code: def test_catch_gaps(self, slices):
      base = bytearray(range(10))
      base_mv = memoryview(base)
  
      parts = [base_mv[s] for s in slices]
      with pytest.raises(
          ValueError, match="does not start where the previous ends"
      ):
          merge_memoryviews(parts)
  
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 6 for calling the TestMergeMemroyviews obj's underlying member method code with example usage: obj.test_catch_gaps(slices) without return types