diff --git a/tests/AcDream.Core.Tests/World/TeleportAnimSequencerTests.cs b/tests/AcDream.Core.Tests/World/TeleportAnimSequencerTests.cs
index fb712d7f..1b200eef 100644
--- a/tests/AcDream.Core.Tests/World/TeleportAnimSequencerTests.cs
+++ b/tests/AcDream.Core.Tests/World/TeleportAnimSequencerTests.cs
@@ -452,4 +452,19 @@ public sealed class TeleportAnimSequencerTests
         Assert.False(seq.IsActive);
         Assert.Equal(TeleportAnimState.Off, seq.State);
     }
+
+    // --- Task 1.6: EnterTunnel fired for Portal path via Begin() ---
+
+    [Fact]
+    public void Portal_EmitsEnterTunnel_OnFirstTick()
+    {
+        // Portal begins directly in Tunnel; EnterTunnel signals "world is now hidden".
+        var seq = new TeleportAnimSequencer();
+        seq.Begin(TeleportEntryKind.Portal);
+
+        // First tick: should emit PlayEnterSound AND EnterTunnel (both on entry)
+        var (_, evts) = seq.Tick(0f, worldReady: false);
+        Assert.Contains(TeleportAnimEvent.PlayEnterSound, evts);
+        Assert.Contains(TeleportAnimEvent.EnterTunnel,   evts);
+    }
 }