CreatureLib/tests/RandomTests.cpp

#ifdef TESTS_BUILD
#include "../extern/catch.hpp"
#include "../src/Core/Random.hpp"
#include "../src/Core/Exceptions/CreatureException.hpp"

TEST_CASE( "Random ints", "[Utilities]" ) {
    auto rand = CreatureLib::Core::Random(10);
    CHECK(rand.Get() == 1656398469);
    CHECK(rand.Get() == 641584702);
    CHECK(rand.Get() == 44564466);
    CHECK(rand.Get() == 1062123783);
    CHECK(rand.Get() == 1360749216);
    CHECK(rand.Get() == 951367352);
    CHECK(rand.Get() == 1608044094);
    CHECK(rand.Get() == 1786516046);
    CHECK(rand.Get() == 1070535660);
    CHECK(rand.Get() == 1252673902);
}

TEST_CASE( "Random ints with limit", "[Utilities]" ) {
    auto rand = CreatureLib::Core::Random(10);
    CHECK(rand.Get(10) == 7);
    CHECK(rand.Get(10) == 2);
    CHECK(rand.Get(10) == 0);
    CHECK(rand.Get(10) == 4);
    CHECK(rand.Get(10) == 6);
    CHECK(rand.Get(10) == 4);
    CHECK(rand.Get(10) == 7);
    CHECK(rand.Get(10) == 8);
    CHECK(rand.Get(10) == 4);
    CHECK(rand.Get(10) == 5);

    CHECK(rand.Get(2) == 0);
    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) == 0);

}

TEST_CASE( "Random ints with upper and bottom", "[Utilities]" ) {
    auto rand = CreatureLib::Core::Random(10);
    CHECK(rand.Get(10, 30) == 25);
    CHECK(rand.Get(10, 30) == 15);
    CHECK(rand.Get(10, 30) == 10);
    CHECK(rand.Get(10, 30) == 19);
    CHECK(rand.Get(10, 30) == 22);
    CHECK(rand.Get(10, 30) == 18);
    CHECK(rand.Get(10, 30) == 24);
    CHECK(rand.Get(10, 30) == 26);
    CHECK(rand.Get(10, 30) == 19);
    CHECK(rand.Get(10, 30) == 21);
}

TEST_CASE( "Random distribution (max 0, min 1)", "[Utilities]" ) {
    auto rand = CreatureLib::Core::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)
            throw CreatureException("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 = CreatureLib::Core::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)
            throw CreatureException("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 = CreatureLib::Core::Random(10);
    const int size = 100000;
    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)
            throw CreatureException("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