code: def test_poisson(self):
      self.generate(lam=self.lam, size=(3, 2))
  
imports: import functools
  import unittest
  import numpy
  import cupy
  from cupy import testing
  from cupy.testing import _condition
label_desc: Use image node_id 1 for calling the Poisson obj's underlying member method code with example usage: obj.test_poisson() without return types