docstr: Tests that correct number of negatives are sampled.
code: def test_negatives(self):
      """Tests that correct number of negatives are sampled."""
      model = PoincareModel(self.data, negative=5)
      self.assertEqual(len(model._get_candidate_negatives()), 5)
  
imports: import logging
  import os
  import tempfile
  import unittest
  import numpy
  from gensim.models.poincare import PoincareRelations, PoincareModel, PoincareKeyedVectors
  from gensim.test.utils import datapath
label_desc: Use image node_id 21 for calling the TestPoincareModel obj's underlying member method code with example usage: obj.test_negatives() without return types