83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
// Copyright (c) 2017 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <random.h>
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#include <test/test_bitcoin.h>
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#include <boost/test/unit_test.hpp>
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#include <random>
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#include <algorithm>
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BOOST_FIXTURE_TEST_SUITE(random_tests, BasicTestingSetup)
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BOOST_AUTO_TEST_CASE(osrandom_tests)
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{
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BOOST_CHECK(Random_SanityCheck());
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}
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BOOST_AUTO_TEST_CASE(fastrandom_tests)
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{
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// Check that deterministic FastRandomContexts are deterministic
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FastRandomContext ctx1(true);
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FastRandomContext ctx2(true);
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BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32());
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BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32());
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BOOST_CHECK_EQUAL(ctx1.rand64(), ctx2.rand64());
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BOOST_CHECK_EQUAL(ctx1.randbits(3), ctx2.randbits(3));
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BOOST_CHECK(ctx1.randbytes(17) == ctx2.randbytes(17));
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BOOST_CHECK(ctx1.rand256() == ctx2.rand256());
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BOOST_CHECK_EQUAL(ctx1.randbits(7), ctx2.randbits(7));
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BOOST_CHECK(ctx1.randbytes(128) == ctx2.randbytes(128));
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BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32());
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BOOST_CHECK_EQUAL(ctx1.randbits(3), ctx2.randbits(3));
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BOOST_CHECK(ctx1.rand256() == ctx2.rand256());
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BOOST_CHECK(ctx1.randbytes(50) == ctx2.randbytes(50));
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// Check that a nondeterministic ones are not
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FastRandomContext ctx3;
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FastRandomContext ctx4;
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BOOST_CHECK(ctx3.rand64() != ctx4.rand64()); // extremely unlikely to be equal
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BOOST_CHECK(ctx3.rand256() != ctx4.rand256());
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BOOST_CHECK(ctx3.randbytes(7) != ctx4.randbytes(7));
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}
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BOOST_AUTO_TEST_CASE(fastrandom_randbits)
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{
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FastRandomContext ctx1;
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FastRandomContext ctx2;
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for (int bits = 0; bits < 63; ++bits) {
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for (int j = 0; j < 1000; ++j) {
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uint64_t rangebits = ctx1.randbits(bits);
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BOOST_CHECK_EQUAL(rangebits >> bits, 0U);
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uint64_t range = ((uint64_t)1) << bits | rangebits;
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uint64_t rand = ctx2.randrange(range);
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BOOST_CHECK(rand < range);
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}
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}
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}
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/** Does-it-compile test for compatibility with standard C++11 RNG interface. */
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BOOST_AUTO_TEST_CASE(stdrandom_test)
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{
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FastRandomContext ctx;
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std::uniform_int_distribution<int> distribution(3, 9);
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for (int i = 0; i < 100; ++i) {
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int x = distribution(ctx);
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BOOST_CHECK(x >= 3);
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BOOST_CHECK(x <= 9);
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std::vector<int> test{1,2,3,4,5,6,7,8,9,10};
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std::shuffle(test.begin(), test.end(), ctx);
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for (int j = 1; j <= 10; ++j) {
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BOOST_CHECK(std::find(test.begin(), test.end(), j) != test.end());
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}
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}
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}
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BOOST_AUTO_TEST_SUITE_END()
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