code: def test_variableoffsetwindowindexer_not_offset():
      # GH 54379
      idx = date_range("2020", periods=10)
      with pytest.raises(
          ValueError, match="offset must be a DateOffset-like object."
      ):
          VariableOffsetWindowIndexer(index=idx, offset="foo")
  
imports: import numpy
  import pytest
  from pandas import DataFrame, MultiIndex, Series, concat, date_range
  import pandas._testing
  from pandas.api.indexers import BaseIndexer, FixedForwardWindowIndexer
  from pandas.core.indexers.objects import ExpandingIndexer, FixedWindowIndexer, VariableOffsetWindowIndexer
  from pandas.tseries.offsets import BusinessDay
label_desc: Use image node_id 10 for calling a global function with example usage: test_variableoffsetwindowindexer_not_offset() without return types