code: def test(self):
      e1 = cudnn.CuDNNError(1)
      e2 = pickle.loads(pickle.dumps(e1))
      assert e1.args == e2.args
      assert str(e1) == str(e2)
  
imports: import pickle
  import unittest
  from cupy.cuda import cudnn
label_desc: Use image node_id 1 for calling the TestExceptionPicklable obj's underlying member method code with example usage: obj.test() without return types