ASSERT_EQ(1, TF_OperationGetNumAttrs(oper));
  ASSERT_EQ(1, TF_OperationGetAttrNameLength(oper, 0));

  std::unique_ptr<char[]> value(new char[1]);

  TF_OperationGetAttrName(oper, 0, value.get(), s_);
  EXPECT_EQ(TF_OK, TF_GetCode(s_)) << TF_Message(s_);
  EXPECT_EQ("v", std::string(static_cast<const char*>(value.get()), 1));
}

TEST_F(CApiAttributesTest, Errors) {