VILLASnode/common/tests/unit/buffer.cpp

/* Unit tests for buffer.
 *
 * Author: Steffen Vogel <post@steffenvogel.de>
 * SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
 * SPDX-License-Identifier: Apache-2.0
 */

#include <cstdlib>
#include <ctime>

#include <criterion/criterion.h>
#include <jansson.h>

#include <villas/buffer.hpp>

using namespace villas;

// cppcheck-suppress unknownMacro
TestSuite(buffer, .description = "Buffer datastructure");

Test(buffer, decode) {
  Buffer buf;
  json_t *j;
  json_t *k;

  const char *e = "{\"id\": \"5a786626-fbc6-4c04-98c2-48027e68c2fa\"}";
  size_t len = strlen(e);

#pragma GCC diagnostic push
// Workaround for compiler bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106199
#pragma GCC diagnostic ignored "-Wstringop-overflow"
  buf.insert(buf.begin(), e, e + len);
#pragma GCC diagnostic pop

  k = json_loads(e, 0, nullptr);
  cr_assert_not_null(k);

  j = buf.decode();
  cr_assert_not_null(j);
  cr_assert(json_equal(j, k));
}

Test(buffer, encode) {
  int ret;
  Buffer buf;
  json_t *k;

  const char *e = "{\"id\": \"5a786626-fbc6-4c04-98c2-48027e68c2fa\"}";

  k = json_loads(e, 0, nullptr);
  cr_assert_not_null(k);

  ret = buf.encode(k);
  cr_assert_eq(ret, 0);

  char *f = buf.data();
  cr_assert_not_null(f);

  cr_assert_str_eq(e, f);

  json_decref(k);
}

Test(buffer, encode_decode) {
  int ret;
  Buffer buf;
  json_t *k;
  json_t *j;

  const char *e = "{\"id\": \"5a786626-fbc6-4c04-98c2-48027e68c2fa\"}";

  k = json_loads(e, 0, nullptr);
  cr_assert_not_null(k);

  ret = buf.encode(k);
  cr_assert_eq(ret, 0);

  j = buf.decode();
  cr_assert_not_null(j);

  cr_assert(json_equal(j, k));

  json_decref(j);
  json_decref(k);
}

Test(buffer, multiple) {
  int ret;
  const int N = 100;

  Buffer buf;
  json_t *k[N];
  json_t *j[N];

  std::srand(std::time(nullptr));

  for (int i = 0; i < N; i++) {
    k[i] = json_pack("{ s: i }", "id", std::rand());
    cr_assert_not_null(k[i]);

    ret = buf.encode(k[i]);
    cr_assert_eq(ret, 0);
  }

  for (int i = 0; i < N; i++) {
    j[i] = buf.decode();
    cr_assert_not_null(j[i]);

    cr_assert(json_equal(k[i], j[i]));

    json_decref(k[i]);
    json_decref(j[i]);
  }
}