code: def test_fantasy_call(self, *args, **kwargs):
      with self.assertRaises(NotImplementedError):
          super().test_fantasy_call(*args, **kwargs)
  
imports: import unittest
  import torch
  import gpytorch
  from gpytorch.test.variational_test_case import VariationalTestCase
label_desc: Use image node_id 18 for calling the TestVNNGP obj's underlying member method code with example usage: obj.test_fantasy_call() without return types