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rOACCT/node_modules/events/tests/remove-listeners.js
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remove-listeners.js
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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// 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.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// 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,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
var common = require('./common');
var assert = require('assert');
var EventEmitter = require('../');
var listener1 = function listener1() {};
var listener2 = function listener2() {};
{
var ee = new EventEmitter();
ee.on('hello', listener1);
ee.on('removeListener', common.mustCall(function(name, cb) {
assert.strictEqual(name, 'hello');
assert.strictEqual(cb, listener1);
}));
ee.removeListener('hello', listener1);
var listeners = ee.listeners('hello');
assert.ok(Array.isArray(listeners));
assert.strictEqual(listeners.length, 0);
}
{
var ee = new EventEmitter();
ee.on('hello', listener1);
ee.on('removeListener', common.mustNotCall());
ee.removeListener('hello', listener2);
var listeners = ee.listeners('hello');
assert.ok(Array.isArray(listeners));
assert.strictEqual(listeners.length, 1);
assert.strictEqual(listeners[0], listener1);
}
{
var ee = new EventEmitter();
ee.on('hello', listener1);
ee.on('hello', listener2);
var listeners;
ee.once('removeListener', common.mustCall(function(name, cb) {
assert.strictEqual(name, 'hello');
assert.strictEqual(cb, listener1);
listeners = ee.listeners('hello');
assert.ok(Array.isArray(listeners));
assert.strictEqual(listeners.length, 1);
assert.strictEqual(listeners[0], listener2);
}));
ee.removeListener('hello', listener1);
listeners = ee.listeners('hello');
assert.ok(Array.isArray(listeners));
assert.strictEqual(listeners.length, 1);
assert.strictEqual(listeners[0], listener2);
ee.once('removeListener', common.mustCall(function(name, cb) {
assert.strictEqual(name, 'hello');
assert.strictEqual(cb, listener2);
listeners = ee.listeners('hello');
assert.ok(Array.isArray(listeners));
assert.strictEqual(listeners.length, 0);
}));
ee.removeListener('hello', listener2);
listeners = ee.listeners('hello');
assert.ok(Array.isArray(listeners));
assert.strictEqual(listeners.length, 0);
}
{
var ee = new EventEmitter();
function remove1() {
assert.fail('remove1 should not have been called');
}
function remove2() {
assert.fail('remove2 should not have been called');
}
ee.on('removeListener', common.mustCall(function(name, cb) {
if (cb !== remove1) return;
this.removeListener('quux', remove2);
this.emit('quux');
}, 2));
ee.on('quux', remove1);
ee.on('quux', remove2);
ee.removeListener('quux', remove1);
}
{
var ee = new EventEmitter();
ee.on('hello', listener1);
ee.on('hello', listener2);
var listeners;
ee.once('removeListener', common.mustCall(function(name, cb) {
assert.strictEqual(name, 'hello');
assert.strictEqual(cb, listener1);
listeners = ee.listeners('hello');
assert.ok(Array.isArray(listeners));
assert.strictEqual(listeners.length, 1);
assert.strictEqual(listeners[0], listener2);
ee.once('removeListener', common.mustCall(function(name, cb) {
assert.strictEqual(name, 'hello');
assert.strictEqual(cb, listener2);
listeners = ee.listeners('hello');
assert.ok(Array.isArray(listeners));
assert.strictEqual(listeners.length, 0);
}));
ee.removeListener('hello', listener2);
listeners = ee.listeners('hello');
assert.ok(Array.isArray(listeners));
assert.strictEqual(listeners.length, 0);
}));
ee.removeListener('hello', listener1);
listeners = ee.listeners('hello');
assert.ok(Array.isArray(listeners));
assert.strictEqual(listeners.length, 0);
}
{
var ee = new EventEmitter();
var listener3 = common.mustCall(function() {
ee.removeListener('hello', listener4);
}, 2);
var listener4 = common.mustCall();
ee.on('hello', listener3);
ee.on('hello', listener4);
// listener4 will still be called although it is removed by listener 3.
ee.emit('hello');
// This is so because the interal listener array at time of emit
// was [listener3,listener4]
// Interal listener array [listener3]
ee.emit('hello');
}
{
var ee = new EventEmitter();
ee.once('hello', listener1);
ee.on('removeListener', common.mustCall(function(eventName, listener) {
assert.strictEqual(eventName, 'hello');
assert.strictEqual(listener, listener1);
}));
ee.emit('hello');
}
{
var ee = new EventEmitter();
assert.strictEqual(ee, ee.removeListener('foo', function() {}));
}
// Verify that the removed listener must be a function
assert.throws(function() {
var ee = new EventEmitter();
ee.removeListener('foo', null);
}, /^TypeError: The "listener" argument must be of type Function\. Received type object$/);
{
var ee = new EventEmitter();
var listener = function() {};
ee._events = undefined;
var e = ee.removeListener('foo', listener);
assert.strictEqual(e, ee);
}
{
var ee = new EventEmitter();
ee.on('foo', listener1);
ee.on('foo', listener2);
var listeners = ee.listeners('foo');
assert.ok(Array.isArray(listeners));
assert.strictEqual(listeners.length, 2);
assert.strictEqual(listeners[0], listener1);
assert.strictEqual(listeners[1], listener2);
ee.removeListener('foo', listener1);
assert.strictEqual(ee._events.foo, listener2);
ee.on('foo', listener1);
listeners = ee.listeners('foo');
assert.ok(Array.isArray(listeners));
assert.strictEqual(listeners.length, 2);
assert.strictEqual(listeners[0], listener2);
assert.strictEqual(listeners[1], listener1);
ee.removeListener('foo', listener1);
assert.strictEqual(ee._events.foo, listener2);
}
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