code: def test_edge_cases(self):
      self.assertAlmostEqual(tc.distances.euclidean({}, {}), 0.0)
      self.assertAlmostEqual(
          tc.distances.euclidean({}, {"a": 1.0}), 1.0
      )
      self.assertAlmostEqual(tc.distances.jaccard({}, {}), 0.0)
  
      dists = [
          "euclidean",
          "squared_euclidean",
          "manhattan",
          "cosine",
          "jaccard",
          "weighted_jaccard",
          "levenshtein",
      ]
  
      for d in dists:
          dist_fn = tc.distances.__dict__[d]
  
          with self.assertRaises(ToolkitError):
              dist_fn([1.0], {"a": 1.0})
  
          with self.assertRaises(ToolkitError):
              dist_fn(5.0, 7.0)
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import copy
  import unittest
  import numpy
  import turicreate
  from turicreate.toolkits._main import ToolkitError
  from collections import Counter
  import sys
label_desc: Use image node_id 9 for calling the StandardDistancesTest obj's underlying member method code with example usage: obj.test_edge_cases() without return types