node/test/simple/test-asynclistener-remove-inflight.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// copy of this software and associated documentation files (the
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// 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.
//
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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var common = require('../common');
var assert = require('assert');

var set = 0;
var asyncNoHandleError = {
  before: function() {
    set++;
  },
  after: function() {
    set++;
  }
}

var key = process.addAsyncListener(asyncNoHandleError);

process.nextTick(function() { });

process.removeAsyncListener(key);

process.on('exit', function(code) {
  // If the exit code isn't ok then return early to throw the stack that
  // caused the bad return code.
  if (code !== 0)
    return;

  // Calling removeAsyncListener *after* a callback is scheduled
  // should not affect the handler from responding to the callback.
  assert.equal(set, 2);
  console.log('ok');
});