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files >> //opt/alt/alt-nodejs19/root/lib/node_modules/npm/node_modules.bundled/events/tests/once.js
// 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 e = new EventEmitter(); e.once('hello', common.mustCall()); e.emit('hello', 'a', 'b'); e.emit('hello', 'a', 'b'); e.emit('hello', 'a', 'b'); e.emit('hello', 'a', 'b'); function remove() { assert.fail('once->foo should not be emitted'); } e.once('foo', remove); e.removeListener('foo', remove); e.emit('foo'); e.once('e', common.mustCall(function() { e.emit('e'); })); e.once('e', common.mustCall()); e.emit('e'); // Verify that the listener must be a function assert.throws(function() { var ee = new EventEmitter(); ee.once('foo', null); }, /^TypeError: The "listener" argument must be of type Function. Received type object$/); { // once() has different code paths based on the number of arguments being // emitted. Verify that all of the cases are covered. var maxArgs = 4; for (var i = 0; i <= maxArgs; ++i) { var ee = new EventEmitter(); var args = ['foo']; for (var j = 0; j < i; ++j) args.push(j); ee.once('foo', common.mustCall(function() { var params = Array.prototype.slice.call(arguments); var restArgs = args.slice(1); assert.ok(Array.isArray(params)); assert.strictEqual(params.length, restArgs.length); for (var index = 0; index < params.length; index++) { var param = params[index]; assert.strictEqual(param, restArgs[index]); } })); EventEmitter.prototype.emit.apply(ee, args); } }
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