2022-01-29 00:03:43 +01:00
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// Copyright Catch2 Authors
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// Distributed under the Boost Software License, Version 1.0.
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2022-10-28 11:22:53 +02:00
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// (See accompanying file LICENSE.txt or copy at
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2022-01-29 00:03:43 +01:00
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// https://www.boost.org/LICENSE_1_0.txt)
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// SPDX-License-Identifier: BSL-1.0
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2019-10-06 21:47:54 +02:00
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2020-01-20 23:24:04 +01:00
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#include <catch2/catch_test_macros.hpp>
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2023-11-20 15:16:50 +01:00
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#include <catch2/catch_template_test_macros.hpp>
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2020-03-30 10:34:21 +02:00
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#include <catch2/internal/catch_random_number_generator.hpp>
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2021-10-08 20:02:24 +02:00
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#include <catch2/internal/catch_random_seed_generation.hpp>
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2023-11-20 15:16:50 +01:00
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#include <catch2/internal/catch_uniform_floating_point_distribution.hpp>
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2021-10-08 20:02:24 +02:00
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#include <catch2/generators/catch_generators.hpp>
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2019-10-06 21:47:54 +02:00
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TEST_CASE("Our PCG implementation provides expected results for known seeds", "[rng]") {
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Catch::SimplePcg32 rng;
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SECTION("Default seeded") {
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REQUIRE(rng() == 0xfcdb943b);
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REQUIRE(rng() == 0x6f55b921);
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REQUIRE(rng() == 0x4c17a916);
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REQUIRE(rng() == 0x71eae25f);
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REQUIRE(rng() == 0x6ce7909c);
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}
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SECTION("Specific seed") {
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rng.seed(0xabcd1234);
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REQUIRE(rng() == 0x57c08495);
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REQUIRE(rng() == 0x33c956ac);
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REQUIRE(rng() == 0x2206fd76);
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REQUIRE(rng() == 0x3501a35b);
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REQUIRE(rng() == 0xfdffb30f);
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// Also check repeated output after reseeding
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rng.seed(0xabcd1234);
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REQUIRE(rng() == 0x57c08495);
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REQUIRE(rng() == 0x33c956ac);
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REQUIRE(rng() == 0x2206fd76);
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REQUIRE(rng() == 0x3501a35b);
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REQUIRE(rng() == 0xfdffb30f);
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}
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}
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TEST_CASE("Comparison ops", "[rng]") {
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using Catch::SimplePcg32;
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REQUIRE(SimplePcg32{} == SimplePcg32{});
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REQUIRE(SimplePcg32{ 0 } != SimplePcg32{});
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REQUIRE_FALSE(SimplePcg32{ 1 } == SimplePcg32{ 2 });
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REQUIRE_FALSE(SimplePcg32{ 1 } != SimplePcg32{ 1 });
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}
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2021-10-08 20:02:24 +02:00
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TEST_CASE("Random seed generation reports unknown methods", "[rng][seed]") {
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REQUIRE_THROWS(Catch::generateRandomSeed(static_cast<Catch::GenerateFrom>(77)));
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}
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TEST_CASE("Random seed generation accepts known methods", "[rng][seed]") {
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using Catch::GenerateFrom;
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const auto method = GENERATE(
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GenerateFrom::Time,
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GenerateFrom::RandomDevice,
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GenerateFrom::Default
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);
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REQUIRE_NOTHROW(Catch::generateRandomSeed(method));
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}
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2023-11-20 15:16:50 +01:00
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TEMPLATE_TEST_CASE("uniform_floating_point_distribution never returns infs from finite range",
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"[rng][distribution][floating-point][approvals]", float, double) {
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std::random_device rd{};
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Catch::SimplePcg32 pcg( rd() );
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Catch::uniform_floating_point_distribution<TestType> dist(
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-std::numeric_limits<TestType>::max(),
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std::numeric_limits<TestType>::max() );
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for (size_t i = 0; i < 10'000; ++i) {
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auto ret = dist( pcg );
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REQUIRE_FALSE( std::isinf( ret ) );
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REQUIRE_FALSE( std::isnan( ret ) );
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}
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}
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