code: def test_pickle(self):
      view = self.av
      pview = pickle.loads(pickle.dumps(view, -1))
      assert view == pview
      assert view.__slots__ == pview.__slots__
  
imports: import pickle
  import pytest
  import networkx
label_desc: Use image node_id 2 for calling the TestUnionAtlas obj's underlying member method code with example usage: obj.test_pickle() without return types