code: def test_dropna_preserve_name(self, datetime_series):
      datetime_series[:5] = np.nan
      result = datetime_series.dropna()
      assert result.name == datetime_series.name
      name = datetime_series.name
      ts = datetime_series.copy()
      return_value = ts.dropna(inplace=True)
      assert return_value is None
      assert ts.name == name
  
file_path: pandas/pandas/tests/series/methods/test_dropna.py
imports: import numpy
  import pytest
  from pandas import DatetimeIndex, IntervalIndex, NaT, Period, Series, Timestamp
  import pandas._testing
label_desc: Use image node_id 2 for calling the TestDropna obj's underlying member method code with example usage: obj.test_dropna_preserve_name(datetime_series) without return types