diff --git a/SVSim.UnitTests/BattleNode/Lifecycle/TypedBodyWireShapeTests.cs b/SVSim.UnitTests/BattleNode/Lifecycle/TypedBodyWireShapeTests.cs
index f35e54f..ce9a57f 100644
--- a/SVSim.UnitTests/BattleNode/Lifecycle/TypedBodyWireShapeTests.cs
+++ b/SVSim.UnitTests/BattleNode/Lifecycle/TypedBodyWireShapeTests.cs
@@ -170,6 +170,18 @@ public class TypedBodyWireShapeTests
         Assert.That(node["uri"]!.GetValue<string>(), Is.EqualTo("TurnEnd"));
     }
 
+    [Test]
+    public void BuildOpponentJudge_SerializesSpinAndResultCode()
+    {
+        var env = ScriptedLifecycle.BuildOpponentJudge();
+        var json = MsgEnvelope.ToJson(env);
+        var node = JsonNode.Parse(json)!.AsObject();
+
+        Assert.That(node["spin"]!.GetValue<int>(), Is.EqualTo(100));
+        Assert.That(node["resultCode"]!.GetValue<int>(), Is.EqualTo(1));
+        Assert.That(node["uri"]!.GetValue<string>(), Is.EqualTo("Judge"));
+    }
+
     /// <summary>
     /// Wire-shape fixture: 30 copies of the legacy DummyCardId (100_011_010L) so the
     /// existing literal assertions on <c>selfDeck[0].cardId</c> (line 81 above) keep working