aria2/test/SimpleRandomizerTest.cc

/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2022 Tatsuhiro Tsujikawa
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so.  If you
 * do not wish to do so, delete this exception statement from your
 * version.  If you delete this exception statement from all source
 * files in the program, then also delete it here.
 */
/* copyright --> */
#include "SimpleRandomizer.h"

#include <set>
#include <array>

#include <cppunit/extensions/HelperMacros.h>

namespace aria2 {

class SimpleRandomizerTest : public CppUnit::TestFixture {
  CPPUNIT_TEST_SUITE(SimpleRandomizerTest);
  CPPUNIT_TEST(testGetRandomBytes);
  CPPUNIT_TEST_SUITE_END();

public:
  void testGetRandomBytes();
};

CPPUNIT_TEST_SUITE_REGISTRATION(SimpleRandomizerTest);

void SimpleRandomizerTest::testGetRandomBytes()
{
  std::set<std::string> set;

  constexpr size_t n = 5000;

  for (size_t i = 0; i < 5000; ++i) {
    std::array<unsigned char, 257> buf;
    SimpleRandomizer::getInstance()->getRandomBytes(buf.data(), buf.size());
    set.emplace(std::begin(buf), std::end(buf));
  }

  CPPUNIT_ASSERT_EQUAL(n, set.size());
}

} // namespace aria2