code: def test_additive(stability, skew0, skew1, scale0, scale1):
      num_samples = 10000
      d0 = dist.Stable(stability, skew0, scale0, coords="S")
      d1 = dist.Stable(stability, skew1, scale1, coords="S")
      expected = d0.sample([num_samples]) + d1.sample([num_samples])
  
      scale = (scale0**stability + scale1**stability) ** (
          1 / stability
      )
      skew = (
          skew0 * scale0**stability + skew1 * scale1**stability
      ) / (scale0**stability + scale1**stability)
      d = dist.Stable(stability, skew, scale, coords="S")
      actual = d.sample([num_samples])
  
      assert ks_2samp(expected, actual).pvalue > 0.03
  
file_path: pyro/tests/distributions/test_stable.py
imports: import warnings
  import pytest
  import torch
  from scipy.integrate.quadpack import IntegrationWarning
  from scipy.stats import ks_2samp, kstest, levy_stable
  import pyro.distributions
  import pyro.distributions.stable
  from tests.common import assert_close
label_desc: Use image node_id 5 for calling a global function with example usage: test_additive(stability, skew0, skew1, scale0, scale1) without return types