code: def test_empty(self):
      empty = merge_memoryviews([])
      assert isinstance(empty, memoryview) and len(empty) == 0
  
file_path: distributed/distributed/protocol/tests/test_protocol_utils.py
imports: from __future__ import annotations
  import pytest
  from distributed.protocol.utils import merge_memoryviews, pack_frames, pack_frames_prelude, unpack_frames
label_desc: Use image node_id 1 for calling the TestMergeMemroyviews obj's underlying member method code with example usage: obj.test_empty() without return types