code: def test_gross_lev_calculation(self):
      assert_series_equal(
          timeseries.gross_lev(self.test_pos)["2004-02-01":],
          self.test_gross_lev["2004-02-01":],
          check_names=False,
      )
  
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 TestGrossLev obj's underlying member method code with example usage: obj.test_gross_lev_calculation() without return types