code: def test_columnar_convert_column_default():
      converter = ColumnarConverter(
          name="some_name",
          default_type="foo",
          type_column=None,
          column_defaults={"before": 123},
          selected_columns={"before": "before"},
          transform_columns={},
      )
      ids, columns, type_info = converter.convert(
          {"x": _EMPTY_DF, "y": _EMPTY_DF}
      )
  
      _check_type_info(
          type_info, [("x", _empty_array(2)), ("y", _empty_array(2))]
      )
      np.testing.assert_array_equal(columns["before"], 123)
  
imports: import networkx
  import numpy
  import pandas
  import pytest
  from stellargraph.core.convert import ColumnarConverter, convert_nodes, convert_edges, from_networkx
  from stellargraph.core.indexed_array import IndexedArray
label_desc: Use image node_id 6 for calling a global function with example usage: test_columnar_convert_column_default() without return types