main.cpp

#include "library.h"
#include <iostream>
#include <string>
#include <sstream>

template <typename Func, typename... Args>
void run_test(const std::string& testname, int expected, Func func, Args... args)
{
    const int actual = func(args...);

    std::cout << testname << " ";
    if (expected == actual) {
        std::cout << "PASSED\n";
    } else {
        std::cout << "FAILED, expected " << expected << ", got " << actual << "\n";
    }
}

void test1(const std::string& testname_prefix, int expected, int a, int b)
{
    run_test(testname_prefix, expected, function1, a, b);
}

void test2(const std::string& testname_prefix, int expected, int a, int b, int c)
{
    run_test(testname_prefix, expected, function2, a, b, c);
}

int main()
{
    test1("Test 1", 3, 5, 2);
    test1("Test 2", 1, 1, 2);
    test2("Test 3", 4, -1, -2, 5);
    test2("Test 4", -4, -1, 2, -3);
    test2("Test 5", 4, 1, 2, 3);
    test2("Test 6", -4, -1, 2, 2);
    test2("Test 7", -4, 4, 4, 0);
    test2("Test 8", 2, -2, -2, -3);
}