code: def test_invalid_num_classes(self):
      sufficiency = Sufficiency(2, 2)
      C = 2 * torch.eye(3).long()
      Y = torch.eye(3).long()
      A = torch.eye(3).long()
      with pytest.raises(ConfigurationError):
          sufficiency(C, Y, A)
  
imports: import pytest
  import torch
  import math
  import numpy
  from allennlp.common.checks import ConfigurationError
  from allennlp.common.testing import AllenNlpTestCase, multi_device, global_distributed_metric, run_distributed_test
  from allennlp.fairness.fairness_metrics import Independence, Separation, Sufficiency
label_desc: Use image node_id 2 for calling the SufficiencyTest obj's underlying member method code with example usage: obj.test_invalid_num_classes() without return types