docstr: Test rank returns expected value for distinct and identical nodes.
docstr_tok: ["Test","rank","returns","expected","value","for","distinct","and","identical","nodes","."]
code: def test_rank(self):
      """Test rank returns expected value for distinct and identical nodes."""
      self.assertEqual(self.vectors.rank("war", "war"), 1)
      self.assertEqual(self.vectors.rank("war", "terrorism"), 3)
  
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 20 for calling the TestKeyedVectors obj's underlying member method code with example usage: obj.test_rank() without return types