randomtest.cpp

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//
// RandomTest.cpp
//
// $Id: //poco/Main/Foundation/testsuite/src/RandomTest.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
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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#include "RandomTest.h"
#include "CppUnit/TestCaller.h"
#include "CppUnit/TestSuite.h"
#include "Foundation/Random.h"
#include <vector>
#include <math.h>


using Foundation::Random;
using Foundation::UInt32;


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


RandomTest::~RandomTest()
{
}


void RandomTest::testSequence1()
{
	Random rnd1;
	Random rnd2;
	rnd1.seed(12345);
	rnd2.seed(12345);
	for (int i = 0; i < 100; ++i)
	{
		assert (rnd1.next() == rnd2.next());
	}
}


void RandomTest::testSequence2()
{
	Random rnd1;
	Random rnd2;
	rnd1.seed(12345);
	rnd2.seed(54321);
	
	bool equals = true;	
	for (int i = 0; i < 20; ++i)
	{
		if (rnd1.next() != rnd2.next())
		{
			equals = false;
			break;
		}
	}
	assert (!equals);
}


void RandomTest::testDistribution1()
{
	Random rnd;
	rnd.seed(123456);
	const int n = 11;
	int d[n] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
	for (int i = 0; i < 100; ++i)
	{
		d[rnd.next() % n] = 1;
	}
	int sum = 0;
	for (int k = 0; k < n; ++k) sum += d[k];
	
	assert (sum == n);
}


void RandomTest::testDistribution2()
{
	Random rnd;
	rnd.seed();
	const int n = 101;
	std::vector<int> d(n, 0);
	for (int i = 0; i < 10000; ++i)
	{
		d[rnd.next(n)]++;
	}
	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 (95 < avg && avg < 105);
	assert (sd < 15);
}


void RandomTest::testDistribution3()
{
	Random rnd;
	rnd.seed();
	const int n = 101;
	std::vector<int> d(n, 0);
	for (int i = 0; i < 10000; ++i)
	{
		d[int(rnd.nextFloat()*n)]++;
	}
	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 (95 < avg && avg < 105);
	assert (sd < 15);
}


void RandomTest::setUp()
{
}


void RandomTest::tearDown()
{
}


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

	CppUnit_addTest(pSuite, RandomTest, testSequence1);
	CppUnit_addTest(pSuite, RandomTest, testSequence2);
	CppUnit_addTest(pSuite, RandomTest, testDistribution1);
	CppUnit_addTest(pSuite, RandomTest, testDistribution2);
	CppUnit_addTest(pSuite, RandomTest, testDistribution3);

	return pSuite;
}