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

// Copyright Joyent, Inc. and other Node contributors.
//
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//
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'use strict';
const common = require('../common');
const assert = require('assert');
const os = require('os');

const spawn = require('child_process').spawn;

const env = {
  'HELLO': 'WORLD',
  'UNDEFINED': undefined,
  'NULL': null,
  'EMPTY': ''
};
Object.setPrototypeOf(env, {
  'FOO': 'BAR'
});

let child;
if (common.isWindows) {
  child = spawn('cmd.exe', ['/c', 'set'],
                Object.assign({}, process.env, { env }));
} else {
  child = spawn('/usr/bin/env', [],
                Object.assign({}, process.env, { env }));
}


let response = '';

child.stdout.setEncoding('utf8');

child.stdout.on('data', function(chunk) {
  console.log(`stdout: ${chunk}`);
  response += chunk;
});

process.on('exit', function() {
  assert.ok(response.includes('HELLO=WORLD'));
  assert.ok(response.includes('FOO=BAR'));
  assert.ok(!response.includes('UNDEFINED=undefined'));
  assert.ok(response.includes('NULL=null'));
  assert.ok(response.includes(`EMPTY=${os.EOL}`));
});