code: def test_dict(self):
      source = "c = {a:b}"
      self.assertDepends(
          source, {("c", "a"), ("c", "b")}, {"a", "b"}, {"c"}
      )
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import ast
  from ...asttools.visitors.graph_visitor import GraphGen
  from ...asttools.visitors.graph_visitor import DiGraph
  from ...asttools.tests import AllTypesTested, skip_networkx
label_desc: Use image node_id 21 for calling the Test obj's underlying member method code with example usage: obj.test_dict() without return types