#include <catch2/catch.hpp>

auto square(int const x) -> int
{
    return x * x;
}

auto square(double const x) -> double
{
    return x * x;
}

TEST_CASE()
{

    CHECK(square(2) == 4);
    CHECK(square(2.0) == 4.0);
    CHECK(square(2.0) != 4);
}