nodejs/test/parallel/test-net-connect-memleak.js

// Copyright Joyent, Inc. and other Node contributors.
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'use strict';
// Flags: --expose-gc

const common = require('../common');
const { onGC } = require('../common/gc');
const assert = require('assert');
const net = require('net');

// Test that the implicit listener for an 'connect' event on net.Sockets is
// added using `once()`, i.e. can be gc'ed once that event has occurred.

const server = net.createServer(common.mustCall()).listen(0);

let collected = false;
const gcListener = { ongc() { collected = true; } };

{
  const gcObject = {};
  onGC(gcObject, gcListener);

  const sock = net.createConnection(
    server.address().port,
    common.mustCall(() => {
      assert.strictEqual(gcObject, gcObject); // Keep reference alive
      assert.strictEqual(collected, false);
      setImmediate(done, sock);
    }));
}

function done(sock) {
  global.gc();
  setImmediate(() => {
    assert.strictEqual(collected, true);
    sock.end();
    server.close();
  });
}