255 lines
8.6 KiB
C++
255 lines
8.6 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] Float") {
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Ref<RandomNumberGenerator> rng = memnew(RandomNumberGenerator);
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rng->set_seed(0);
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INFO("Should give float between 0.0 and 1.0.");
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for (int i = 0; i < 1000; i++) {
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real_t n = rng->randf();
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CHECK(n >= 0.0);
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CHECK(n <= 1.0);
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}
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}
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TEST_CASE("[RandomNumberGenerator] Integer range via modulo") {
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Ref<RandomNumberGenerator> rng = memnew(RandomNumberGenerator);
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rng->set_seed(0);
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INFO("Should give integer between 0 and 100.");
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for (int i = 0; i < 1000; i++) {
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uint32_t n = rng->randi() % 100;
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CHECK(n >= 0);
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CHECK(n <= 100);
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}
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}
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TEST_CASE_MAY_FAIL("[RandomNumberGenerator] Integer 32 bit") {
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Ref<RandomNumberGenerator> rng = memnew(RandomNumberGenerator);
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rng->set_seed(0); // Change the seed if this fails.
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bool higher = false;
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int i;
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for (i = 0; i < 1000; i++) {
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uint32_t n = rng->randi();
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if (n > 0x0fff'ffff) {
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higher = true;
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break;
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}
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}
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INFO("Current seed: " << rng->get_seed());
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INFO("Current iteration: " << i);
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CHECK_MESSAGE(higher, "Given current seed, this should give an integer higher than 0x0fff'ffff at least once.");
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}
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TEST_CASE("[RandomNumberGenerator] Float and integer range") {
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Ref<RandomNumberGenerator> rng = memnew(RandomNumberGenerator);
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rng->set_seed(0);
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uint64_t initial_state = rng->get_state();
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uint32_t initial_seed = rng->get_seed();
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INFO("Should give float between -100.0 and 100.0, base test.");
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for (int i = 0; i < 1000; i++) {
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real_t n0 = rng->randf_range(-100.0, 100.0);
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CHECK(n0 >= -100);
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CHECK(n0 <= 100);
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}
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rng->randomize();
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INFO("Should give float between -75.0 and 75.0.");
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INFO("Shouldn't be affected by randomize.");
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for (int i = 0; i < 1000; i++) {
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real_t n1 = rng->randf_range(-75.0, 75.0);
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CHECK(n1 >= -75);
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CHECK(n1 <= 75);
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}
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rng->set_state(initial_state);
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INFO("Should give integer between -50 and 50.");
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INFO("Shouldn't be affected by set_state.");
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for (int i = 0; i < 1000; i++) {
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real_t n2 = rng->randi_range(-50, 50);
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CHECK(n2 >= -50);
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CHECK(n2 <= 50);
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}
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rng->set_seed(initial_seed);
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INFO("Should give integer between -25 and 25.");
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INFO("Shouldn't be affected by set_seed.");
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for (int i = 0; i < 1000; i++) {
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int32_t n3 = rng->randi_range(-25, 25);
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CHECK(n3 >= -25);
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CHECK(n3 <= 25);
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}
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rng->randf();
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rng->randf();
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INFO("Should give float between -10.0 and 10.0.");
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INFO("Shouldn't be affected after generating new numbers.");
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for (int i = 0; i < 1000; i++) {
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real_t n4 = rng->randf_range(-10.0, 10.0);
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CHECK(n4 >= -10);
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CHECK(n4 <= 10);
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}
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rng->randi();
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rng->randi();
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INFO("Should give integer between -5 and 5.");
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INFO("Shouldn't be affected after generating new numbers.");
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for (int i = 0; i < 1000; i++) {
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real_t n5 = rng->randf_range(-5, 5);
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CHECK(n5 >= -5);
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CHECK(n5 <= 5);
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}
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}
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TEST_CASE_MAY_FAIL("[RandomNumberGenerator] Normal distribution") {
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Ref<RandomNumberGenerator> rng = memnew(RandomNumberGenerator);
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rng->set_seed(1); // Change the seed if this fails.
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INFO("Should give a number between -5 to 5 (5 std deviations away; above 99.7% chance it will be in this range).");
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INFO("Standard randfn function call.");
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for (int i = 0; i < 100; i++) {
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real_t n = rng->randfn();
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CHECK(n >= -5);
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CHECK(n <= 5);
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}
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INFO("Should give number between -5 to 5 after multiple randi/randf calls.");
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INFO("5 std deviations away; above 99.7% chance it will be in this range.");
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rng->randf();
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rng->randi();
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for (int i = 0; i < 100; i++) {
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real_t n = rng->randfn();
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CHECK(n >= -5);
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CHECK(n <= 5);
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}
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INFO("Checks if user defined mean and deviation work properly.");
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INFO("5 std deviations away; above 99.7% chance it will be in this range.");
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for (int i = 0; i < 100; i++) {
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real_t n = rng->randfn(5, 10);
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CHECK(n >= -45);
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CHECK(n <= 55);
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}
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INFO("Checks if randfn works with changed seeds.");
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INFO("5 std deviations away; above 99.7% chance it will be in this range.");
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rng->randomize();
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for (int i = 0; i < 100; i++) {
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real_t n = rng->randfn(3, 3);
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CHECK(n >= -12);
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CHECK(n <= 18);
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}
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}
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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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