code: def test_make_timeseries_no_args():
      df = dd.demo.make_timeseries()
      assert 1 < df.npartitions < 1000
      assert len(df.columns) > 1
      assert len(set(df.dtypes)) > 1
  
imports: from __future__ import annotations
  import pandas
  import pytest
  import dask
  import dask.dataframe
  from dask.blockwise import Blockwise, optimize_blockwise
  from dask.dataframe._compat import PANDAS_GE_200, PANDAS_GE_220, tm
  from dask.dataframe.optimize import optimize_dataframe_getitem
  from dask.dataframe.utils import assert_eq, get_string_dtype
label_desc: Use image node_id 2 for calling a global function with example usage: test_make_timeseries_no_args() without return types