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nodejs/test/parallel/test-child-process-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

78 lines
2.4 KiB
JavaScript

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
'use strict';
const common = require('../common');
const assert = require('assert');
const { spawn } = require('child_process');
// Test stdio piping.
{
const child = spawn(...common.pwdCommand, { stdio: ['pipe'] });
assert.notStrictEqual(child.stdout, null);
assert.notStrictEqual(child.stderr, null);
}
// Test stdio ignoring.
{
const child = spawn(...common.pwdCommand, { stdio: 'ignore' });
assert.strictEqual(child.stdout, null);
assert.strictEqual(child.stderr, null);
}
// Asset options invariance.
{
const options = { stdio: 'ignore' };
spawn(...common.pwdCommand, options);
assert.deepStrictEqual(options, { stdio: 'ignore' });
}
// Test stdout buffering.
{
let output = '';
const child = spawn(...common.pwdCommand);
child.stdout.setEncoding('utf8');
child.stdout.on('data', function(s) {
output += s;
});
child.on('exit', common.mustCall(function(code) {
assert.strictEqual(code, 0);
}));
child.on('close', common.mustCall(function() {
assert.strictEqual(output.length > 1, true);
assert.strictEqual(output[output.length - 1], '\n');
}));
}
// Assert only one IPC pipe allowed.
assert.throws(
() => {
spawn(
...common.pwdCommand,
{ stdio: ['pipe', 'pipe', 'pipe', 'ipc', 'ipc'] }
);
},
{ code: 'ERR_IPC_ONE_PIPE', name: 'Error' }
);