code: def _make_dataframe(index, size=10):
      """Create a new random dataframe of `size` and with a DateTimeIndex of
      frequency `time_unit`.
      """
      return pd.DataFrame(
          index=index,
          data={
              "a": np.random.rand(size),
              "b": np.random.rand(size),
              "c": np.random.rand(size),
              "d": np.random.rand(size),
          },
      )
  
imports: from datetime import datetime
  import numpy
  import pandas
  import pyarrow
  from pytest import fixture
  from random import random, randint, choice
  from faker import Faker
label_desc: Use image node_id 3 for calling a global function with example usage: _make_dataframe(index, size) and returns: pd