docstr: Test that distance returns expected values.
code: def test_distance(self):
      """Test that distance returns expected values."""
      self.assertTrue(
          np.allclose(
              self.vectors.distance("dog.n.01", "mammal.n.01"),
              4.5278745,
          )
      )
      self.assertEqual(self.vectors.distance("dog.n.01", "dog.n.01"), 0)
  
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 8 for calling the TestPoincareKeyedVectors obj's underlying member method code with example usage: obj.test_distance() without return types