[fix]解决test_model_input中报的找不到move_cache错误

tests/worker/test_model_input.py

@@ -60,6 +60,16 @@ class MockAttentionBackend(AttentionBackend):
     ) -> None:
         pass
 
+    @staticmethod
+    def move_cache(
+        kv_caches: List[torch.Tensor],
+        src_to_dists: torch.Tensor,
+        kv_cache_dtype: str, 
+        num_kv_heads: int, 
+        head_size: int,
+    ) -> None:
+        NotImplementedError
+
 
 def test_model_runner_input():
     sampling_metadata = SamplingMetadata(