Code I used to test my Windows Environment patch for the cpp-subprocess library

env_script.cmd

@echo off

echo "ENV1 = %NEW_ENV1%"
echo "ENV2 = %NEW_ENV2%"
echo "ENV3 = %NEW_ENV3%"

SubProcessEnvTest.cpp

#include <iostream>
#include "subprocess.hpp"

using namespace subprocess;

void test_env()
{
  auto p = Popen(
    "env_script.cmd",
	environment{
	  {
					{L"NEW_ENV1", L"VALUE-1"},
					{L"NEW_ENV2", L"VALUE-2"},
					{L"NEW_ENV3", L"VALUE-3"}
	  }
    },
	output{PIPE}
  );
  auto obuf=p.communicate().first;
  std::cout << obuf.buf.data() << std::endl;
}

int main() {
  test_env();
  return 0;
}