code: def test_normalize(self, returns, expected):
      self.assertTrue(timeseries.normalize(returns).equals(expected))
  
imports: from __future__ import division
  import os
  from unittest import TestCase
  from nose_parameterized import parameterized
  from numpy.testing import assert_allclose, assert_almost_equal
  from pandas.util.testing import assert_series_equal
  import numpy
  import pandas
  from ..None import timeseries
  from pyfolio.utils import to_utc, to_series
  import gzip
label_desc: Use image node_id 1 for calling the TestNormalize obj's underlying member method code with example usage: obj.test_normalize(returns, expected) without return types