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Introduce Catch's own RNG based on the PCG family of RNGs

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In the future, we will also want to introduce our own
`uniform_int_distribution` and `uniform_real_distribution` to get
repeatable test runs across different platforms.
This commit is contained in:
Martin Hořeňovský 2019-10-06 21:47:54 +02:00
parent 319cb9e1da
commit 535da5c513
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GPG key ID: DE48307B8B0D381A
14 changed files with 565 additions and 23 deletions
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45
projects/SelfTest/IntrospectiveTests/RandomNumberGeneration.tests.cpp Normal file
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/*
* Created by Martin on 06/10/2019.
*
* Distributed under the Boost Software License, Version 1.0. (See accompanying
* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
*/
#include "catch.hpp"
#include "internal/catch_random_number_generator.h"
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 });
}