code: def test_at_time_nonexistent(self, frame_or_series):
      # time doesn't exist
      rng = date_range("1/1/2012", freq="23Min", periods=384)
      ts = DataFrame(
          np.random.default_rng(2).standard_normal(len(rng)), rng
      )
      ts = tm.get_obj(ts, frame_or_series)
      rs = ts.at_time("16:00")
      assert len(rs) == 0
  
file_path: pandas/pandas/tests/frame/methods/test_at_time.py
imports: from datetime import time
  import numpy
  import pytest
  import pytz
  from pandas._libs.tslibs import timezones
  from pandas import DataFrame, date_range
  import pandas._testing
label_desc: Use image node_id 4 for calling the TestAtTime obj's underlying member method code with example usage: obj.test_at_time_nonexistent(frame_or_series) without return types