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`‎doc/guides/writing-tests.md‎`

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Original file line number	Diff line number	Diff line change
`@@ -133,11 +133,15 @@ platforms.`
`133`	`133`
`134`	`134`	`### The common API`
`135`	`135`
`136`		-Make use of the helpers from the `common` module as much as possible.
	`136`	+Make use of the helpers from the `common` module as much as possible. Please refer
	`137`	`+to the [common file documentation](https://github.com/nodejs/node/tree/master/test/common)`
	`138`	`+for the full details of the helpers.`
`137`	`139`
`138`		-One interesting case is `common.mustCall`. The use of `common.mustCall` may
`139`		`-avoid the use of extra variables and the corresponding assertions. Let's explain`
`140`		`-this with a real test from the test suite.`
	`140`	`+#### common.mustCall`
	`141`	`+`
	`142`	+One interesting case is `common.mustCall`. The use of `common.mustCall` may avoid
	`143`	`+the use of extra variables and the corresponding assertions. Let's explain this`
	`144`	`+with a real test from the test suite.`
`141`	`145`
`142`	`146`	```javascript
`143`	`147`	`'use strict';`
`@@ -189,6 +193,23 @@ const server = http.createServer(common.mustCall(function(req, res) {`
`189`	`193`	`});`
`190`	`194`
`191`	`195`	```
	`196`	`+#### Countdown Module`
	`197`	`+`
	`198`	`+The common [Countdown module](https://github.com/nodejs/node/tree/master/test/common#countdown-module) provides a simple countdown mechanism for tests that`
	`199`	`+require a particular action to be taken after a given number of completed tasks`
	`200`	`+(for instance, shutting down an HTTP server after a specific number of requests).`
	`201`	`+`
	`202`	+```javascript
	`203`	`+const Countdown = require('../common/countdown');`
	`204`	`+`
	`205`	`+const countdown = new Countdown(2, function() {`
	`206`	`+ console.log('.');`
	`207`	`+});`
	`208`	`+`
	`209`	`+countdown.dec();`
	`210`	`+countdown.dec(); // The countdown callback will be invoked now.`
	`211`	+```
	`212`	`+`
`192`	`213`
`193`	`214`	`### Flags`
`194`	`215`

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