test/parallel/test-child-process-fork-exec-path.js

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

// Test that `fork()` respects the `execPath` option.

const tmpdir = require('../common/tmpdir');
const { addLibraryPath } = require('../common/shared-lib-util');
const assert = require('assert');
const fs = require('fs');
const { fork } = require('child_process');

const msg = { test: 'this' };
const nodePath = process.execPath;
const copyPath = tmpdir.resolve('node-copy.exe');

addLibraryPath(process.env);

// Child
if (process.env.FORK) {
  assert.strictEqual(process.execPath, copyPath);
  assert.ok(process.send);
  process.send(msg);
  return process.exit();
}

// Parent
tmpdir.refresh();
assert.strictEqual(fs.existsSync(copyPath), false);
fs.copyFileSync(nodePath, copyPath, fs.constants.COPYFILE_FICLONE);
fs.chmodSync(copyPath, '0755');

const envCopy = { ...process.env, FORK: 'true' };
const child = fork(__filename, { execPath: copyPath, env: envCopy });
child.on('message', common.mustCall(function(recv) {
  assert.deepStrictEqual(recv, msg);
}));
child.on('exit', common.mustCall(function(code) {
  assert.strictEqual(code, 0);
}));