code: def test_get_extended_base_sample_shape(self):
      sampler = NonAbstractSampler(sample_shape=torch.Size([4]))
      posterior = MockPosterior(base_shape=torch.Size([3, 2]))
      self.assertEqual(
          sampler._get_extended_base_sample_shape(posterior=posterior),
          torch.Size([4, 3, 2]),
      )
      posterior = MockPosterior(base_shape=torch.Size([3, 5, 3, 2]))
      bss = sampler._get_extended_base_sample_shape(posterior=posterior)
      self.assertEqual(bss, torch.Size([4, 3, 5, 3, 2]))
  
file_path: botorch/test/sampling/test_base.py
imports: import torch
  from botorch.exceptions.errors import InputDataError
  from botorch.sampling.base import MCSampler
  from botorch.utils.testing import BotorchTestCase, MockPosterior
label_desc: Use image node_id 5 for calling the TestBaseMCSampler obj's underlying member method code with example usage: obj.test_get_extended_base_sample_shape() without return types