// check op and versioning.
  EXPECT_THAT(model_.operator_codes, SizeIs(2));
  EXPECT_THAT(GetBuiltinCode(model_.operator_codes[0].get()),
              Eq(BuiltinOperator_ADD));
  ASSERT_THAT(model_.operator_codes[0]->version, Eq(2));
  EXPECT_THAT(GetBuiltinCode(model_.operator_codes[1].get()),
              Eq(BuiltinOperator_RESHAPE));
  ASSERT_THAT(model_.operator_codes[1]->version, Eq(1));
}