code: def test_round_empty_not_input(self):
      # GH#51032
      df = DataFrame()
      result = df.round()
      tm.assert_frame_equal(df, result)
      assert df is not result
  
file_path: pandas/pandas/tests/frame/methods/test_round.py
imports: import numpy
  import pytest
  import pandas
  from pandas import DataFrame, Series, date_range
  import pandas._testing
label_desc: Use image node_id 9 for calling the TestDataFrameRound obj's underlying member method code with example usage: obj.test_round_empty_not_input() without return types