_vec();
-        let mut bytes = handshake.to_bytes_with_method().unwrap();
-        bytes[0] &= !(Helpers::MSG_RELIABLE | Helpers::MSG_ZEROCODED);
+        handshake.region_info.sim_name = b"Fake Region\0".to_vec();
+        handshake.region_info.water_height = 21.5;
+        handshake.region_info2.region_id = UUID::new_with_u_int64(99).unwrap();
+        let raw = handshake.to_bytes_with_method().unwrap();
+        let mut bytes = vec![0_u8; raw.len().saturating_mul(2).saturating_add(2)];
+        let length = Helpers::zero_encode(
+            Some(&raw),
+            i32::try_from(raw.len()).unwrap(),
+            Some(&mut bytes),
+        )
+        .unwrap();
+        bytes.truncate(usize::try_from(length).unwrap());
         socket.send_to(&bytes, client_endpoint).unwrap();
 
         loop {
@@ -833,6 +842,9 @@ fn fake_server_drives_circuit_handshake_ping_disable_and_disconnect_reasons() {
     assert_eq!(sim.seed_capability(), Some(seed));
     assert_eq!(sim.size_x, 512);
     assert_eq!(sim.size_y, 256);
+    assert_eq!(sim.name, "Fake Region");
+    assert_eq!(sim.region_id, UUID::new_with_u_int64(99).unwrap());
+    assert_eq!(sim.water_height, 21.5);
     wait_until(|| sim.handshake_complete());
     assert_eq!(
         server.reports.recv_timeout(Duration::from_secs(1)).unwrap(),