code: def test_drop_duplicates(self, keep, expected, index, idx):
      # to check Index/Series compat
      idx = idx.append(idx[:5])
  
      tm.assert_numpy_array_equal(idx.duplicated(keep=keep), expected)
      expected = idx[~expected]
  
      result = idx.drop_duplicates(keep=keep)
      tm.assert_index_equal(result, expected)
  
      result = Series(idx).drop_duplicates(keep=keep)
      expected = Series(expected, index=index)
      tm.assert_series_equal(result, expected)
  
file_path: pandas/pandas/tests/indexes/datetimelike_/test_drop_duplicates.py
imports: import numpy
  import pytest
  from pandas import PeriodIndex, Series, date_range, period_range, timedelta_range
  import pandas._testing
label_desc: Use image node_id 2 for calling the DropDuplicates obj's underlying member method code with example usage: obj.test_drop_duplicates(keep, expected, index, idx) without return types