code: def test_convert_almost_null_slice(self, index):
      # slice with None at both ends, but not step
  
      key = slice(None, None, "foo")
  
      if isinstance(index, IntervalIndex):
          msg = "label-based slicing with step!=1 is not supported for IntervalIndex"
          with pytest.raises(ValueError, match=msg):
              index._convert_slice_indexer(key, "loc")
      else:
          msg = (
              "'>=' not supported between instances of 'str' and 'int'"
          )
          with pytest.raises(TypeError, match=msg):
              index._convert_slice_indexer(key, "loc")
  
imports: import numpy
  import pytest
  from pandas.errors import InvalidIndexError
  from pandas.core.dtypes.common import is_float_dtype, is_scalar
  from pandas import NA, DatetimeIndex, Index, IntervalIndex, MultiIndex, NaT, PeriodIndex, TimedeltaIndex
  import pandas._testing
label_desc: Use image node_id 1 for calling the TestConvertSliceIndexer obj's underlying member method code with example usage: obj.test_convert_almost_null_slice(index) without return types