#pragma once
#include <string>

std::string getGreeting();

#include "Greeting.h"

std::string getGreeting() {
  return "Hello world!";
}

#pragma once
void test();

#include "Test.h"
#include "Greeting.h"

#include <cassert>
#include <iostream>

void test() {
  auto greeting = getGreeting();
  assert(greeting == "Hello world!");
  std::cout << "Test passes!n";
}

#include "Test.h"
#include "Greeting.h"

#include <iostream>

void run() {
  std::cout << getGreeting() << "n";
}

int main(int argc, char *argv[]) {
  if (argc > 1 && strcmp(argv[1], "-t") == 0)
    test();
  else
    run();
}