code: def idx(self, freq_sample):
      return date_range(
          "2011-01-01", freq=freq_sample, periods=10, name="idx"
      )
  
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 1 for calling the TestDropDuplicatesDatetimeIndex obj's underlying member method code with example usage: obj.idx(freq_sample) and returns: date_range