1//
2// RandomStreamTest.cpp
3//
4// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
5// and Contributors.
6//
7// SPDX-License-Identifier: BSL-1.0
8//
9
10
11#include "RandomStreamTest.h"
12#include "Poco/CppUnit/TestCaller.h"
13#include "Poco/CppUnit/TestSuite.h"
14#include "Poco/RandomStream.h"
15#include <vector>
16#include <cmath>
17
18
19using Poco::RandomInputStream;
20
21
22RandomStreamTest::RandomStreamTest(const std::string& rName): CppUnit::TestCase(rName)
23{
24}
25
26
27RandomStreamTest::~RandomStreamTest()
28{
29}
30
31
32void RandomStreamTest::testStream()
33{
34 RandomInputStream rnd;
35
36 const int n = 16;
37 std::vector<int> d(n, 0);
38 for (int i = 0; i < 1000; ++i)
39 {
40 unsigned char c;
41 rnd >> c;
42 d[c & 0x0F]++;
43 d[(c >> 4) & 0x0F]++;
44 }
45 int sum = 0;
46 for (int k = 0; k < n; ++k) sum += d[k];
47 int avg = sum/n;
48 int var = 0;
49 for (int k = 0; k < n; ++k) var += (d[k] - avg)*(d[k] - avg);
50 var /= n;
51 int sd = int(std::sqrt((double) var));
52
53 assertTrue (110 < avg && avg < 140);
54 assertTrue (sd < 20);
55}
56
57
58void RandomStreamTest::setUp()
59{
60}
61
62
63void RandomStreamTest::tearDown()
64{
65}
66
67
68CppUnit::Test* RandomStreamTest::suite()
69{
70 CppUnit::TestSuite* pSuite = new CppUnit::TestSuite("RandomStreamTest");
71
72 CppUnit_addTest(pSuite, RandomStreamTest, testStream);
73
74 return pSuite;
75}
76