class_docstr: Test of the generic dictionary interface.
class_docstr_tok: ["Test","of","the","generic","dictionary","interface","."]
code: def test_dataset_allow_none_values(self):
      ds = Dataset({"x": None, "y": [0, 1]}, kdims=["x", "y"])
      self.assertEqual(ds.dimension_values(0), np.array([None, None]))
  
file_path: holoviews/holoviews/tests/core/data/test_dictinterface.py
imports: import numpy
  from holoviews.core.data import Dataset
  from .base import HeterogeneousColumnTests, InterfaceTests, ScalarColumnTests
label_desc: Use image node_id 6 for calling the DictDatasetTest obj's underlying member method code with example usage: obj.test_dataset_allow_none_values() without return types