docstr: Test that distance returns expected values.
docstr_tok: ["Test","that","distance","returns","expected","values","."]
code: def test_distance(self):
      """Test that distance returns expected values."""
      self.assertTrue(
          np.allclose(
              self.vectors.distance("war", "conflict"), 0.06694602
          )
      )
      self.assertEqual(self.vectors.distance("war", "war"), 0)
  
imports: import functools
  import logging
  import unittest
  import numpy
  from gensim.models.keyedvectors import KeyedVectors, REAL, pseudorandom_weak_vector
  from gensim.test.utils import datapath
  import gensim.models.keyedvectors
label_desc: Use image node_id 17 for calling the TestKeyedVectors obj's underlying member method code with example usage: obj.test_distance() without return types