node_modules/events/tests/remove-all-listeners.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// "Software"), to deal in the Software without restriction, including
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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
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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var common = require('./common');
var assert = require('assert');
var events = require('../');

var after_checks = [];
after(function() {
  for (var i=0 ; i<after_checks.length ; ++i) {
    after_checks[i]();
  }
});

function expect(expected) {
  var actual = [];
  after_checks.push(function() {
    assert.deepEqual(actual.sort(), expected.sort());
  });

  function listener(name) {
    actual.push(name)
  }
  return common.mustCall(listener, expected.length);
}

function listener() {}

var e1 = new events.EventEmitter();
e1.on('foo', listener);
e1.on('bar', listener);
e1.on('baz', listener);
e1.on('baz', listener);
var fooListeners = e1.listeners('foo');
var barListeners = e1.listeners('bar');
var bazListeners = e1.listeners('baz');
e1.on('removeListener', expect(['bar', 'baz', 'baz']));
e1.removeAllListeners('bar');
e1.removeAllListeners('baz');
assert.deepEqual(e1.listeners('foo'), [listener]);
assert.deepEqual(e1.listeners('bar'), []);
assert.deepEqual(e1.listeners('baz'), []);
// after calling removeAllListeners,
// the old listeners array should stay unchanged
assert.deepEqual(fooListeners, [listener]);
assert.deepEqual(barListeners, [listener]);
assert.deepEqual(bazListeners, [listener, listener]);
// after calling removeAllListeners,
// new listeners arrays are different from the old
assert.notEqual(e1.listeners('bar'), barListeners);
assert.notEqual(e1.listeners('baz'), bazListeners);

var e2 = new events.EventEmitter();
e2.on('foo', listener);
e2.on('bar', listener);
// expect LIFO order
e2.on('removeListener', expect(['foo', 'bar', 'removeListener']));
e2.on('removeListener', expect(['foo', 'bar']));
e2.removeAllListeners();
console.error(e2);
assert.deepEqual([], e2.listeners('foo'));
assert.deepEqual([], e2.listeners('bar'));