code: def test_notimplemented_errors(self):
      posterior = NotSoAbstractPosterior()
      with self.assertRaisesRegex(
          AttributeError, "NotSoAbstractPosterior"
      ):
          posterior.mean
      with self.assertRaisesRegex(
          AttributeError, "NotSoAbstractPosterior"
      ):
          posterior.variance
      with self.assertRaisesRegex(
          NotImplementedError, "not implement `_extended_shape`"
      ):
          posterior._extended_shape()
      with self.assertRaisesRegex(
          NotImplementedError, "not implement `batch_range`"
      ):
          posterior.batch_range
  
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 2 for calling the TestPosterior obj's underlying member method code with example usage: obj.test_notimplemented_errors() without return types