diff options
Diffstat (limited to 'src/test/random_tests.cpp')
| -rw-r--r-- | src/test/random_tests.cpp | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/src/test/random_tests.cpp b/src/test/random_tests.cpp index d2c46c0daa..8596734226 100644 --- a/src/test/random_tests.cpp +++ b/src/test/random_tests.cpp @@ -15,5 +15,39 @@ BOOST_AUTO_TEST_CASE(osrandom_tests) BOOST_CHECK(Random_SanityCheck()); } -BOOST_AUTO_TEST_SUITE_END() +BOOST_AUTO_TEST_CASE(fastrandom_tests) +{ + // Check that deterministic FastRandomContexts are deterministic + FastRandomContext ctx1(true); + FastRandomContext ctx2(true); + + 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_EQUAL(ctx1.randbits(7), ctx2.randbits(7)); + BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32()); + BOOST_CHECK_EQUAL(ctx1.randbits(3), ctx2.randbits(3)); + + // Check that a nondeterministic ones are not + FastRandomContext ctx3; + FastRandomContext ctx4; + BOOST_CHECK(ctx3.rand64() != ctx4.rand64()); // extremely unlikely to be equal +} +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, 0); + uint64_t range = ((uint64_t)1) << bits | rangebits; + uint64_t rand = ctx2.randrange(range); + BOOST_CHECK(rand < range); + } + } +} + +BOOST_AUTO_TEST_SUITE_END() |