Complete first release candidate audit (#107)

crates/libremetaverse/tests/network_manager.rs

@@ -1,3 +1,8 @@
+#![allow(clippy::await_holding_lock)] // The process-wide guard serializes socket integration tests.
+#![allow(clippy::float_cmp)] // Wire fixtures use exactly representable values.
+#![allow(clippy::items_after_statements)] // Local constants stay next to their concurrency scenario.
+#![allow(clippy::too_many_lines)] // End-to-end fixtures keep each protocol exchange contiguous.
+
 use libremetaverse::http::DownloadManager;
 use libremetaverse::interfaces::IMessage;
 use libremetaverse::messages::linden::{
@@ -14,7 +19,7 @@ use libremetaverse::{
     InventoryItem, LoginState, LoginStatus, NetworkManager, NetworkManagerDisconnectType,
     NetworkManagerLoginResponseCallback, PacketEventDictionary, Simulator,
 };
-use libremetaverse_structured_data::{OSD, OSDParser};
+use libremetaverse_structured_data::{OSD, OSDMap, OSDParser};
 use libremetaverse_types::compat::{
     CancellationTokenSource, EventHandler, HttpMessageHandler, HttpRequest, HttpResponse, Uri,
 };
@@ -287,7 +292,15 @@ fn abort_and_callback_unregistration_preserve_reference_noop_behavior() {
 }
 
 struct TestCapsMessage;
-impl IMessage for TestCapsMessage {}
+impl IMessage for TestCapsMessage {
+    fn deserialize(&mut self, _map: OSDMap) -> Result<(), Error> {
+        Ok(())
+    }
+
+    fn serialize(&self) -> Result<OSDMap, Error> {
+        OSDMap::new_with_constructor()
+    }
+}
 
 #[test]
 fn caps_callbacks_are_ordered_and_subscription_guards_unregister() {