code: def test_transform_array(dt) -> None:
      a = np.empty(shape=10, dtype=dt)
      out = bus.transform_array(a)
      assert isinstance(out, np.ndarray)
  
imports: from __future__ import annotations
  import pytest
  import datetime
  from math import inf, nan
  import numpy
  import pandas
  import pytz
  from tests.support.util.env import envset
  import bokeh.util.serialization
label_desc: Use image node_id 18 for calling a global function with example usage: test_transform_array(dt) without return types