1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
// Copyright (c) 2017-2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <random.h>
#include <test/util/setup_common.h>
#include <boost/test/unit_test.hpp>
#include <algorithm>
#include <random>
BOOST_FIXTURE_TEST_SUITE(random_tests, BasicTestingSetup)
BOOST_AUTO_TEST_CASE(osrandom_tests)
{
BOOST_CHECK(Random_SanityCheck());
}
BOOST_AUTO_TEST_CASE(fastrandom_tests)
{
// Check that deterministic FastRandomContexts are deterministic
g_mock_deterministic_tests = true;
FastRandomContext ctx1(true);
FastRandomContext ctx2(true);
for (int i = 10; i > 0; --i) {
BOOST_CHECK_EQUAL(GetRand(std::numeric_limits<uint64_t>::max()), uint64_t{10393729187455219830U});
BOOST_CHECK_EQUAL(GetRandInt(std::numeric_limits<int>::max()), int{769702006});
BOOST_CHECK_EQUAL(GetRandMicros(std::chrono::hours{1}).count(), 2917185654);
BOOST_CHECK_EQUAL(GetRandMillis(std::chrono::hours{1}).count(), 2144374);
}
BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32());
BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32());
BOOST_CHECK_EQUAL(ctx1.rand64(), ctx2.rand64());
BOOST_CHECK_EQUAL(ctx1.randbits(3), ctx2.randbits(3));
BOOST_CHECK(ctx1.randbytes(17) == ctx2.randbytes(17));
BOOST_CHECK(ctx1.rand256() == ctx2.rand256());
BOOST_CHECK_EQUAL(ctx1.randbits(7), ctx2.randbits(7));
BOOST_CHECK(ctx1.randbytes(128) == ctx2.randbytes(128));
BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32());
BOOST_CHECK_EQUAL(ctx1.randbits(3), ctx2.randbits(3));
BOOST_CHECK(ctx1.rand256() == ctx2.rand256());
BOOST_CHECK(ctx1.randbytes(50) == ctx2.randbytes(50));
// Check that a nondeterministic ones are not
g_mock_deterministic_tests = false;
for (int i = 10; i > 0; --i) {
BOOST_CHECK(GetRand(std::numeric_limits<uint64_t>::max()) != uint64_t{10393729187455219830U});
BOOST_CHECK(GetRandInt(std::numeric_limits<int>::max()) != int{769702006});
BOOST_CHECK(GetRandMicros(std::chrono::hours{1}) != std::chrono::microseconds{2917185654});
BOOST_CHECK(GetRandMillis(std::chrono::hours{1}) != std::chrono::milliseconds{2144374});
}
{
FastRandomContext ctx3, ctx4;
BOOST_CHECK(ctx3.rand64() != ctx4.rand64()); // extremely unlikely to be equal
}
{
FastRandomContext ctx3, ctx4;
BOOST_CHECK(ctx3.rand256() != ctx4.rand256());
}
{
FastRandomContext ctx3, ctx4;
BOOST_CHECK(ctx3.randbytes(7) != ctx4.randbytes(7));
}
}
BOOST_AUTO_TEST_CASE(fastrandom_randbits)
{
FastRandomContext ctx1;
FastRandomContext ctx2;
for (int bits = 0; bits < 63; ++bits) {
for (int j = 0; j < 1000; ++j) {
uint64_t rangebits = ctx1.randbits(bits);
BOOST_CHECK_EQUAL(rangebits >> bits, 0U);
uint64_t range = ((uint64_t)1) << bits | rangebits;
uint64_t rand = ctx2.randrange(range);
BOOST_CHECK(rand < range);
}
}
}
/** Does-it-compile test for compatibility with standard C++11 RNG interface. */
BOOST_AUTO_TEST_CASE(stdrandom_test)
{
FastRandomContext ctx;
std::uniform_int_distribution<int> distribution(3, 9);
for (int i = 0; i < 100; ++i) {
int x = distribution(ctx);
BOOST_CHECK(x >= 3);
BOOST_CHECK(x <= 9);
std::vector<int> test{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
std::shuffle(test.begin(), test.end(), ctx);
for (int j = 1; j <= 10; ++j) {
BOOST_CHECK(std::find(test.begin(), test.end(), j) != test.end());
}
Shuffle(test.begin(), test.end(), ctx);
for (int j = 1; j <= 10; ++j) {
BOOST_CHECK(std::find(test.begin(), test.end(), j) != test.end());
}
}
}
/** Test that Shuffle reaches every permutation with equal probability. */
BOOST_AUTO_TEST_CASE(shuffle_stat_test)
{
FastRandomContext ctx(true);
uint32_t counts[5 * 5 * 5 * 5 * 5] = {0};
for (int i = 0; i < 12000; ++i) {
int data[5] = {0, 1, 2, 3, 4};
Shuffle(std::begin(data), std::end(data), ctx);
int pos = data[0] + data[1] * 5 + data[2] * 25 + data[3] * 125 + data[4] * 625;
++counts[pos];
}
unsigned int sum = 0;
double chi_score = 0.0;
for (int i = 0; i < 5 * 5 * 5 * 5 * 5; ++i) {
int i1 = i % 5, i2 = (i / 5) % 5, i3 = (i / 25) % 5, i4 = (i / 125) % 5, i5 = i / 625;
uint32_t count = counts[i];
if (i1 == i2 || i1 == i3 || i1 == i4 || i1 == i5 || i2 == i3 || i2 == i4 || i2 == i5 || i3 == i4 || i3 == i5 || i4 == i5) {
BOOST_CHECK(count == 0);
} else {
chi_score += ((count - 100.0) * (count - 100.0)) / 100.0;
BOOST_CHECK(count > 50);
BOOST_CHECK(count < 150);
sum += count;
}
}
BOOST_CHECK(chi_score > 58.1411); // 99.9999% confidence interval
BOOST_CHECK(chi_score < 210.275);
BOOST_CHECK_EQUAL(sum, 12000U);
}
BOOST_AUTO_TEST_SUITE_END()
|
