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Add test suite for `RandomNumberGenerator`

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Andrii Doroshenko (Xrayez) 2020-12-05 22:48:59 +02:00
parent b5107715f1
commit 932acad53f
2 changed files with 112 additions and 0 deletions
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1
tests/test_main.cpp
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#include "test_pck_packer.h"
#include "test_physics_2d.h"
#include "test_physics_3d.h"
#include "test_random_number_generator.h"
#include "test_rect2.h"
#include "test_render.h"
#include "test_shader_lang.h"

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tests/test_random_number_generator.h Normal file
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/*************************************************************************/
/* test_random_number_generator.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifndef TEST_RANDOM_NUMBER_GENERATOR_H
#define TEST_RANDOM_NUMBER_GENERATOR_H
#include "core/math/random_number_generator.h"
#include "tests/test_macros.h"
namespace TestRandomNumberGenerator {
TEST_CASE("[RandomNumberGenerator] Zero for first number immediately after seeding") {
Ref<RandomNumberGenerator> rng = memnew(RandomNumberGenerator);
rng->set_seed(0);
uint32_t n1 = rng->randi();
uint32_t n2 = rng->randi();
INFO("Initial random values: " << n1 << " " << n2);
CHECK(n1 != 0);
rng->set_seed(1);
uint32_t n3 = rng->randi();
uint32_t n4 = rng->randi();
INFO("Values after changing the seed: " << n3 << " " << n4);
CHECK(n3 != 0);
}
TEST_CASE("[RandomNumberGenerator] Restore state") {
Ref<RandomNumberGenerator> rng = memnew(RandomNumberGenerator);
rng->randomize();
uint64_t last_seed = rng->get_seed();
INFO("Current seed: " << last_seed);
rng->randi();
rng->randi();
CHECK_MESSAGE(rng->get_seed() == last_seed,
"The seed should remain the same after generating some numbers");
uint64_t saved_state = rng->get_state();
INFO("Current state: " << saved_state);
real_t f1_before = rng->randf();
real_t f2_before = rng->randf();
INFO("This seed produces: " << f1_before << " " << f2_before);
// Restore now.
rng->set_state(saved_state);
real_t f1_after = rng->randf();
real_t f2_after = rng->randf();
INFO("Resetting the state produces: " << f1_after << " " << f2_after);
String msg = "Should restore the sequence of numbers after resetting the state";
CHECK_MESSAGE(f1_before == f1_after, msg);
CHECK_MESSAGE(f2_before == f2_after, msg);
}
TEST_CASE("[RandomNumberGenerator] Restore from seed") {
Ref<RandomNumberGenerator> rng = memnew(RandomNumberGenerator);
rng->set_seed(0);
INFO("Current seed: " << rng->get_seed());
uint32_t s0_1_before = rng->randi();
uint32_t s0_2_before = rng->randi();
INFO("This seed produces: " << s0_1_before << " " << s0_2_before);
rng->set_seed(9000);
INFO("Current seed: " << rng->get_seed());
uint32_t s9000_1 = rng->randi();
uint32_t s9000_2 = rng->randi();
INFO("This seed produces: " << s9000_1 << " " << s9000_2);
rng->set_seed(0);
INFO("Current seed: " << rng->get_seed());
uint32_t s0_1_after = rng->randi();
uint32_t s0_2_after = rng->randi();
INFO("This seed produces: " << s0_1_after << " " << s0_2_after);
String msg = "Should restore the sequence of numbers after resetting the seed";
CHECK_MESSAGE(s0_1_before == s0_1_after, msg);
CHECK_MESSAGE(s0_2_before == s0_2_after, msg);
}
} // namespace TestRandomNumberGenerator
#endif // TEST_RANDOM_NUMBER_GENERATOR_H