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test: add test for broken child process stdio
This commit adds a test for the scenario where a child process is spawned, but the stdio streams could not be created. PR-URL: #9528 Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com> Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
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'use strict'; | ||
// Flags: --expose_internals | ||
const common = require('../common'); | ||
const assert = require('assert'); | ||
const cp = require('child_process'); | ||
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if (process.argv[2] === 'child') { | ||
setTimeout(() => {}, common.platformTimeout(100)); | ||
return; | ||
} | ||
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// Monkey patch spawn() to create a child process normally, but destroy the | ||
// stdout and stderr streams. This replicates the conditions where the streams | ||
// cannot be properly created. | ||
const ChildProcess = require('internal/child_process').ChildProcess; | ||
const original = ChildProcess.prototype.spawn; | ||
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ChildProcess.prototype.spawn = function() { | ||
const err = original.apply(this, arguments); | ||
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this.stdout.destroy(); | ||
this.stderr.destroy(); | ||
this.stdout = null; | ||
this.stderr = null; | ||
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return err; | ||
}; | ||
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function createChild(options, callback) { | ||
const cmd = `${process.execPath} ${__filename} child`; | ||
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return cp.exec(cmd, options, common.mustCall(callback)); | ||
} | ||
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// Verify that normal execution of a child process is handled. | ||
{ | ||
createChild({}, (err, stdout, stderr) => { | ||
assert.strictEqual(err, null); | ||
assert.strictEqual(stdout, ''); | ||
assert.strictEqual(stderr, ''); | ||
}); | ||
} | ||
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// Verify that execution with an error event is handled. | ||
{ | ||
const error = new Error('foo'); | ||
const child = createChild({}, (err, stdout, stderr) => { | ||
assert.strictEqual(err, error); | ||
assert.strictEqual(stdout, ''); | ||
assert.strictEqual(stderr, ''); | ||
}); | ||
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child.emit('error', error); | ||
} | ||
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// Verify that execution with a killed process is handled. | ||
{ | ||
createChild({ timeout: 1 }, (err, stdout, stderr) => { | ||
assert.strictEqual(err.killed, true); | ||
assert.strictEqual(stdout, ''); | ||
assert.strictEqual(stderr, ''); | ||
}); | ||
} |