code: def test_pickle_method_before_evaluation(self):
      c1 = Counter()
      c2 = pickle.loads(pickle.dumps(c1))
      c1.increment()
      self.assertEqual(c1.call_count, 1)
      self.assertEqual(c2.call_count, 0)
      c2.increment()
      self.assertEqual(c1.call_count, 1)
      self.assertEqual(c2.call_count, 1)
  
imports: import pickle
  from absl.testing import absltest
  from absl.testing import parameterized
  from sonnet.src import once
label_desc: Use image node_id 6 for calling the OnceTest obj's underlying member method code with example usage: obj.test_pickle_method_before_evaluation() without return types