Line data Source code
1 : // Copyright (c) 2017-2020 The Bitcoin Core developers
2 : // Distributed under the MIT software license, see the accompanying
3 : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 :
5 : #include <random.h>
6 :
7 : #include <test/util/setup_common.h>
8 : #include <util/time.h>
9 :
10 : #include <boost/test/unit_test.hpp>
11 :
12 : #include <algorithm>
13 :
14 146 : BOOST_FIXTURE_TEST_SUITE(random_tests, BasicTestingSetup)
15 :
16 149 : BOOST_AUTO_TEST_CASE(osrandom_tests)
17 : {
18 1 : BOOST_CHECK(Random_SanityCheck());
19 1 : }
20 :
21 149 : BOOST_AUTO_TEST_CASE(fastrandom_tests)
22 : {
23 : // Check that deterministic FastRandomContexts are deterministic
24 1 : g_mock_deterministic_tests = true;
25 1 : FastRandomContext ctx1(true);
26 1 : FastRandomContext ctx2(true);
27 :
28 11 : for (int i = 10; i > 0; --i) {
29 10 : BOOST_CHECK_EQUAL(GetRand<uint64_t>(), uint64_t{10393729187455219830U});
30 10 : BOOST_CHECK_EQUAL(GetRand<int>(), int{769702006});
31 10 : BOOST_CHECK_EQUAL(GetRandMicros(std::chrono::hours{1}).count(), 2917185654);
32 10 : BOOST_CHECK_EQUAL(GetRandMillis(std::chrono::hours{1}).count(), 2144374);
33 10 : }
34 : {
35 1 : constexpr SteadySeconds time_point{1s};
36 1 : FastRandomContext ctx{true};
37 1 : BOOST_CHECK_EQUAL(7, ctx.rand_uniform_delay(time_point, 9s).time_since_epoch().count());
38 1 : BOOST_CHECK_EQUAL(-6, ctx.rand_uniform_delay(time_point, -9s).time_since_epoch().count());
39 1 : BOOST_CHECK_EQUAL(1, ctx.rand_uniform_delay(time_point, 0s).time_since_epoch().count());
40 1 : BOOST_CHECK_EQUAL(1467825113502396065, ctx.rand_uniform_delay(time_point, 9223372036854775807s).time_since_epoch().count());
41 1 : BOOST_CHECK_EQUAL(-970181367944767837, ctx.rand_uniform_delay(time_point, -9223372036854775807s).time_since_epoch().count());
42 1 : BOOST_CHECK_EQUAL(24761, ctx.rand_uniform_delay(time_point, 9h).time_since_epoch().count());
43 1 : }
44 1 : BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32());
45 1 : BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32());
46 1 : BOOST_CHECK_EQUAL(ctx1.rand64(), ctx2.rand64());
47 1 : BOOST_CHECK_EQUAL(ctx1.randbits(3), ctx2.randbits(3));
48 1 : BOOST_CHECK(ctx1.randbytes(17) == ctx2.randbytes(17));
49 1 : BOOST_CHECK(ctx1.rand256() == ctx2.rand256());
50 1 : BOOST_CHECK_EQUAL(ctx1.randbits(7), ctx2.randbits(7));
51 1 : BOOST_CHECK(ctx1.randbytes(128) == ctx2.randbytes(128));
52 1 : BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32());
53 1 : BOOST_CHECK_EQUAL(ctx1.randbits(3), ctx2.randbits(3));
54 1 : BOOST_CHECK(ctx1.rand256() == ctx2.rand256());
55 1 : BOOST_CHECK(ctx1.randbytes(50) == ctx2.randbytes(50));
56 : {
57 : struct MicroClock {
58 : using duration = std::chrono::microseconds;
59 : };
60 1 : FastRandomContext ctx{true};
61 : // Check with clock type
62 1 : BOOST_CHECK_EQUAL(47222, ctx.rand_uniform_duration<MicroClock>(1s).count());
63 : // Check with time-point type
64 1 : BOOST_CHECK_EQUAL(2782, ctx.rand_uniform_duration<SteadySeconds>(9h).count());
65 1 : }
66 :
67 : // Check that a nondeterministic ones are not
68 1 : g_mock_deterministic_tests = false;
69 11 : for (int i = 10; i > 0; --i) {
70 10 : BOOST_CHECK(GetRand<uint64_t>() != uint64_t{10393729187455219830U});
71 10 : BOOST_CHECK(GetRand<int>() != int{769702006});
72 10 : BOOST_CHECK(GetRandMicros(std::chrono::hours{1}) != std::chrono::microseconds{2917185654});
73 10 : BOOST_CHECK(GetRandMillis(std::chrono::hours{1}) != std::chrono::milliseconds{2144374});
74 10 : }
75 :
76 : {
77 1 : FastRandomContext ctx3, ctx4;
78 1 : BOOST_CHECK(ctx3.rand64() != ctx4.rand64()); // extremely unlikely to be equal
79 1 : }
80 : {
81 1 : FastRandomContext ctx3, ctx4;
82 1 : BOOST_CHECK(ctx3.rand256() != ctx4.rand256());
83 1 : }
84 : {
85 1 : FastRandomContext ctx3, ctx4;
86 1 : BOOST_CHECK(ctx3.randbytes(7) != ctx4.randbytes(7));
87 1 : }
88 1 : }
89 :
90 149 : BOOST_AUTO_TEST_CASE(fastrandom_randbits)
91 : {
92 1 : FastRandomContext ctx1;
93 1 : FastRandomContext ctx2;
94 64 : for (int bits = 0; bits < 63; ++bits) {
95 63063 : for (int j = 0; j < 1000; ++j) {
96 63000 : uint64_t rangebits = ctx1.randbits(bits);
97 63000 : BOOST_CHECK_EQUAL(rangebits >> bits, 0U);
98 63000 : uint64_t range = (uint64_t{1}) << bits | rangebits;
99 63000 : uint64_t rand = ctx2.randrange(range);
100 63000 : BOOST_CHECK(rand < range);
101 63000 : }
102 63 : }
103 1 : }
104 :
105 : /** Does-it-compile test for compatibility with standard library RNG interface. */
106 149 : BOOST_AUTO_TEST_CASE(stdrandom_test)
107 : {
108 1 : FastRandomContext ctx;
109 1 : std::uniform_int_distribution<int> distribution(3, 9);
110 101 : for (int i = 0; i < 100; ++i) {
111 100 : int x = distribution(ctx);
112 100 : BOOST_CHECK(x >= 3);
113 100 : BOOST_CHECK(x <= 9);
114 :
115 100 : std::vector<int> test{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
116 100 : std::shuffle(test.begin(), test.end(), ctx);
117 1100 : for (int j = 1; j <= 10; ++j) {
118 1000 : BOOST_CHECK(std::find(test.begin(), test.end(), j) != test.end());
119 1000 : }
120 100 : Shuffle(test.begin(), test.end(), ctx);
121 1100 : for (int j = 1; j <= 10; ++j) {
122 1000 : BOOST_CHECK(std::find(test.begin(), test.end(), j) != test.end());
123 1000 : }
124 100 : }
125 1 : }
126 :
127 : /** Test that Shuffle reaches every permutation with equal probability. */
128 149 : BOOST_AUTO_TEST_CASE(shuffle_stat_test)
129 : {
130 1 : FastRandomContext ctx(true);
131 1 : uint32_t counts[5 * 5 * 5 * 5 * 5] = {0};
132 12001 : for (int i = 0; i < 12000; ++i) {
133 12000 : int data[5] = {0, 1, 2, 3, 4};
134 12000 : Shuffle(std::begin(data), std::end(data), ctx);
135 12000 : int pos = data[0] + data[1] * 5 + data[2] * 25 + data[3] * 125 + data[4] * 625;
136 12000 : ++counts[pos];
137 12000 : }
138 1 : unsigned int sum = 0;
139 1 : double chi_score = 0.0;
140 3126 : for (int i = 0; i < 5 * 5 * 5 * 5 * 5; ++i) {
141 3125 : int i1 = i % 5, i2 = (i / 5) % 5, i3 = (i / 25) % 5, i4 = (i / 125) % 5, i5 = i / 625;
142 3125 : uint32_t count = counts[i];
143 3125 : if (i1 == i2 || i1 == i3 || i1 == i4 || i1 == i5 || i2 == i3 || i2 == i4 || i2 == i5 || i3 == i4 || i3 == i5 || i4 == i5) {
144 3005 : BOOST_CHECK(count == 0);
145 3005 : } else {
146 120 : chi_score += ((count - 100.0) * (count - 100.0)) / 100.0;
147 120 : BOOST_CHECK(count > 50);
148 120 : BOOST_CHECK(count < 150);
149 120 : sum += count;
150 : }
151 3125 : }
152 1 : BOOST_CHECK(chi_score > 58.1411); // 99.9999% confidence interval
153 1 : BOOST_CHECK(chi_score < 210.275);
154 1 : BOOST_CHECK_EQUAL(sum, 12000U);
155 1 : }
156 :
157 146 : BOOST_AUTO_TEST_SUITE_END()
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