node/test/simple/test-event-emitter-remove-all-listeners.js

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//
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var common = require('../common');
var assert = require('assert');
var events = require('events');


function listener() {}

var e1 = new events.EventEmitter();
e1.on('foo', listener);
e1.on('bar', listener);
e1.removeAllListeners('foo');
assert.deepEqual([], e1.listeners('foo'));
assert.deepEqual([listener], e1.listeners('bar'));


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