aboutsummaryrefslogtreecommitdiff
path: root/src/test/wallet_tests.cpp
blob: a14f6b2b7056c7e4c582651bf973b90ae84bbc54 (plain)
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
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
#include <boost/test/unit_test.hpp>

#include "main.h"
#include "wallet.h"

// how many times to run all the tests to have a chance to catch errors that only show up with particular random shuffles
#define RUN_TESTS 100

// some tests fail 1% of the time due to bad luck.
// we repeat those tests this many times and only complain if all iterations of the test fail
#define RANDOM_REPEATS 5

using namespace std;

typedef set<pair<const CWalletTx*,unsigned int> > CoinSet;

BOOST_AUTO_TEST_SUITE(wallet_tests)

static CWallet wallet;
static vector<COutput> vCoins;

static void add_coin(int64 nValue, int nAge = 6*24, bool fIsFromMe = false, int nInput=0)
{
    static int nextLockTime = 0;
    CTransaction tx;
    tx.nLockTime = nextLockTime++;        // so all transactions get different hashes
    tx.vout.resize(nInput+1);
    tx.vout[nInput].nValue = nValue;
    CWalletTx* wtx = new CWalletTx(&wallet, tx);
    if (fIsFromMe)
    {
        // IsFromMe() returns (GetDebit() > 0), and GetDebit() is 0 if vin.empty(),
        // so stop vin being empty, and cache a non-zero Debit to fake out IsFromMe()
        wtx->vin.resize(1);
        wtx->fDebitCached = true;
        wtx->nDebitCached = 1;
    }
    COutput output(wtx, nInput, nAge);
    vCoins.push_back(output);
}

static void empty_wallet(void)
{
    BOOST_FOREACH(COutput output, vCoins)
        delete output.tx;
    vCoins.clear();
}

static bool equal_sets(CoinSet a, CoinSet b)
{
    pair<CoinSet::iterator, CoinSet::iterator> ret = mismatch(a.begin(), a.end(), b.begin());
    return ret.first == a.end() && ret.second == b.end();
}

BOOST_AUTO_TEST_CASE(coin_selection_tests)
{
    CoinSet setCoinsRet, setCoinsRet2;
    int64 nValueRet;

    // test multiple times to allow for differences in the shuffle order
    for (int i = 0; i < RUN_TESTS; i++)
    {
        empty_wallet();

        // with an empty wallet we can't even pay one cent
        BOOST_CHECK(!wallet.SelectCoinsMinConf( 1 * CENT, 1, 6, vCoins, setCoinsRet, nValueRet));

        add_coin(1*CENT, 4);        // add a new 1 cent coin

        // with a new 1 cent coin, we still can't find a mature 1 cent
        BOOST_CHECK(!wallet.SelectCoinsMinConf( 1 * CENT, 1, 6, vCoins, setCoinsRet, nValueRet));

        // but we can find a new 1 cent
        BOOST_CHECK( wallet.SelectCoinsMinConf( 1 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 1 * CENT);

        add_coin(2*CENT);           // add a mature 2 cent coin

        // we can't make 3 cents of mature coins
        BOOST_CHECK(!wallet.SelectCoinsMinConf( 3 * CENT, 1, 6, vCoins, setCoinsRet, nValueRet));

        // we can make 3 cents of new  coins
        BOOST_CHECK( wallet.SelectCoinsMinConf( 3 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 3 * CENT);

        add_coin(5*CENT);           // add a mature 5 cent coin,
        add_coin(10*CENT, 3, true); // a new 10 cent coin sent from one of our own addresses
        add_coin(20*CENT);          // and a mature 20 cent coin

        // now we have new: 1+10=11 (of which 10 was self-sent), and mature: 2+5+20=27.  total = 38

        // we can't make 38 cents only if we disallow new coins:
        BOOST_CHECK(!wallet.SelectCoinsMinConf(38 * CENT, 1, 6, vCoins, setCoinsRet, nValueRet));
        // we can't even make 37 cents if we don't allow new coins even if they're from us
        BOOST_CHECK(!wallet.SelectCoinsMinConf(38 * CENT, 6, 6, vCoins, setCoinsRet, nValueRet));
        // but we can make 37 cents if we accept new coins from ourself
        BOOST_CHECK( wallet.SelectCoinsMinConf(37 * CENT, 1, 6, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 37 * CENT);
        // and we can make 38 cents if we accept all new coins
        BOOST_CHECK( wallet.SelectCoinsMinConf(38 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 38 * CENT);

        // try making 34 cents from 1,2,5,10,20 - we can't do it exactly
        BOOST_CHECK( wallet.SelectCoinsMinConf(34 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_GT(nValueRet, 34 * CENT);         // but should get more than 34 cents
        BOOST_CHECK_EQUAL(setCoinsRet.size(), 3U);     // the best should be 20+10+5.  it's incredibly unlikely the 1 or 2 got included (but possible)

        // when we try making 7 cents, the smaller coins (1,2,5) are enough.  We should see just 2+5
        BOOST_CHECK( wallet.SelectCoinsMinConf( 7 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 7 * CENT);
        BOOST_CHECK_EQUAL(setCoinsRet.size(), 2U);

        // when we try making 8 cents, the smaller coins (1,2,5) are exactly enough.
        BOOST_CHECK( wallet.SelectCoinsMinConf( 8 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK(nValueRet == 8 * CENT);
        BOOST_CHECK_EQUAL(setCoinsRet.size(), 3U);

        // when we try making 9 cents, no subset of smaller coins is enough, and we get the next bigger coin (10)
        BOOST_CHECK( wallet.SelectCoinsMinConf( 9 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 10 * CENT);
        BOOST_CHECK_EQUAL(setCoinsRet.size(), 1U);

        // now clear out the wallet and start again to test choosing between subsets of smaller coins and the next biggest coin
        empty_wallet();

        add_coin( 6*CENT);
        add_coin( 7*CENT);
        add_coin( 8*CENT);
        add_coin(20*CENT);
        add_coin(30*CENT); // now we have 6+7+8+20+30 = 71 cents total

        // check that we have 71 and not 72
        BOOST_CHECK( wallet.SelectCoinsMinConf(71 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK(!wallet.SelectCoinsMinConf(72 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));

        // now try making 16 cents.  the best smaller coins can do is 6+7+8 = 21; not as good at the next biggest coin, 20
        BOOST_CHECK( wallet.SelectCoinsMinConf(16 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 20 * CENT); // we should get 20 in one coin
        BOOST_CHECK_EQUAL(setCoinsRet.size(), 1U);

        add_coin( 5*CENT); // now we have 5+6+7+8+20+30 = 75 cents total

        // now if we try making 16 cents again, the smaller coins can make 5+6+7 = 18 cents, better than the next biggest coin, 20
        BOOST_CHECK( wallet.SelectCoinsMinConf(16 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 18 * CENT); // we should get 18 in 3 coins
        BOOST_CHECK_EQUAL(setCoinsRet.size(), 3U);

        add_coin( 18*CENT); // now we have 5+6+7+8+18+20+30

        // and now if we try making 16 cents again, the smaller coins can make 5+6+7 = 18 cents, the same as the next biggest coin, 18
        BOOST_CHECK( wallet.SelectCoinsMinConf(16 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 18 * CENT);  // we should get 18 in 1 coin
        BOOST_CHECK_EQUAL(setCoinsRet.size(), 1U); // because in the event of a tie, the biggest coin wins

        // now try making 11 cents.  we should get 5+6
        BOOST_CHECK( wallet.SelectCoinsMinConf(11 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 11 * CENT);
        BOOST_CHECK_EQUAL(setCoinsRet.size(), 2U);

        // check that the smallest bigger coin is used
        add_coin( 1*COIN);
        add_coin( 2*COIN);
        add_coin( 3*COIN);
        add_coin( 4*COIN); // now we have 5+6+7+8+18+20+30+100+200+300+400 = 1094 cents
        BOOST_CHECK( wallet.SelectCoinsMinConf(95 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 1 * COIN);  // we should get 1 BTC in 1 coin
        BOOST_CHECK_EQUAL(setCoinsRet.size(), 1U);

        BOOST_CHECK( wallet.SelectCoinsMinConf(195 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 2 * COIN);  // we should get 2 BTC in 1 coin
        BOOST_CHECK_EQUAL(setCoinsRet.size(), 1U);

        // empty the wallet and start again, now with fractions of a cent, to test sub-cent change avoidance
        empty_wallet();
        add_coin(0.1*CENT);
        add_coin(0.2*CENT);
        add_coin(0.3*CENT);
        add_coin(0.4*CENT);
        add_coin(0.5*CENT);

        // try making 1 cent from 0.1 + 0.2 + 0.3 + 0.4 + 0.5 = 1.5 cents
        // we'll get sub-cent change whatever happens, so can expect 1.0 exactly
        BOOST_CHECK( wallet.SelectCoinsMinConf(1 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 1 * CENT);

        // but if we add a bigger coin, making it possible to avoid sub-cent change, things change:
        add_coin(1111*CENT);

        // try making 1 cent from 0.1 + 0.2 + 0.3 + 0.4 + 0.5 + 1111 = 1112.5 cents
        BOOST_CHECK( wallet.SelectCoinsMinConf(1 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 1 * CENT); // we should get the exact amount

        // if we add more sub-cent coins:
        add_coin(0.6*CENT);
        add_coin(0.7*CENT);

        // and try again to make 1.0 cents, we can still make 1.0 cents
        BOOST_CHECK( wallet.SelectCoinsMinConf(1 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 1 * CENT); // we should get the exact amount

        // run the 'mtgox' test (see http://blockexplorer.com/tx/29a3efd3ef04f9153d47a990bd7b048a4b2d213daaa5fb8ed670fb85f13bdbcf)
        // they tried to consolidate 10 50k coins into one 500k coin, and ended up with 50k in change
        empty_wallet();
        for (int i = 0; i < 20; i++)
            add_coin(50000 * COIN);

        BOOST_CHECK( wallet.SelectCoinsMinConf(500000 * COIN, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 500000 * COIN); // we should get the exact amount
        BOOST_CHECK_EQUAL(setCoinsRet.size(), 10U); // in ten coins

        // if there's not enough in the smaller coins to make at least 1 cent change (0.5+0.6+0.7 < 1.0+1.0),
        // we need to try finding an exact subset anyway

        // sometimes it will fail, and so we use the next biggest coin:
        empty_wallet();
        add_coin(0.5 * CENT);
        add_coin(0.6 * CENT);
        add_coin(0.7 * CENT);
        add_coin(1111 * CENT);
        BOOST_CHECK( wallet.SelectCoinsMinConf(1 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 1111 * CENT); // we get the bigger coin
        BOOST_CHECK_EQUAL(setCoinsRet.size(), 1U);

        // but sometimes it's possible, and we use an exact subset (0.4 + 0.6 = 1.0)
        empty_wallet();
        add_coin(0.4 * CENT);
        add_coin(0.6 * CENT);
        add_coin(0.8 * CENT);
        add_coin(1111 * CENT);
        BOOST_CHECK( wallet.SelectCoinsMinConf(1 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 1 * CENT);   // we should get the exact amount
        BOOST_CHECK_EQUAL(setCoinsRet.size(), 2U); // in two coins 0.4+0.6

        // test avoiding sub-cent change
        empty_wallet();
        add_coin(0.0005 * COIN);
        add_coin(0.01 * COIN);
        add_coin(1 * COIN);

        // trying to make 1.0001 from these three coins
        BOOST_CHECK( wallet.SelectCoinsMinConf(1.0001 * COIN, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 1.0105 * COIN);   // we should get all coins
        BOOST_CHECK_EQUAL(setCoinsRet.size(), 3U);

        // but if we try to make 0.999, we should take the bigger of the two small coins to avoid sub-cent change
        BOOST_CHECK( wallet.SelectCoinsMinConf(0.999 * COIN, 1, 1, vCoins, setCoinsRet, nValueRet));
        BOOST_CHECK_EQUAL(nValueRet, 1.01 * COIN);   // we should get 1 + 0.01
        BOOST_CHECK_EQUAL(setCoinsRet.size(), 2U);

        // test randomness
        {
            empty_wallet();
            for (int i2 = 0; i2 < 100; i2++)
                add_coin(COIN);

            // picking 50 from 100 coins doesn't depend on the shuffle,
            // but does depend on randomness in the stochastic approximation code
            BOOST_CHECK(wallet.SelectCoinsMinConf(50 * COIN, 1, 6, vCoins, setCoinsRet , nValueRet));
            BOOST_CHECK(wallet.SelectCoinsMinConf(50 * COIN, 1, 6, vCoins, setCoinsRet2, nValueRet));
            BOOST_CHECK(!equal_sets(setCoinsRet, setCoinsRet2));

            int fails = 0;
            for (int i = 0; i < RANDOM_REPEATS; i++)
            {
                // selecting 1 from 100 identical coins depends on the shuffle; this test will fail 1% of the time
                // run the test RANDOM_REPEATS times and only complain if all of them fail
                BOOST_CHECK(wallet.SelectCoinsMinConf(COIN, 1, 6, vCoins, setCoinsRet , nValueRet));
                BOOST_CHECK(wallet.SelectCoinsMinConf(COIN, 1, 6, vCoins, setCoinsRet2, nValueRet));
                if (equal_sets(setCoinsRet, setCoinsRet2))
                    fails++;
            }
            BOOST_CHECK_NE(fails, RANDOM_REPEATS);

            // add 75 cents in small change.  not enough to make 90 cents,
            // then try making 90 cents.  there are multiple competing "smallest bigger" coins,
            // one of which should be picked at random
            add_coin( 5*CENT); add_coin(10*CENT); add_coin(15*CENT); add_coin(20*CENT); add_coin(25*CENT);

            fails = 0;
            for (int i = 0; i < RANDOM_REPEATS; i++)
            {
                // selecting 1 from 100 identical coins depends on the shuffle; this test will fail 1% of the time
                // run the test RANDOM_REPEATS times and only complain if all of them fail
                BOOST_CHECK(wallet.SelectCoinsMinConf(90*CENT, 1, 6, vCoins, setCoinsRet , nValueRet));
                BOOST_CHECK(wallet.SelectCoinsMinConf(90*CENT, 1, 6, vCoins, setCoinsRet2, nValueRet));
                if (equal_sets(setCoinsRet, setCoinsRet2))
                    fails++;
            }
            BOOST_CHECK_NE(fails, RANDOM_REPEATS);
        }
    }
}

BOOST_AUTO_TEST_SUITE_END()