code: def testDictTypeSubtype(self):
      dict_type = default_types.Dict
      dict_a = dict_type(
          {
              "a": Mock2AsTopType(1),
              "b": Mock2AsTopType(1),
              "c": Mock2AsTopType(1),
          }
      )
      dict_b = dict_type(
          {
              "a": Mock2AsTopType(2),
              "b": Mock2AsTopType(2),
              "c": Mock2AsTopType(2),
          }
      )
      dict_c = dict_type(
          {"a": Mock2AsTopType(1), "b": Mock2AsTopType(1)}
      )
  
      self.assertTrue(dict_a.is_subtype_of(dict_b))
      self.assertFalse(dict_c.is_subtype_of(dict_b))
      self.assertFalse(dict_c.is_subtype_of(dict_a))
  
imports: import collections
  from tensorflow.core.function.trace_type import default_types
  from tensorflow.core.function.trace_type import serialization
  from tensorflow.python.platform import test
  from tensorflow.python.types import trace
label_desc: Use image node_id 10 for calling the DefaultTypesTest obj's underlying member method code with example usage: obj.testDictTypeSubtype() without return types