code: def test_abstract_base_posterior(self):
      with self.assertRaises(TypeError):
          Posterior()
  
imports: from itertools import product
  import torch
  from botorch.posteriors import GPyTorchPosterior, Posterior, PosteriorList
  from botorch.posteriors.deterministic import DeterministicPosterior
  from botorch.utils.testing import BotorchTestCase
  from gpytorch.distributions import MultivariateNormal
  from linear_operator.operators import to_linear_operator
label_desc: Use image node_id 1 for calling the TestPosterior obj's underlying member method code with example usage: obj.test_abstract_base_posterior() without return types