code: def test_np_consts() -> None:
      assert bus.NP_EPOCH == np.datetime64(0, "ms")
      assert bus.NP_MS_DELTA == np.timedelta64(1, "ms")
  
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 3 for calling a global function with example usage: test_np_consts() without return types