forked from bitcoin/bitcoin
-
Notifications
You must be signed in to change notification settings - Fork 4
/
random_tests.cpp
259 lines (235 loc) · 11.1 KB
/
random_tests.cpp
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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
// Copyright (c) 2017-2022 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/random.h>
#include <test/util/setup_common.h>
#include <util/time.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_deterministic)
{
// Check that deterministic FastRandomContexts are deterministic
SeedRandomForTest(SeedRand::ZEROS);
FastRandomContext ctx1{true};
FastRandomContext ctx2{true};
{
BOOST_CHECK_EQUAL(FastRandomContext().rand<uint64_t>(), uint64_t{9330418229102544152u});
BOOST_CHECK_EQUAL(FastRandomContext().rand<int>(), int{618925161});
BOOST_CHECK_EQUAL(FastRandomContext().randrange<std::chrono::microseconds>(1h).count(), 1271170921);
BOOST_CHECK_EQUAL(FastRandomContext().randrange<std::chrono::milliseconds>(1h).count(), 2803534);
BOOST_CHECK_EQUAL(FastRandomContext().rand<uint64_t>(), uint64_t{10170981140880778086u});
BOOST_CHECK_EQUAL(FastRandomContext().rand<int>(), int{1689082725});
BOOST_CHECK_EQUAL(FastRandomContext().randrange<std::chrono::microseconds>(1h).count(), 2464643716);
BOOST_CHECK_EQUAL(FastRandomContext().randrange<std::chrono::milliseconds>(1h).count(), 2312205);
BOOST_CHECK_EQUAL(FastRandomContext().rand<uint64_t>(), uint64_t{5689404004456455543u});
BOOST_CHECK_EQUAL(FastRandomContext().rand<int>(), int{785839937});
BOOST_CHECK_EQUAL(FastRandomContext().randrange<std::chrono::microseconds>(1h).count(), 93558804);
BOOST_CHECK_EQUAL(FastRandomContext().randrange<std::chrono::milliseconds>(1h).count(), 507022);
}
{
constexpr SteadySeconds time_point{1s};
FastRandomContext ctx{true};
BOOST_CHECK_EQUAL(7, ctx.rand_uniform_delay(time_point, 9s).time_since_epoch().count());
BOOST_CHECK_EQUAL(-6, ctx.rand_uniform_delay(time_point, -9s).time_since_epoch().count());
BOOST_CHECK_EQUAL(1, ctx.rand_uniform_delay(time_point, 0s).time_since_epoch().count());
BOOST_CHECK_EQUAL(4652286523065884857, ctx.rand_uniform_delay(time_point, 9223372036854775807s).time_since_epoch().count());
BOOST_CHECK_EQUAL(-8813961240025683129, ctx.rand_uniform_delay(time_point, -9223372036854775807s).time_since_epoch().count());
BOOST_CHECK_EQUAL(26443, ctx.rand_uniform_delay(time_point, 9h).time_since_epoch().count());
}
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));
{
struct MicroClock {
using duration = std::chrono::microseconds;
};
FastRandomContext ctx{true};
// Check with clock type
BOOST_CHECK_EQUAL(47222, ctx.rand_uniform_duration<MicroClock>(1s).count());
// Check with time-point type
BOOST_CHECK_EQUAL(2782, ctx.rand_uniform_duration<SteadySeconds>(9h).count());
}
}
BOOST_AUTO_TEST_CASE(fastrandom_tests_nondeterministic)
{
// Check that a nondeterministic ones are not
{
BOOST_CHECK(FastRandomContext().rand<uint64_t>() != uint64_t{9330418229102544152u});
BOOST_CHECK(FastRandomContext().rand<int>() != int{618925161});
BOOST_CHECK(FastRandomContext().randrange<std::chrono::microseconds>(1h).count() != 1271170921);
BOOST_CHECK(FastRandomContext().randrange<std::chrono::milliseconds>(1h).count() != 2803534);
BOOST_CHECK(FastRandomContext().rand<uint64_t>() != uint64_t{10170981140880778086u});
BOOST_CHECK(FastRandomContext().rand<int>() != int{1689082725});
BOOST_CHECK(FastRandomContext().randrange<std::chrono::microseconds>(1h).count() != 2464643716);
BOOST_CHECK(FastRandomContext().randrange<std::chrono::milliseconds>(1h).count() != 2312205);
BOOST_CHECK(FastRandomContext().rand<uint64_t>() != uint64_t{5689404004456455543u});
BOOST_CHECK(FastRandomContext().rand<int>() != int{785839937});
BOOST_CHECK(FastRandomContext().randrange<std::chrono::microseconds>(1h).count() != 93558804);
BOOST_CHECK(FastRandomContext().randrange<std::chrono::milliseconds>(1h).count() != 507022);
}
{
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);
}
}
}
/** Verify that RandomMixin::randbits returns 0 and 1 for every requested bit. */
BOOST_AUTO_TEST_CASE(randbits_test)
{
FastRandomContext ctx_lens; //!< RNG for producing the lengths requested from ctx_test.
FastRandomContext ctx_test1(true), ctx_test2(true); //!< The RNGs being tested.
int ctx_test_bitsleft{0}; //!< (Assumed value of) ctx_test::bitbuf_len
// Run the entire test 5 times.
for (int i = 0; i < 5; ++i) {
// count (first) how often it has occurred, and (second) how often it was true:
// - for every bit position, in every requested bits count (0 + 1 + 2 + ... + 64 = 2080)
// - for every value of ctx_test_bitsleft (0..63 = 64)
std::vector<std::pair<uint64_t, uint64_t>> seen(2080 * 64);
while (true) {
// Loop 1000 times, just to not continuously check std::all_of.
for (int j = 0; j < 1000; ++j) {
// Decide on a number of bits to request (0 through 64, inclusive; don't use randbits/randrange).
int bits = ctx_lens.rand64() % 65;
// Generate that many bits.
uint64_t gen = ctx_test1.randbits(bits);
// For certain bits counts, also test randbits<Bits> and compare.
uint64_t gen2;
if (bits == 0) {
gen2 = ctx_test2.randbits<0>();
} else if (bits == 1) {
gen2 = ctx_test2.randbits<1>();
} else if (bits == 7) {
gen2 = ctx_test2.randbits<7>();
} else if (bits == 32) {
gen2 = ctx_test2.randbits<32>();
} else if (bits == 51) {
gen2 = ctx_test2.randbits<51>();
} else if (bits == 64) {
gen2 = ctx_test2.randbits<64>();
} else {
gen2 = ctx_test2.randbits(bits);
}
BOOST_CHECK_EQUAL(gen, gen2);
// Make sure the result is in range.
if (bits < 64) BOOST_CHECK_EQUAL(gen >> bits, 0);
// Mark all the seen bits in the output.
for (int bit = 0; bit < bits; ++bit) {
int idx = bit + (bits * (bits - 1)) / 2 + 2080 * ctx_test_bitsleft;
seen[idx].first += 1;
seen[idx].second += (gen >> bit) & 1;
}
// Update ctx_test_bitself.
if (bits > ctx_test_bitsleft) {
ctx_test_bitsleft = ctx_test_bitsleft + 64 - bits;
} else {
ctx_test_bitsleft -= bits;
}
}
// Loop until every bit position/combination is seen 242 times.
if (std::all_of(seen.begin(), seen.end(), [](const auto& x) { return x.first >= 242; })) break;
}
// Check that each bit appears within 7.78 standard deviations of 50%
// (each will fail with P < 1/(2080 * 64 * 10^9)).
for (const auto& val : seen) {
assert(fabs(val.first * 0.5 - val.second) < sqrt(val.first * 0.25) * 7.78);
}
}
}
/** Does-it-compile test for compatibility with standard library 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());
}
}
}
/** 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};
std::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_CASE(xoroshiro128plusplus_reference_values)
{
// numbers generated from reference implementation
InsecureRandomContext rng(0);
BOOST_TEST(0x6f68e1e7e2646ee1 == rng());
BOOST_TEST(0xbf971b7f454094ad == rng());
BOOST_TEST(0x48f2de556f30de38 == rng());
BOOST_TEST(0x6ea7c59f89bbfc75 == rng());
// seed with a random number
rng.Reseed(0x1a26f3fa8546b47a);
BOOST_TEST(0xc8dc5e08d844ac7d == rng());
BOOST_TEST(0x5b5f1f6d499dad1b == rng());
BOOST_TEST(0xbeb0031f93313d6f == rng());
BOOST_TEST(0xbfbcf4f43a264497 == rng());
}
BOOST_AUTO_TEST_SUITE_END()