590 lines
24 KiB
C++
590 lines
24 KiB
C++
|
|
// Copyright Catch2 Authors
|
|
// Distributed under the Boost Software License, Version 1.0.
|
|
// (See accompanying file LICENSE.txt or copy at
|
|
// https://www.boost.org/LICENSE_1_0.txt)
|
|
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
|
|
#include <catch2/catch_test_macros.hpp>
|
|
#include <catch2/catch_template_test_macros.hpp>
|
|
#include <catch2/internal/catch_floating_point_helpers.hpp>
|
|
#include <catch2/internal/catch_random_integer_helpers.hpp>
|
|
#include <catch2/internal/catch_random_number_generator.hpp>
|
|
#include <catch2/internal/catch_random_seed_generation.hpp>
|
|
#include <catch2/internal/catch_uniform_floating_point_distribution.hpp>
|
|
#include <catch2/internal/catch_uniform_integer_distribution.hpp>
|
|
#include <catch2/generators/catch_generators.hpp>
|
|
#include <catch2/matchers/catch_matchers_range_equals.hpp>
|
|
|
|
#include <random>
|
|
|
|
TEST_CASE("Our PCG implementation provides expected results for known seeds", "[rng]") {
|
|
Catch::SimplePcg32 rng;
|
|
SECTION("Default seeded") {
|
|
REQUIRE(rng() == 0xfcdb943b);
|
|
REQUIRE(rng() == 0x6f55b921);
|
|
REQUIRE(rng() == 0x4c17a916);
|
|
REQUIRE(rng() == 0x71eae25f);
|
|
REQUIRE(rng() == 0x6ce7909c);
|
|
}
|
|
SECTION("Specific seed") {
|
|
rng.seed(0xabcd1234);
|
|
REQUIRE(rng() == 0x57c08495);
|
|
REQUIRE(rng() == 0x33c956ac);
|
|
REQUIRE(rng() == 0x2206fd76);
|
|
REQUIRE(rng() == 0x3501a35b);
|
|
REQUIRE(rng() == 0xfdffb30f);
|
|
|
|
// Also check repeated output after reseeding
|
|
rng.seed(0xabcd1234);
|
|
REQUIRE(rng() == 0x57c08495);
|
|
REQUIRE(rng() == 0x33c956ac);
|
|
REQUIRE(rng() == 0x2206fd76);
|
|
REQUIRE(rng() == 0x3501a35b);
|
|
REQUIRE(rng() == 0xfdffb30f);
|
|
}
|
|
}
|
|
|
|
TEST_CASE("Comparison ops", "[rng]") {
|
|
using Catch::SimplePcg32;
|
|
REQUIRE(SimplePcg32{} == SimplePcg32{});
|
|
REQUIRE(SimplePcg32{ 0 } != SimplePcg32{});
|
|
REQUIRE_FALSE(SimplePcg32{ 1 } == SimplePcg32{ 2 });
|
|
REQUIRE_FALSE(SimplePcg32{ 1 } != SimplePcg32{ 1 });
|
|
}
|
|
|
|
TEST_CASE("Random seed generation reports unknown methods", "[rng][seed]") {
|
|
REQUIRE_THROWS(Catch::generateRandomSeed(static_cast<Catch::GenerateFrom>(77)));
|
|
}
|
|
|
|
TEST_CASE("Random seed generation accepts known methods", "[rng][seed]") {
|
|
using Catch::GenerateFrom;
|
|
const auto method = GENERATE(
|
|
GenerateFrom::Time,
|
|
GenerateFrom::RandomDevice,
|
|
GenerateFrom::Default
|
|
);
|
|
|
|
REQUIRE_NOTHROW(Catch::generateRandomSeed(method));
|
|
}
|
|
|
|
TEMPLATE_TEST_CASE("uniform_floating_point_distribution never returns infs from finite range",
|
|
"[rng][distribution][floating-point][approvals]", float, double) {
|
|
std::random_device rd{};
|
|
Catch::SimplePcg32 pcg( rd() );
|
|
Catch::uniform_floating_point_distribution<TestType> dist(
|
|
-std::numeric_limits<TestType>::max(),
|
|
std::numeric_limits<TestType>::max() );
|
|
|
|
for (size_t i = 0; i < 10'000; ++i) {
|
|
auto ret = dist( pcg );
|
|
REQUIRE_FALSE( std::isinf( ret ) );
|
|
REQUIRE_FALSE( std::isnan( ret ) );
|
|
}
|
|
}
|
|
|
|
TEST_CASE( "fillBitsFrom - shortening and stretching", "[rng][approvals]" ) {
|
|
using Catch::Detail::fillBitsFrom;
|
|
|
|
// The seed is not important, but the numbers below have to be repeatable.
|
|
// They should also exhibit the same general pattern of being prefixes
|
|
Catch::SimplePcg32 pcg( 0xaabb'ccdd );
|
|
|
|
SECTION( "Shorten to 8 bits" ) {
|
|
// We cast the result to avoid dealing with char-like type in uint8_t
|
|
auto shortened = static_cast<uint32_t>( fillBitsFrom<uint8_t>( pcg ) );
|
|
REQUIRE( shortened == 0xcc );
|
|
}
|
|
SECTION( "Shorten to 16 bits" ) {
|
|
auto shortened = fillBitsFrom<uint16_t>( pcg );
|
|
REQUIRE( shortened == 0xccbe );
|
|
}
|
|
SECTION( "Keep at 32 bits" ) {
|
|
auto n = fillBitsFrom<uint32_t>( pcg );
|
|
REQUIRE( n == 0xccbe'5f04 );
|
|
}
|
|
SECTION( "Stretch to 64 bits" ) {
|
|
auto stretched = fillBitsFrom<uint64_t>( pcg );
|
|
REQUIRE( stretched == 0xccbe'5f04'a424'a486 );
|
|
}
|
|
}
|
|
|
|
TEST_CASE("uniform_integer_distribution can return the bounds", "[rng][distribution]") {
|
|
Catch::uniform_integer_distribution<int32_t> dist( -10, 10 );
|
|
REQUIRE( dist.a() == -10 );
|
|
REQUIRE( dist.b() == 10 );
|
|
}
|
|
|
|
namespace {
|
|
template <typename T>
|
|
static void CheckReturnValue(Catch::uniform_integer_distribution<T>& dist,
|
|
Catch::SimplePcg32& rng,
|
|
T target) {
|
|
REQUIRE( dist.a() == dist.b() );
|
|
for (int i = 0; i < 1'000; ++i) {
|
|
REQUIRE( dist( rng ) == target );
|
|
}
|
|
}
|
|
}
|
|
|
|
TEMPLATE_TEST_CASE( "uniform_integer_distribution can handle unit ranges",
|
|
"[rng][distribution][approvals]",
|
|
unsigned char,
|
|
signed char,
|
|
char,
|
|
uint8_t,
|
|
int8_t,
|
|
uint16_t,
|
|
int16_t,
|
|
uint32_t,
|
|
int32_t,
|
|
uint64_t,
|
|
int64_t ) {
|
|
// We want random seed to sample different parts of the rng state,
|
|
// the output is predetermined anyway
|
|
std::random_device rd;
|
|
auto seed = rd();
|
|
CAPTURE( seed );
|
|
Catch::SimplePcg32 pcg( seed );
|
|
|
|
// We check unitary ranges of 3 different values, min for type, max for type,
|
|
// some value inbetween just to make sure
|
|
SECTION("lowest value") {
|
|
constexpr auto lowest = std::numeric_limits<TestType>::min();
|
|
Catch::uniform_integer_distribution<TestType> dist( lowest, lowest );
|
|
CheckReturnValue( dist, pcg, lowest );
|
|
}
|
|
SECTION( "highest value" ) {
|
|
constexpr auto highest = std::numeric_limits<TestType>::max();
|
|
Catch::uniform_integer_distribution<TestType> dist( highest, highest );
|
|
CheckReturnValue( dist, pcg, highest );
|
|
}
|
|
SECTION( "some value" ) {
|
|
constexpr auto some = TestType( 42 );
|
|
Catch::uniform_integer_distribution<TestType> dist( some, some );
|
|
CheckReturnValue( dist, pcg, some );
|
|
}
|
|
}
|
|
|
|
// Bool needs its own test because it doesn't have a valid "third" value
|
|
TEST_CASE( "uniform_integer_distribution can handle boolean unit ranges",
|
|
"[rng][distribution][approvals]" ) {
|
|
// We want random seed to sample different parts of the rng state,
|
|
// the output is predetermined anyway
|
|
std::random_device rd;
|
|
auto seed = rd();
|
|
CAPTURE( seed );
|
|
Catch::SimplePcg32 pcg( seed );
|
|
|
|
// We check unitary ranges of 3 different values, min for type, max for
|
|
// type, some value inbetween just to make sure
|
|
SECTION( "lowest value" ) {
|
|
Catch::uniform_integer_distribution<bool> dist( false, false );
|
|
CheckReturnValue( dist, pcg, false );
|
|
}
|
|
SECTION( "highest value" ) {
|
|
Catch::uniform_integer_distribution<bool> dist( true, true );
|
|
CheckReturnValue( dist, pcg, true );
|
|
}
|
|
}
|
|
|
|
TEMPLATE_TEST_CASE( "uniform_integer_distribution can handle full width ranges",
|
|
"[rng][distribution][approvals]",
|
|
unsigned char,
|
|
signed char,
|
|
char,
|
|
uint8_t,
|
|
int8_t,
|
|
uint16_t,
|
|
int16_t,
|
|
uint32_t,
|
|
int32_t,
|
|
uint64_t,
|
|
int64_t ) {
|
|
// We want random seed to sample different parts of the rng state,
|
|
// the output is predetermined anyway
|
|
std::random_device rd;
|
|
auto seed = rd();
|
|
CAPTURE( seed );
|
|
Catch::SimplePcg32 pcg( seed );
|
|
|
|
constexpr auto lowest = std::numeric_limits<TestType>::min();
|
|
constexpr auto highest = std::numeric_limits<TestType>::max();
|
|
Catch::uniform_integer_distribution<TestType> dist( lowest, highest );
|
|
STATIC_REQUIRE( std::is_same<TestType, decltype( dist( pcg ) )>::value );
|
|
|
|
// We need to do bit operations on the results, so we will have to
|
|
// cast them to unsigned type.
|
|
using BitType = std::make_unsigned_t<TestType>;
|
|
BitType ORs = 0;
|
|
BitType ANDs = BitType(-1);
|
|
for (int i = 0; i < 100; ++i) {
|
|
auto bits = static_cast<BitType>( dist( pcg ) );
|
|
ORs |= bits;
|
|
ANDs &= bits;
|
|
}
|
|
// Assuming both our RNG and distribution are unbiased, asking for
|
|
// the full range should essentially give us random bit generator.
|
|
// Over long run, OR of all the generated values should have all
|
|
// bits set to 1, while AND should have all bits set to 0.
|
|
// The chance of this test failing for unbiased pipeline is
|
|
// 1 / 2**iters, which for 100 iterations is astronomical.
|
|
REQUIRE( ORs == BitType( -1 ) );
|
|
REQUIRE( ANDs == 0 );
|
|
}
|
|
|
|
namespace {
|
|
template <typename T>
|
|
struct uniform_integer_test_params;
|
|
|
|
template <>
|
|
struct uniform_integer_test_params<bool> {
|
|
static constexpr bool lowest = false;
|
|
static constexpr bool highest = true;
|
|
// This seems weird, but it is an artifact of the specific seed
|
|
static constexpr bool expected[] = { true,
|
|
true,
|
|
true,
|
|
true,
|
|
true,
|
|
true,
|
|
false,
|
|
true,
|
|
true,
|
|
true,
|
|
true,
|
|
true,
|
|
false,
|
|
true,
|
|
true };
|
|
};
|
|
|
|
template <>
|
|
struct uniform_integer_test_params<char> {
|
|
static constexpr char lowest = 32;
|
|
static constexpr char highest = 126;
|
|
static constexpr char expected[] = { 'k',
|
|
'\\',
|
|
'Z',
|
|
'X',
|
|
'`',
|
|
'Q',
|
|
';',
|
|
'o',
|
|
']',
|
|
'T',
|
|
'v',
|
|
'p',
|
|
':',
|
|
'S',
|
|
't' };
|
|
};
|
|
|
|
template <>
|
|
struct uniform_integer_test_params<uint8_t> {
|
|
static constexpr uint8_t lowest = 3;
|
|
static constexpr uint8_t highest = 123;
|
|
static constexpr uint8_t expected[] = { 'c',
|
|
'P',
|
|
'M',
|
|
'J',
|
|
'U',
|
|
'A',
|
|
'%',
|
|
'h',
|
|
'Q',
|
|
'F',
|
|
'q',
|
|
'i',
|
|
'$',
|
|
'E',
|
|
'o' };
|
|
};
|
|
|
|
template <>
|
|
struct uniform_integer_test_params<int8_t> {
|
|
static constexpr int8_t lowest = -27;
|
|
static constexpr int8_t highest = 73;
|
|
static constexpr int8_t expected[] = { '5',
|
|
'%',
|
|
'#',
|
|
' ',
|
|
'*',
|
|
25,
|
|
2,
|
|
'9',
|
|
'&',
|
|
29,
|
|
'A',
|
|
':',
|
|
1,
|
|
28,
|
|
'?' };
|
|
};
|
|
|
|
template <>
|
|
struct uniform_integer_test_params<uint16_t> {
|
|
static constexpr uint16_t lowest = 123;
|
|
static constexpr uint16_t highest = 33333;
|
|
static constexpr uint16_t expected[] = { 26684,
|
|
21417,
|
|
20658,
|
|
19791,
|
|
22896,
|
|
17433,
|
|
9806,
|
|
27948,
|
|
21767,
|
|
18588,
|
|
30556,
|
|
28244,
|
|
9439,
|
|
18293,
|
|
29949 };
|
|
};
|
|
|
|
template <>
|
|
struct uniform_integer_test_params<int16_t> {
|
|
static constexpr int16_t lowest = -17222;
|
|
static constexpr int16_t highest = 17222;
|
|
static constexpr int16_t expected[] = { 10326,
|
|
4863,
|
|
4076,
|
|
3177,
|
|
6397,
|
|
731,
|
|
-7179,
|
|
11637,
|
|
5226,
|
|
1929,
|
|
14342,
|
|
11944,
|
|
-7560,
|
|
1623,
|
|
13712 };
|
|
};
|
|
|
|
template <>
|
|
struct uniform_integer_test_params<uint32_t> {
|
|
static constexpr uint32_t lowest = 17222;
|
|
static constexpr uint32_t highest = 234234;
|
|
static constexpr uint32_t expected[] = { 190784,
|
|
156367,
|
|
151409,
|
|
145743,
|
|
166032,
|
|
130337,
|
|
80501,
|
|
199046,
|
|
158654,
|
|
137883,
|
|
216091,
|
|
200981,
|
|
78099,
|
|
135954,
|
|
212120 };
|
|
};
|
|
|
|
template <>
|
|
struct uniform_integer_test_params<int32_t> {
|
|
static constexpr int32_t lowest = -237272;
|
|
static constexpr int32_t highest = 234234;
|
|
static constexpr int32_t expected[] = { 139829,
|
|
65050,
|
|
54278,
|
|
41969,
|
|
86051,
|
|
8494,
|
|
-99785,
|
|
157781,
|
|
70021,
|
|
24890,
|
|
194815,
|
|
161985,
|
|
-105004,
|
|
20699,
|
|
186186 };
|
|
};
|
|
|
|
template <>
|
|
struct uniform_integer_test_params<uint64_t> {
|
|
static constexpr uint64_t lowest = 1234;
|
|
static constexpr uint64_t highest = 1234567890;
|
|
static constexpr uint64_t expected[] = { 987382749,
|
|
763380386,
|
|
846572137,
|
|
359990258,
|
|
804599765,
|
|
1131353566,
|
|
346324913,
|
|
1108760730,
|
|
1141693933,
|
|
856999148,
|
|
879390623,
|
|
1149485521,
|
|
900556586,
|
|
952385958,
|
|
807916408 };
|
|
};
|
|
|
|
template <>
|
|
struct uniform_integer_test_params<int64_t> {
|
|
static constexpr int64_t lowest = -1234567890;
|
|
static constexpr int64_t highest = 1234567890;
|
|
static constexpr int64_t expected[] = { 740197113,
|
|
292191940,
|
|
458575608,
|
|
-514589122,
|
|
374630781,
|
|
1028139036,
|
|
-541919840,
|
|
982953318,
|
|
1048819790,
|
|
479429651,
|
|
524212647,
|
|
1064402981,
|
|
566544615,
|
|
670203462,
|
|
381264073 };
|
|
};
|
|
|
|
// We need these definitions for C++14 and earlier, but
|
|
// GCC will complain about them in newer C++ standards
|
|
#if __cplusplus <= 201402L
|
|
constexpr bool uniform_integer_test_params<bool>::expected[];
|
|
constexpr char uniform_integer_test_params<char>::expected[];
|
|
constexpr uint8_t uniform_integer_test_params<uint8_t>::expected[];
|
|
constexpr int8_t uniform_integer_test_params<int8_t>::expected[];
|
|
constexpr uint16_t uniform_integer_test_params<uint16_t>::expected[];
|
|
constexpr int16_t uniform_integer_test_params<int16_t>::expected[];
|
|
constexpr uint32_t uniform_integer_test_params<uint32_t>::expected[];
|
|
constexpr int32_t uniform_integer_test_params<int32_t>::expected[];
|
|
constexpr uint64_t uniform_integer_test_params<uint64_t>::expected[];
|
|
constexpr int64_t uniform_integer_test_params<int64_t>::expected[];
|
|
#endif
|
|
|
|
}
|
|
|
|
TEMPLATE_TEST_CASE( "uniform_integer_distribution is reproducible",
|
|
"[rng][distribution][approvals]",
|
|
bool,
|
|
char,
|
|
uint8_t,
|
|
int8_t,
|
|
uint16_t,
|
|
int16_t,
|
|
uint32_t,
|
|
int32_t,
|
|
uint64_t,
|
|
int64_t) {
|
|
Catch::SimplePcg32 pcg( 0xaabb'ccdd );
|
|
|
|
constexpr auto lowest = uniform_integer_test_params<TestType>::lowest;
|
|
constexpr auto highest = uniform_integer_test_params<TestType>::highest;
|
|
Catch::uniform_integer_distribution<TestType> dist(lowest, highest);
|
|
|
|
constexpr auto iters = 15;
|
|
std::array<TestType, iters> generated;
|
|
for (int i = 0; i < iters; ++i) {
|
|
generated[i] = dist( pcg );
|
|
}
|
|
|
|
REQUIRE_THAT(generated, Catch::Matchers::RangeEquals(uniform_integer_test_params<TestType>::expected));
|
|
}
|
|
|
|
|
|
namespace {
|
|
template <typename T>
|
|
struct uniform_fp_test_params;
|
|
|
|
template<>
|
|
struct uniform_fp_test_params<float> {
|
|
// These are exactly representable
|
|
static constexpr float lowest = -256.125f;
|
|
static constexpr float highest = 385.125f;
|
|
// These are just round-trip formatted
|
|
static constexpr float expected[] = { 92.56961f,
|
|
-23.170044f,
|
|
310.81833f,
|
|
-53.023132f,
|
|
105.03287f,
|
|
198.77591f,
|
|
-172.72931f,
|
|
51.805176f,
|
|
-241.10156f,
|
|
64.66101f,
|
|
212.12509f,
|
|
-49.24292f,
|
|
-177.1399f,
|
|
245.23679f,
|
|
173.22421f };
|
|
};
|
|
template <>
|
|
struct uniform_fp_test_params<double> {
|
|
// These are exactly representable
|
|
static constexpr double lowest = -234582.9921875;
|
|
static constexpr double highest = 261238.015625;
|
|
// These are just round-trip formatted
|
|
static constexpr double expected[] = { 35031.207052832615,
|
|
203783.3401838024,
|
|
44667.940405848756,
|
|
-170100.5877224467,
|
|
-222966.7418051684,
|
|
127472.72630072923,
|
|
-173510.88209096913,
|
|
97394.16172239158,
|
|
119123.6921592663,
|
|
22595.741022785165,
|
|
8988.68409120926,
|
|
136906.86520606978,
|
|
33369.19104222473,
|
|
60912.7615841752,
|
|
-149060.05936760217 };
|
|
};
|
|
|
|
// We need these definitions for C++14 and earlier, but
|
|
// GCC will complain about them in newer C++ standards
|
|
#if __cplusplus <= 201402L
|
|
constexpr float uniform_fp_test_params<float>::expected[];
|
|
constexpr double uniform_fp_test_params<double>::expected[];
|
|
#endif
|
|
} // namespace
|
|
|
|
TEMPLATE_TEST_CASE( "uniform_floating_point_distribution is reproducible",
|
|
"[rng][distribution][floating-point][approvals]",
|
|
float,
|
|
double ) {
|
|
Catch::SimplePcg32 pcg( 0xaabb'aabb );
|
|
|
|
const auto lowest = uniform_fp_test_params<TestType>::lowest;
|
|
const auto highest = uniform_fp_test_params<TestType>::highest;
|
|
Catch::uniform_floating_point_distribution<TestType> dist( lowest, highest );
|
|
|
|
constexpr auto iters = 15;
|
|
std::array<TestType, iters> generated;
|
|
for ( int i = 0; i < iters; ++i ) {
|
|
generated[i] = dist( pcg );
|
|
}
|
|
|
|
REQUIRE_THAT( generated, Catch::Matchers::RangeEquals( uniform_fp_test_params<TestType>::expected ) );
|
|
}
|
|
|
|
TEMPLATE_TEST_CASE( "uniform_floating_point_distribution can handle unitary ranges",
|
|
"[rng][distribution][floating-point][approvals]",
|
|
float,
|
|
double ) {
|
|
std::random_device rd;
|
|
auto seed = rd();
|
|
CAPTURE( seed );
|
|
Catch::SimplePcg32 pcg( seed );
|
|
|
|
const auto highest = uniform_fp_test_params<TestType>::highest;
|
|
Catch::uniform_floating_point_distribution<TestType> dist( highest,
|
|
highest );
|
|
|
|
constexpr auto iters = 20;
|
|
for (int i = 0; i < iters; ++i) {
|
|
REQUIRE( Catch::Detail::directCompare( dist( pcg ), highest ) );
|
|
}
|
|
}
|