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