mirror of https://github.com/nodejs/node.git
41 lines
1.3 KiB
JavaScript
41 lines
1.3 KiB
JavaScript
// Flags: --expose-internals
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'use strict';
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const common = require('../common');
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const assert = require('assert');
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const EventEmitter = require('events');
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const dgram = require('dgram');
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const dns = require('dns');
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const { kStateSymbol } = require('internal/dgram');
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const mockError = new Error('fake DNS');
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// Monkey patch dns.lookup() so that it always fails.
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dns.lookup = function(address, family, callback) {
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process.nextTick(() => { callback(mockError); });
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};
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const socket = dgram.createSocket('udp4');
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socket.on(EventEmitter.errorMonitor, common.mustCall((err) => {
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// The DNS lookup should fail since it is monkey patched. At that point in
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// time, the send queue should be populated with the send() operation.
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assert.strictEqual(err, mockError);
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assert(Array.isArray(socket[kStateSymbol].queue));
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assert.strictEqual(socket[kStateSymbol].queue.length, 1);
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}, 3));
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socket.on('error', common.mustCall((err) => {
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assert.strictEqual(err, mockError);
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assert.strictEqual(socket[kStateSymbol].queue, undefined);
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}, 3));
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// Initiate a few send() operations, which will fail.
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socket.send('foobar', common.PORT, 'localhost');
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process.nextTick(() => {
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socket.send('foobar', common.PORT, 'localhost');
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});
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setImmediate(() => {
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socket.send('foobar', common.PORT, 'localhost');
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});
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