randomstreamtest.cpp

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//
// RandomStreamTest.cpp
//
// $Id: //poco/Main/Foundation/testsuite/src/RandomStreamTest.cpp#5 $
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
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#include "RandomStreamTest.h"
#include "CppUnit/TestCaller.h"
#include "CppUnit/TestSuite.h"
#include "Foundation/RandomStream.h"
#include <vector>
#include <math.h>


using Foundation::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;
}