code: def test_read_csv_w_bytes(tmp_path):
      df = dask.datasets.timeseries(
          dtypes={"x": int, "y": int}, freq="120s"
      ).reset_index(drop=True)
      df = pd.DataFrame(dict(x=np.arange(20), y=np.arange(20)))
      df.to_csv(tmp_path / "data-*.csv", index=False)
  
      df2 = dask_cudf.read_csv(tmp_path / "*.csv", blocksize="50 B")
      assert df2.npartitions == 3
      dd.assert_eq(df2, df, check_index=False)
  
imports: import gzip
  import os
  import warnings
  import numpy
  import pandas
  import pytest
  import dask
  from dask import dataframe
  import cudf
  import dask_cudf
label_desc: Use image node_id 8 for calling a global function with example usage: test_read_csv_w_bytes(tmp_path) without return types