mirror of https://github.com/lukechilds/node.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
49 lines
1.6 KiB
49 lines
1.6 KiB
'use strict';
|
|
const common = require('../common');
|
|
const assert = require('assert');
|
|
const { Readable, Writable, Duplex, Transform } = require('stream');
|
|
|
|
const readable = new Readable({ read() {} });
|
|
const writable = new Writable({ write() {} });
|
|
const duplex = new Duplex({ read() {}, write() {} });
|
|
const transform = new Transform({ transform() {} });
|
|
|
|
assert.ok(readable instanceof Readable);
|
|
assert.ok(!(writable instanceof Readable));
|
|
assert.ok(duplex instanceof Readable);
|
|
assert.ok(transform instanceof Readable);
|
|
|
|
assert.ok(!(readable instanceof Writable));
|
|
assert.ok(writable instanceof Writable);
|
|
assert.ok(duplex instanceof Writable);
|
|
assert.ok(transform instanceof Writable);
|
|
|
|
assert.ok(!(readable instanceof Duplex));
|
|
assert.ok(!(writable instanceof Duplex));
|
|
assert.ok(duplex instanceof Duplex);
|
|
assert.ok(transform instanceof Duplex);
|
|
|
|
assert.ok(!(readable instanceof Transform));
|
|
assert.ok(!(writable instanceof Transform));
|
|
assert.ok(!(duplex instanceof Transform));
|
|
assert.ok(transform instanceof Transform);
|
|
|
|
assert.ok(!(null instanceof Writable));
|
|
assert.ok(!(undefined instanceof Writable));
|
|
|
|
// Simple inheritance check for `Writable` works fine in a subclass constructor.
|
|
function CustomWritable() {
|
|
assert.ok(this instanceof Writable, 'inherits from Writable');
|
|
assert.ok(this instanceof CustomWritable, 'inherits from CustomWritable');
|
|
}
|
|
|
|
Object.setPrototypeOf(CustomWritable, Writable);
|
|
Object.setPrototypeOf(CustomWritable.prototype, Writable.prototype);
|
|
|
|
new CustomWritable();
|
|
|
|
assert.throws(CustomWritable,
|
|
common.expectsError({
|
|
code: 'ERR_ASSERTION',
|
|
message: /^inherits from Writable$/
|
|
}));
|
|
|