code: def test_dcov(self):
      assert_almost_equal(
          ddm.distance_covariance(self.x, self.y), self.dcov_exp, 4
      )
  
imports: import numpy
  from numpy.testing import assert_almost_equal
  import pytest
  from statsmodels.datasets import get_rdataset
  from statsmodels.datasets.tests.test_utils import IGNORED_EXCEPTIONS
  import statsmodels.stats.dist_dependence_measures
  from statsmodels.tools.sm_exceptions import HypothesisTestWarning
label_desc: Use image node_id 12 for calling the TestDistDependenceMeasures obj's underlying member method code with example usage: obj.test_dcov() without return types