code: def test_cumsum_groupby(custom_data):
      data_id, column_type = "1", "cumsum"
      build_data_inst({data_id: custom_data})
  
      builder = ColumnBuilder(
          data_id,
          column_type,
          "Col0",
          {"col": "int_val", "group": ["security_id"]},
      )
      verify_builder(builder, lambda col: col.max() > 0)
  
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 7 for calling a global function with example usage: test_cumsum_groupby(custom_data) without return types