code: def setup_class(cls):
      cls.scale = 2
      cls.dist1 = stats.norm(1, 2)
      cls.mvsk = [1.0, 2**2, 0, 0]
      cls.dist2 = NormExpan_gen(cls.mvsk, mode="mvsk")
  
file_path: statsmodels/statsmodels/sandbox/distributions/tests/test_norm_expan.py
imports: import pytest
  import numpy
  from scipy import stats
  from numpy.testing import assert_allclose, assert_array_less
  from statsmodels.sandbox.distributions.extras import NormExpan_gen
label_desc: Use image node_id 1 for calling the TestExpandNormMom obj's underlying member method code with example usage: obj.setup_class(cls) without return types