code: def test_splitting():
      df = pd.DataFrame(dict(a=["a,a,a"]))
  
      data_id, column_type = "1", "split"
      build_data_inst({data_id: df})
  
      builder = ColumnBuilder(
          data_id,
          column_type,
          "a_split",
          {"col": "a", "delimiter": ","},
      )
  
      def _test(col):
          assert list(col.columns) == [
              "a_split_0",
              "a_split_1",
              "a_split_2",
          ]
          return list(col.loc[0, :].values) == ["a", "a", "a"]
  
      verify_builder(builder, _test)
  
imports: import numpy
  import pandas
  import pytest
  import sklearn
  from numpy.random import randn
  from pkg_resources import parse_version
  from six import PY3
  import dtale.pandas_util
  from dtale.column_builders import ColumnBuilder, ZERO_STD_ERROR
  from tests.dtale import build_data_inst
label_desc: Use image node_id 9 for calling a global function with example usage: test_splitting() and returns: unknown