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nodejs/test/parallel/test-child-process-fork-stdio.js
Ruben Bridgewater e038d6a1cd
test: refactor common.expectsError
This completely refactors the `expectsError` behavior: so far it's
almost identical to `assert.throws(fn, object)` in case it was used
with a function as first argument. It had a magical property check
that allowed to verify a functions `type` in case `type` was passed
used in the validation object. This pattern is now completely removed
and `assert.throws()` should be used instead.

The main intent for `common.expectsError()` is to verify error cases
for callback based APIs. This is now more flexible by accepting all
validation possibilites that `assert.throws()` accepts as well. No
magical properties exist anymore. This reduces surprising behavior
for developers who are not used to the Node.js core code base.

This has the side effect that `common` is used significantly less
frequent.

PR-URL: https://github.com/nodejs/node/pull/31092
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
2019-12-31 15:54:20 +01:00

55 lines
1.3 KiB
JavaScript

'use strict';
const common = require('../common');
const assert = require('assert');
const cp = require('child_process');
const net = require('net');
if (process.argv[2] === 'child') {
process.stdout.write('this should be ignored');
process.stderr.write('this should not be ignored');
const pipe = new net.Socket({ fd: 4 });
process.on('disconnect', () => {
pipe.unref();
});
pipe.setEncoding('utf8');
pipe.on('data', (data) => {
process.send(data);
});
} else {
assert.throws(
() => cp.fork(__filename, { stdio: ['pipe', 'pipe', 'pipe', 'pipe'] }),
{ code: 'ERR_CHILD_PROCESS_IPC_REQUIRED', name: 'Error' });
let ipc = '';
let stderr = '';
const buf = Buffer.from('data to send via pipe');
const child = cp.fork(__filename, ['child'], {
stdio: [0, 'ignore', 'pipe', 'ipc', 'pipe']
});
assert.strictEqual(child.stdout, null);
child.on('message', (msg) => {
ipc += msg;
if (ipc === buf.toString()) {
child.disconnect();
}
});
child.stderr.on('data', (chunk) => {
stderr += chunk;
});
child.on('exit', common.mustCall((code, signal) => {
assert.strictEqual(code, 0);
assert.strictEqual(signal, null);
assert.strictEqual(stderr, 'this should not be ignored');
}));
child.stdio[4].write(buf);
}