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- README.md
- duplexpair.js

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`‎test/common/README.md‎`

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+9Lines changed: 9 additions & 0 deletions

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Original file line number	Diff line number	Diff line change
`@@ -5,6 +5,7 @@ This directory contains modules used to test the Node.js implementation.`
`5`	`5`	`## Table of Contents`
`6`	`6`
`7`	`7`	`* [Common module API](#common-module-api)`
	`8`	`+* [Duplex pair helper](#duplex-pair-helper)`
`8`	`9`	`* [WPT module](#wpt-module)`
`9`	`10`
`10`	`11`	`## Common Module API`
@@ -318,6 +319,14 @@ Decrements the `Countdown` counter.
`318`	`319`	Specifies the remaining number of times `Countdown.prototype.dec()` must be
`319`	`320`	`called before the callback is invoked.`
`320`	`321`
	`322`	`+## Duplex pair helper`
	`323`	`+`
	`324`	+The `common/duplexpair` module exports a single function `makeDuplexPair`,
	`325`	+which returns an object `{ clientSide, serverSide }` where each side is a
	`326`	+`Duplex` stream connected to the other side.
	`327`	`+`
	`328`	`+There is no difference between client or server side beyond their names.`
	`329`	`+`
`321`	`330`	`## Fixtures Module`
`322`	`331`
`323`	`332`	The `common/fixtures` module provides convenience methods for working with

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`‎test/common/duplexpair.js‎`

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+45Lines changed: 45 additions & 0 deletions

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`@@ -0,0 +1,45 @@`
	`1`	`+/* eslint-disable required-modules */`
	`2`	`+'use strict';`
	`3`	`+const { Duplex } = require('stream');`
	`4`	`+const assert = require('assert');`
	`5`	`+`
	`6`	`+const kCallback = Symbol('Callback');`
	`7`	`+const kOtherSide = Symbol('Other');`
	`8`	`+`
	`9`	`+class DuplexSocket extends Duplex {`
	`10`	`+ constructor() {`
	`11`	`+ super();`
	`12`	`+ this[kCallback] = null;`
	`13`	`+ this[kOtherSide] = null;`
	`14`	`+ }`
	`15`	`+`
	`16`	`+ _read() {`
	`17`	`+ const callback = this[kCallback];`
	`18`	`+ if (callback) {`
	`19`	`+ this[kCallback] = null;`
	`20`	`+ callback();`
	`21`	`+ }`
	`22`	`+ }`
	`23`	`+`
	`24`	`+ _write(chunk, encoding, callback) {`
	`25`	`+ assert.notStrictEqual(this[kOtherSide], null);`
	`26`	`+ assert.strictEqual(this[kOtherSide][kCallback], null);`
	`27`	`+ this[kOtherSide][kCallback] = callback;`
	`28`	`+ this[kOtherSide].push(chunk);`
	`29`	`+ }`
	`30`	`+`
	`31`	`+ _final(callback) {`
	`32`	`+ this[kOtherSide].on('end', callback);`
	`33`	`+ this[kOtherSide].push(null);`
	`34`	`+ }`
	`35`	`+}`
	`36`	`+`
	`37`	`+function makeDuplexPair() {`
	`38`	`+ const clientSide = new DuplexSocket();`
	`39`	`+ const serverSide = new DuplexSocket();`
	`40`	`+ clientSide[kOtherSide] = serverSide;`
	`41`	`+ serverSide[kOtherSide] = clientSide;`
	`42`	`+ return { clientSide, serverSide };`
	`43`	`+}`
	`44`	`+`
	`45`	`+module.exports = makeDuplexPair;`

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