From a2b8681d1d9092eccf569da0c932d3a1f3ba9c87 Mon Sep 17 00:00:00 2001
From: Shuwen Wang <47200617+alphabetc1@users.noreply.github.com>
Date: Wed, 2 Sep 2026 02:16:45 +0800
Subject: [PATCH] [CI][MLX] Restore the mamba_branching_seqlen attribute the
 MLX runner reads off a request (#37453)

---
 .../unit/hardware_backend/mlx/test_attention_patching.py         | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/registered/unit/hardware_backend/mlx/test_attention_patching.py b/test/registered/unit/hardware_backend/mlx/test_attention_patching.py
index 2eb416e52..e58518785 100644
--- a/test/registered/unit/hardware_backend/mlx/test_attention_patching.py
+++ b/test/registered/unit/hardware_backend/mlx/test_attention_patching.py
@@ -1520,6 +1520,7 @@ if _HAS_MLX:
     class FakeRequest:
         def __init__(self):
             self.kv = ReqKvInfo()
+            self.mamba_branching_seqlen = None
             self.inflight_middle_chunks = 0
 
     class FakeTpWorker: