code: def test_cdf_zero(self):
      poisson_cdf = poisson.cdf(3, 2)
      zipoisson_cdf = zipoisson.cdf(3, 2, 0)
      assert_allclose(poisson_cdf, zipoisson_cdf, rtol=1e-12)
  
imports: import numpy
  from numpy.testing import assert_allclose, assert_equal
  from scipy import stats
  from scipy.stats import poisson, nbinom
  from statsmodels.tools.tools import Bunch
  from statsmodels.distributions.discrete import genpoisson_p, truncatedpoisson, truncatednegbin, zipoisson, zinegbin, zigenpoisson, DiscretizedCount, DiscretizedModel
label_desc: Use image node_id 5 for calling the TestZIPoisson obj's underlying member method code with example usage: obj.test_cdf_zero() without return types