code: def test_quantile_interpolation(self, datetime_series):
      # see gh-10174
  
      # interpolation = linear (default case)
      q = datetime_series.quantile(0.1, interpolation="linear")
      assert q == np.percentile(datetime_series.dropna(), 10)
      q1 = datetime_series.quantile(0.1)
      assert q1 == np.percentile(datetime_series.dropna(), 10)
  
      # test with and without interpolation keyword
      assert q == q1
  
imports: import numpy
  import pytest
  from pandas.core.dtypes.common import is_integer
  import pandas
  from pandas import Index, Series
  import pandas._testing
  from pandas.core.indexes.datetimes import Timestamp
label_desc: Use image node_id 3 for calling the TestSeriesQuantile obj's underlying member method code with example usage: obj.test_quantile_interpolation(datetime_series) without return types