std::mt19937 gen(rd());
    std::uniform_int_distribution<> distribution;
    rng_val_ = distribution(gen);
  }

  static void SetCloudPath(const std::string& cloud_path) {
    cloud_path_ = cloud_path;
    if (cloud_path_.back() == '/') cloud_path_.pop_back();
  }

  static void SetTmpDir(const std::string& tmp_dir) {
    tmp_dir_ = tmp_dir.empty() ? ::testing::TempDir() : tmp_dir;
  }

 protected:

  CHECK_EQ(TF_OK, TF_GetCode(status)) << TF_Message(status);
  TFE_Op* cloned = CloneOp(original_var_op);

  EXPECT_EQ("/job:localhost/replica:0/task:0/device:CPU:0",
            std::string(TFE_OpGetDevice(cloned, status)));
  CHECK_EQ(TF_OK, TF_GetCode(status)) << TF_Message(status);
  EXPECT_EQ("VarHandleOp", std::string(TFE_OpGetName(cloned, status)));
  CHECK_EQ(TF_OK, TF_GetCode(status)) << TF_Message(status);