fix(tests): Resolve late binding of loop variable in assert message lambda (vllm-project#26249)

Signed-off-by: lyd1992 <liuyudong@iscas.ac.cn>
Signed-off-by: ihb2032 <1355790728@qq.com

Author: ihb2032

tests/kernels/mamba/test_mamba_ssm_ssd.py

@@ -562,15 +562,15 @@ def test_mamba_chunk_scan_cont_batch_prefill_chunking(chunk_size, seqlens):
             Y_ref_seq[: chunked_seqlens[i], ...],
             atol=atol,
             rtol=rtol,
-            msg=lambda x: f"seq{i} output part1 " + x,
-        )  # noqa: B023
+            msg=lambda x, i=i: f"seq{i} output part1 " + x,
+        )
         torch.testing.assert_close(
             Y_seq[chunked_seqlens[i] :, ...],
             Y_ref_seq[chunked_seqlens[i] :, ...],
             atol=atol,
             rtol=rtol,
-            msg=lambda x: f"seq{i} output part2 " + x,
-        )  # noqa: B023
+            msg=lambda x, i=i: f"seq{i} output part2 " + x,
+        )
 
         state_seq = state_chunked[i]
         state_seq_ref = state_ref[i]
@@ -579,5 +579,5 @@ def test_mamba_chunk_scan_cont_batch_prefill_chunking(chunk_size, seqlens):
             state_seq_ref,
             atol=atol,
             rtol=rtol,
-            msg=lambda x: f"seq{i} state " + x,
-        )  # noqa: B023
+            msg=lambda x, i=i: f"seq{i} state " + x,
+        )