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

// Copyright Joyent, Inc. and other Node contributors.
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//
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// Flags: --no-warnings
'use strict';
const common = require('../common');
const assert = require('assert');
const { fork } = require('child_process');
const args = ['foo', 'bar'];
const fixtures = require('../common/fixtures');
const debug = require('util').debuglog('test');

const n = fork(fixtures.path('child-process-spawn-node.js'), args);

assert.strictEqual(n.channel, n._channel);
assert.deepStrictEqual(args, ['foo', 'bar']);

n.on('message', (m) => {
  debug('PARENT got message:', m);
  assert.ok(m.foo);
});

// https://github.com/joyent/node/issues/2355 - JSON.stringify(undefined)
// returns "undefined" but JSON.parse() cannot parse that...
assert.throws(() => n.send(undefined), {
  name: 'TypeError',
  message: 'The "message" argument must be specified',
  code: 'ERR_MISSING_ARGS'
});
assert.throws(() => n.send(), {
  name: 'TypeError',
  message: 'The "message" argument must be specified',
  code: 'ERR_MISSING_ARGS'
});

assert.throws(() => n.send(Symbol()), {
  name: 'TypeError',
  message: 'The "message" argument must be one of type string,' +
           ' object, number, or boolean. Received type symbol (Symbol())',
  code: 'ERR_INVALID_ARG_TYPE'
});
n.send({ hello: 'world' });

n.on('exit', common.mustCall((c) => {
  assert.strictEqual(c, 0);
}));