code: def test_var_cov_var_normal(self, P, c, mu, sigma, expected):
      self.assertEqual(
          timeseries.var_cov_var_normal(P, c, mu, sigma), 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 TestVariance obj's underlying member method code with example usage: obj.test_var_cov_var_normal(P, c, mu, sigma, expected) without return types