code: def test_pickle(self):
      e1 = cusparse.CuSparseError(1)
      e2 = pickle.loads(pickle.dumps(e1))
      assert e1.args == e2.args
      assert str(e1) == str(e2)
  
imports: import pickle
  import unittest
  import cupy
  from cupy.cuda import cusparse
label_desc: Use image node_id 2 for calling the TestException obj's underlying member method code with example usage: obj.test_pickle() without return types