Arbutils/tests/RandomTests.cpp

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#ifdef TESTS_BUILD
#define CATCH_CONFIG_MAIN
#include "../extern/catch.hpp"
#include "../src/Random.hpp"
TEST_CASE("Random ints", "[Utilities]") {
auto rand = Arbutils::Random(10);
CHECK(rand.Get() == 1234817989);
CHECK(rand.Get() == 1171957426);
CHECK(rand.Get() == 275100647);
CHECK(rand.Get() == 1033685688);
CHECK(rand.Get() == 180895192);
CHECK(rand.Get() == 135557292);
CHECK(rand.Get() == 716914271);
CHECK(rand.Get() == 1012211222);
CHECK(rand.Get() == -2109244634);
CHECK(rand.Get() == -1647742638);
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}
TEST_CASE("Random ints with limit", "[Utilities]") {
auto rand = Arbutils::Random(10);
CHECK(rand.Get(10) == 2);
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CHECK(rand.Get(10) == 2);
CHECK(rand.Get(10) == 0);
CHECK(rand.Get(10) == 2);
CHECK(rand.Get(10) == 0);
CHECK(rand.Get(10) == 0);
CHECK(rand.Get(10) == 1);
CHECK(rand.Get(10) == 2);
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CHECK(rand.Get(10) == 5);
CHECK(rand.Get(10) == 6);
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CHECK(rand.Get(2) == 0);
CHECK(rand.Get(2) == 0);
CHECK(rand.Get(2) == 1);
CHECK(rand.Get(2) == 1);
CHECK(rand.Get(2) == 0);
CHECK(rand.Get(2) == 0);
CHECK(rand.Get(2) == 0);
CHECK(rand.Get(2) == 1);
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CHECK(rand.Get(2) == 0);
}
TEST_CASE("Random ints with upper and bottom", "[Utilities]") {
auto rand = Arbutils::Random(10);
CHECK(rand.Get(10, 30) == 15);
CHECK(rand.Get(10, 30) == 15);
CHECK(rand.Get(10, 30) == 11);
CHECK(rand.Get(10, 30) == 14);
CHECK(rand.Get(10, 30) == 10);
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CHECK(rand.Get(10, 30) == 10);
CHECK(rand.Get(10, 30) == 13);
CHECK(rand.Get(10, 30) == 14);
CHECK(rand.Get(10, 30) == 20);
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CHECK(rand.Get(10, 30) == 22);
}
TEST_CASE("Random distribution (max 0, min 1)", "[Utilities]") {
auto rand = Arbutils::Random(10);
const int size = 100000;
int arr[size];
for (size_t i = 0; i < size; i++) {
arr[i] = rand.Get(0, 1);
}
for (size_t i = 0; i < size; i++) {
if (arr[i] != 0)
FAIL("We expected a value of 0 here, but got a " + std::to_string(arr[i]));
}
}
TEST_CASE("Random distribution (max 0, min 2)", "[Utilities]") {
auto rand = Arbutils::Random(10);
const int size = 100000;
int arr[size];
for (size_t i = 0; i < size; i++) {
arr[i] = rand.Get(0, 2);
}
auto numZeros = 0;
auto numOnes = 0;
for (size_t i = 0; i < size; i++) {
if (arr[i] != 0 && arr[i] != 1)
FAIL("We expected a value of 0 or 1 here, but got a " + std::to_string(arr[i]));
if (arr[i] == 0)
numZeros++;
else
numOnes++;
}
auto div = static_cast<float>(numZeros) / static_cast<float>(numOnes);
INFO("Distribution: " << numZeros << "/" << numOnes);
CHECK(Approx(div).margin(0.01) == 1);
}
TEST_CASE("Random distribution (max 0, min 3)", "[Utilities]") {
auto rand = Arbutils::Random(10);
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const size_t size = 100000;
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int arr[size];
for (size_t i = 0; i < size; i++) {
arr[i] = rand.Get(0, 3);
}
auto numZeros = 0;
auto numOnes = 0;
auto numTwos = 0;
for (size_t i = 0; i < size; i++) {
if (arr[i] != 0 && arr[i] != 1 && arr[i] != 2)
FAIL("We expected a value between 0 and 2 here, but got a " + std::to_string(arr[i]));
if (arr[i] == 0)
numZeros++;
else if (arr[i] == 1)
numOnes++;
else
numTwos++;
}
INFO("Distribution: " << numZeros << "/" << numOnes << "/" << numTwos);
CHECK(Approx(static_cast<float>(numZeros) / static_cast<float>(numOnes)).margin(0.01) == 1);
CHECK(Approx(static_cast<float>(numZeros) / static_cast<float>(numTwos)).margin(0.01) == 1);
CHECK(Approx(static_cast<float>(numOnes) / static_cast<float>(numTwos)).margin(0.01) == 1);
}
#endif