66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
#include "rand/xorshift.hpp"
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#include "rand/lcg.hpp"
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#include "rand/mwc64x.hpp"
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#include "rand/pcg.hpp"
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#include "rand/rdrand.hpp"
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#include "rand/system.hpp"
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#include "rand/xoshiro.hpp"
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#include "rand/splitmix64.hpp"
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#include "tap.hpp"
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#include "maths.hpp"
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#include "types/string.hpp"
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#include "introspection/name.hpp"
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/// //////////////////////////////////////////////////////////////////////////////
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/// Check that outputs from a UniformRandomBitGenerator are roughly divisible
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/// between a number of fixed width buckets.
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///
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/// This is not anything close to a strict statistical test. It is more aimed
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/// at link testing and basic functionality verification within a small
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/// resource footprint (ie, fast unit testing).
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template <typename GeneratorT, typename ...Args>
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static void
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test_buckets (cruft::TAP::logger &tap, Args&& ...args)
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{
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constexpr unsigned BUCKET_BITS = 8u;
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constexpr size_t BUCKET_COUNT = 1u << BUCKET_BITS;
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constexpr unsigned EXPECTED = 1024u;
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constexpr unsigned ITERATIONS = BUCKET_COUNT * EXPECTED;
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GeneratorT gen (std::forward<Args> (args)...);
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std::uniform_int_distribution<int> dist (0, BUCKET_COUNT - 1);
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unsigned buckets[BUCKET_COUNT] = {};
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for (unsigned i = 0; i < ITERATIONS; ++i)
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++buckets[dist (gen)];
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tap.expect (
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std::find_if (std::cbegin (buckets),
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std::cend (buckets),
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[] (auto v) { return v < EXPECTED * 7 / 8; }) == std::cend (buckets),
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"bucket counts for {:s}", cruft::introspection::name::full<GeneratorT> ()
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);
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}
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///////////////////////////////////////////////////////////////////////////////
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int
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main (int,char**)
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{
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cruft::TAP::logger tap;
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test_buckets<cruft::rand::splitmix64> (tap, 0x1234u);
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test_buckets<cruft::rand::xoshiro256plusplus> (tap, 0x1234u);
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test_buckets<cruft::rand::xorshift<uint32_t>> (tap, 0x1234u);
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test_buckets<cruft::rand::xorshift<uint64_t>> (tap, 0x1234u);
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test_buckets<cruft::rand::lcg_t> (tap, 0x1234u);
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test_buckets<cruft::rand::mwc64x> (tap, 0x1234u);
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test_buckets<cruft::rand::pcg_xsh_rr<>> (tap, 0x1234u);
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test_buckets<cruft::rand::system> (tap);
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test_buckets<cruft::rand::rdrand> (tap);
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return tap.status ();
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}
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