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denoland-deno/cli/tests/node_compat/test/parallel/test-event-emitter-prepend.js
Yoshiya Hinosawa 6915a9b7a7
test(ext/node): more node compat tests (#17827)
This PR adds the remaining ~650 Node.js compat test cases from std/node.

Among these 650 cases, about 130 cases are now failing. These failing
cases are prefixed with `TODO:` in `tests/node_compat/config.json`.
These will be addressed in later PRs.
2023-02-20 16:35:04 +01:00

50 lines
1.4 KiB
JavaScript

// deno-fmt-ignore-file
// deno-lint-ignore-file
// Copyright Joyent and Node contributors. All rights reserved. MIT license.
// Taken from Node 16.13.0
// This file is automatically generated by "node/_tools/setup.ts". Do not modify this file manually
'use strict';
const common = require('../common');
const EventEmitter = require('events');
const assert = require('assert');
const myEE = new EventEmitter();
let m = 0;
// This one comes last.
myEE.on('foo', common.mustCall(() => assert.strictEqual(m, 2)));
// This one comes second.
myEE.prependListener('foo', common.mustCall(() => assert.strictEqual(m++, 1)));
// This one comes first.
myEE.prependOnceListener('foo',
common.mustCall(() => assert.strictEqual(m++, 0)));
myEE.emit('foo');
// Test fallback if prependListener is undefined.
const stream = require('stream');
delete EventEmitter.prototype.prependListener;
function Writable() {
this.writable = true;
stream.Stream.call(this);
}
Object.setPrototypeOf(Writable.prototype, stream.Stream.prototype);
Object.setPrototypeOf(Writable, stream.Stream);
function Readable() {
this.readable = true;
stream.Stream.call(this);
}
Object.setPrototypeOf(Readable.prototype, stream.Stream.prototype);
Object.setPrototypeOf(Readable, stream.Stream);
// FIXME(bartlomieju):
// const w = new Writable();
// const r = new Readable();
// r.pipe(w);