code: def timeseries_dataframe() -> pd.DataFrame:
      """
      Returns a time series dataframe
      """
      ts_index = pd.date_range("1/1/2019", periods=1000, freq="1H")
      v1 = [randint(1, 2000) for i in range(1000)]
      test_df = pd.DataFrame({"v1": v1}, index=ts_index)
      return test_df
  
file_path: pyjanitor/tests/timeseries/test_sort_timestamps_monotonically.py
imports: from random import randint
  import pandas
  import pytest
  import janitor
  import janitor.timeseries
label_desc: Use image node_id 1 for calling a global function with example usage: timeseries_dataframe() and returns: test_df