code: def test_at_time_errors(self, hour):
      # GH#24043
      dti = date_range("2018", periods=3, freq="h")
      df = DataFrame(list(range(len(dti))), index=dti)
      if getattr(hour, "tzinfo", None) is None:
          result = df.at_time(hour)
          expected = df.iloc[1:2]
          tm.assert_frame_equal(result, expected)
      else:
          with pytest.raises(
              ValueError, match="Index must be timezone"
          ):
              df.at_time(hour)
  
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 5 for calling the TestAtTime obj's underlying member method code with example usage: obj.test_at_time_errors(hour) without return types