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Add unit test for RandomNumberGenerator

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This covers RNG functionality completely.

Co-authored-by: @vinayakmtiwari.
This commit is contained in:
Andrii Doroshenko (Xrayez) 2020-12-21 02:52:37 +02:00
parent bccbd4be90
commit b12a6cb431
2 changed files with 147 additions and 0 deletions
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3
tests/test_macros.h
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@ -41,6 +41,9 @@
// The test is skipped with this, run pending tests with `--test --no-skip`.
#define TEST_CASE_PENDING(name) TEST_CASE(name *doctest::skip())
// The test case is marked as failed, but does not fail the entire test run.
#define TEST_CASE_MAY_FAIL(name) TEST_CASE(name *doctest::may_fail())
// Temporarily disable error prints to test failure paths.
// This allows to avoid polluting the test summary with error messages.
// The `_print_error_enabled` boolean is defined in `core/print_string.cpp` and

144
tests/test_random_number_generator.h
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@ -36,6 +36,150 @@
namespace TestRandomNumberGenerator {
TEST_CASE("[RandomNumberGenerator] Float") {
Ref<RandomNumberGenerator> rng = memnew(RandomNumberGenerator);
rng->set_seed(0);
INFO("Should give float between 0.0 and 1.0.");
for (int i = 0; i < 1000; i++) {
real_t n = rng->randf();
CHECK(n >= 0.0);
CHECK(n <= 1.0);
}
}
TEST_CASE("[RandomNumberGenerator] Integer range via modulo") {
Ref<RandomNumberGenerator> rng = memnew(RandomNumberGenerator);
rng->set_seed(0);
INFO("Should give integer between 0 and 100.");
for (int i = 0; i < 1000; i++) {
uint32_t n = rng->randi() % 100;
CHECK(n >= 0);
CHECK(n <= 100);
}
}
TEST_CASE_MAY_FAIL("[RandomNumberGenerator] Integer 32 bit") {
Ref<RandomNumberGenerator> rng = memnew(RandomNumberGenerator);
rng->set_seed(0); // Change the seed if this fails.
bool higher = false;
int i;
for (i = 0; i < 1000; i++) {
uint32_t n = rng->randi();
if (n > 0x0fff'ffff) {
higher = true;
break;
}
}
INFO("Current seed: " << rng->get_seed());
INFO("Current iteration: " << i);
CHECK_MESSAGE(higher, "Given current seed, this should give an integer higher than 0x0fff'ffff at least once.");
}
TEST_CASE("[RandomNumberGenerator] Float and integer range") {
Ref<RandomNumberGenerator> rng = memnew(RandomNumberGenerator);
rng->set_seed(0);
uint64_t initial_state = rng->get_state();
uint32_t initial_seed = rng->get_seed();
INFO("Should give float between -100.0 and 100.0, base test.");
for (int i = 0; i < 1000; i++) {
real_t n0 = rng->randf_range(-100.0, 100.0);
CHECK(n0 >= -100);
CHECK(n0 <= 100);
}
rng->randomize();
INFO("Should give float between -75.0 and 75.0.");
INFO("Shouldn't be affected by randomize.");
for (int i = 0; i < 1000; i++) {
real_t n1 = rng->randf_range(-75.0, 75.0);
CHECK(n1 >= -75);
CHECK(n1 <= 75);
}
rng->set_state(initial_state);
INFO("Should give integer between -50 and 50.");
INFO("Shouldn't be affected by set_state.");
for (int i = 0; i < 1000; i++) {
real_t n2 = rng->randi_range(-50, 50);
CHECK(n2 >= -50);
CHECK(n2 <= 50);
}
rng->set_seed(initial_seed);
INFO("Should give integer between -25 and 25.");
INFO("Shouldn't be affected by set_seed.");
for (int i = 0; i < 1000; i++) {
int32_t n3 = rng->randi_range(-25, 25);
CHECK(n3 >= -25);
CHECK(n3 <= 25);
}
rng->randf();
rng->randf();
INFO("Should give float between -10.0 and 10.0.");
INFO("Shouldn't be affected after generating new numbers.");
for (int i = 0; i < 1000; i++) {
real_t n4 = rng->randf_range(-10.0, 10.0);
CHECK(n4 >= -10);
CHECK(n4 <= 10);
}
rng->randi();
rng->randi();
INFO("Should give integer between -5 and 5.");
INFO("Shouldn't be affected after generating new numbers.");
for (int i = 0; i < 1000; i++) {
real_t n5 = rng->randf_range(-5, 5);
CHECK(n5 >= -5);
CHECK(n5 <= 5);
}
}
TEST_CASE_MAY_FAIL("[RandomNumberGenerator] Normal distribution") {
Ref<RandomNumberGenerator> rng = memnew(RandomNumberGenerator);
rng->set_seed(1); // Change the seed if this fails.
INFO("Should give a number between -5 to 5 (5 std deviations away; above 99.7% chance it will be in this range).");
INFO("Standard randfn function call.");
for (int i = 0; i < 100; i++) {
real_t n = rng->randfn();
CHECK(n >= -5);
CHECK(n <= 5);
}
INFO("Should give number between -5 to 5 after multiple randi/randf calls.");
INFO("5 std deviations away; above 99.7% chance it will be in this range.");
rng->randf();
rng->randi();
for (int i = 0; i < 100; i++) {
real_t n = rng->randfn();
CHECK(n >= -5);
CHECK(n <= 5);
}
INFO("Checks if user defined mean and deviation work properly.");
INFO("5 std deviations away; above 99.7% chance it will be in this range.");
for (int i = 0; i < 100; i++) {
real_t n = rng->randfn(5, 10);
CHECK(n >= -45);
CHECK(n <= 55);
}
INFO("Checks if randfn works with changed seeds.");
INFO("5 std deviations away; above 99.7% chance it will be in this range.");
rng->randomize();
for (int i = 0; i < 100; i++) {
real_t n = rng->randfn(3, 3);
CHECK(n >= -12);
CHECK(n <= 18);
}
}
TEST_CASE("[RandomNumberGenerator] Zero for first number immediately after seeding") {
Ref<RandomNumberGenerator> rng = memnew(RandomNumberGenerator);
rng->set_seed(0);