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RandomStreamTest.cpp

//
// RandomStreamTest.cpp
//
// $Id: //poco/1.2/Foundation/testsuite/src/RandomStreamTest.cpp#1 $
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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//


#include "RandomStreamTest.h"
#include "CppUnit/TestCaller.h"
#include "CppUnit/TestSuite.h"
#include "Poco/RandomStream.h"
#include <vector>
#include <math.h>


using Poco::RandomInputStream;


RandomStreamTest::RandomStreamTest(const std::string& name): CppUnit::TestCase(name)
{
}


RandomStreamTest::~RandomStreamTest()
{
}


void RandomStreamTest::testStream()
{
      RandomInputStream rnd;
      
      const int n = 16;
      std::vector<int> d(n, 0);
      for (int i = 0; i < 1000; ++i)
      {
            unsigned char c;
            rnd >> c;
            d[c & 0x0F]++;
            d[(c >> 4) & 0x0F]++;
      }
      int sum = 0;
      for (int k = 0; k < n; ++k) sum += d[k];
      int avg = sum/n;
      int var = 0;
      for (int k = 0; k < n; ++k) var += (d[k] - avg)*(d[k] - avg);
      var /= n;
      int sd = int(sqrt((double) var));
      
      assert (110 < avg && avg < 140);
      assert (sd < 20);
}


void RandomStreamTest::setUp()
{
}


void RandomStreamTest::tearDown()
{
}


CppUnit::Test* RandomStreamTest::suite()
{
      CppUnit::TestSuite* pSuite = new CppUnit::TestSuite("RandomStreamTest");

      CppUnit_addTest(pSuite, RandomStreamTest, testStream);

      return pSuite;
}

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