nodejs/test/parallel/test-child-process-exec-env.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
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// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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'use strict';
const common = require('../common');
const assert = require('assert');
const exec = require('child_process').exec;
let success_count = 0;
let error_count = 0;
let response = '';
let child;

function after(err, stdout, stderr) {
  if (err) {
    error_count++;
    console.log(`error!: ${err.code}`);
    console.log(`stdout: ${JSON.stringify(stdout)}`);
    console.log(`stderr: ${JSON.stringify(stderr)}`);
    assert.strictEqual(false, err.killed);
  } else {
    success_count++;
    assert.notStrictEqual('', stdout);
  }
}

if (!common.isWindows) {
  child = exec('/usr/bin/env', { env: { 'HELLO': 'WORLD' } }, after);
} else {
  child = exec('set',
               { env: Object.assign({}, process.env, { 'HELLO': 'WORLD' }) },
               after);
}

child.stdout.setEncoding('utf8');
child.stdout.on('data', function(chunk) {
  response += chunk;
});

process.on('exit', function() {
  console.log('response: ', response);
  assert.strictEqual(1, success_count);
  assert.strictEqual(0, error_count);
  assert.ok(response.includes('HELLO=WORLD'));
});