code: def test_str_slice():
      df = DataFrame({"a": ["abc,def,123", "xyz,hi,bye"]})
  
      ddf = dgd.from_cudf(df, 1)
      pdf = df.to_pandas()
  
      dd.assert_eq(
          pdf.a.str.split(",", expand=True, n=1),
          ddf.a.str.split(",", expand=True, n=1),
      )
      dd.assert_eq(
          pdf.a.str.split(",", expand=True, n=2),
          ddf.a.str.split(",", expand=True, n=2),
      )
  
imports: import numpy
  import pandas
  import pytest
  from pandas.testing import assert_series_equal
  from dask import dataframe
  from cudf import DataFrame, Series, date_range
  from cudf.testing._utils import assert_eq, does_not_raise
  import dask_cudf
label_desc: Use image node_id 19 for calling a global function with example usage: test_str_slice() without return types