code: def test_dropna_invalid_arguments_how(axis, how, remember):
      """Test that invalid arguments for how are not accepted."""
      with pytest.raises(ValueError):
          DropNA(axis=axis, how=how, thresh=None, remember=remember)
  
file_path: sktime/sktime/transformations/series/tests/test_dropna.py
imports: import numpy
  import pytest
  from sktime.datasets import load_longley
  from sktime.transformations.series.dropna import DropNA
  from sktime.utils._testing.estimator_checks import _assert_array_almost_equal
label_desc: Use image node_id 8 for calling a global function with example usage: test_dropna_invalid_arguments_how(axis, how, remember) without return types