code: def test_rvs(self):
      # copied from student t test,
      # currently inconsistent with non-elliptical copulas
      super().test_rvs()
  
      chi2t, rvs = check_cop_rvs(
          self.copula, rvs=self.rvs, nobs=2000, k=10, use_pdf=True
      )
      assert chi2t.pvalue > 0.1
      tau = stats.kendalltau(*rvs.T)[0]
      tau_cop = self.copula.tau()
      assert_allclose(tau, tau_cop, rtol=0.05)
  
      corr_est = self.copula.fit_corr_param(rvs)
      assert_allclose(corr_est, 0.8, rtol=0.1)
  
imports: import warnings
  from statsmodels.compat.pytest import pytest_warns
  from statsmodels.compat.scipy import SP_LT_15
  import numpy
  from numpy.testing import assert_allclose, assert_array_almost_equal
  import pytest
  from scipy import stats
  from statsmodels.distributions.copula.archimedean import ArchimedeanCopula, ClaytonCopula, FrankCopula, GumbelCopula, _debyem1_expansion
  from statsmodels.distributions.copula.copulas import CopulaDistribution
  import statsmodels.distributions.copula.depfunc_ev
  from statsmodels.distributions.copula.elliptical import GaussianCopula, StudentTCopula
  from statsmodels.distributions.copula.extreme_value import ExtremeValueCopula, copula_bv_ev
  from statsmodels.distributions.copula.other_copulas import IndependenceCopula
  import statsmodels.distributions.copula.transforms
  from statsmodels.distributions.tools import approx_copula_pdf, frequencies_fromdata
  from statsmodels.tools.numdiff import approx_fprime_cs, approx_hess
label_desc: Use image node_id 1 for calling the TestGaussianCopula obj's underlying member method code with example usage: obj.test_rvs() without return types