code: def test_is_all_dates(idx):
      assert not idx._is_all_dates
  
imports: import numpy
  import pytest
  from pandas.core.dtypes.common import is_any_real_numeric_dtype
  import pandas
  from pandas import Index, MultiIndex, Series
  import pandas._testing
label_desc: Use image node_id 11 for calling a global function with example usage: test_is_all_dates(idx) without return types