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/home/yanggyein/yanggyein/yang_ai/node_modules/events/tests/symbols.js
'use strict'; var common = require('./common'); var EventEmitter = require('../'); var assert = require('assert'); var ee = new EventEmitter(); var foo = Symbol('foo'); var listener = common.mustCall(); ee.on(foo, listener); assert.strictEqual(ee.listeners(foo).length, 1); assert.strictEqual(ee.listeners(foo)[0], listener); ee.emit(foo); ee.removeAllListeners(); assert.strictEqual(ee.listeners(foo).length, 0); ee.on(foo, listener); assert.strictEqual(ee.listeners(foo).length, 1); assert.strictEqual(ee.listeners(foo)[0], listener); ee.removeListener(foo, listener); assert.strictEqual(ee.listeners(foo).length, 0);