Add recipe for AVA & Puppeteer (#1913)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>
Co-authored-by: Mark Wubben <mark@novemberborn.net>

docs/recipes/puppeteer.md

@@ -0,0 +1,53 @@
+# Testing web apps using Puppeteer
+
+## Dependencies
+
+- [Puppeteer](https://github.com/GoogleChrome/puppeteer): `npm install --save-dev puppeteer`
+
+## Setup
+
+The first step is setting up a helper to configure the environment:
+
+`./test/helpers/withPage.js`
+
+```js
+import puppeteer from 'puppeteer';
+
+export default async function withPage(t, run) {
+	const browser = await puppeteer.launch();
+	const page = await browser.newPage();
+	try {
+		await run(t, page);
+	} finally {
+		await page.close();
+		await browser.close();
+	}
+}
+```
+
+## Usage example
+
+`./test/main.js`
+
+```js
+import test from 'ava';
+import withPage from './helpers/withPage';
+
+const url = 'https://google.com';
+
+test('page title should contain "Google"', withPage, async (t, page) => {
+	await page.goto(url);
+	t.true((await page.title()).includes('Google'));
+});
+
+test('page should contain an element with `#hplogo` selector', withPage, async (t, page) => {
+	await page.goto(url);
+	t.not(await page.$('#hplogo'), null);
+});
+
+test('search form should match the snapshot', withPage, async (t, page) => {
+	await page.goto(url);
+	const innerHTML = await page.evaluate(form => form.innerHTML, await page.$('#searchform'));
+	t.snapshot(innerHTML);
+});
+```

readme.md

@@ -1219,6 +1219,7 @@ It's the [Andromeda galaxy](https://simple.wikipedia.org/wiki/Andromeda_galaxy).
 - [Debugging tests with WebStorm](docs/recipes/debugging-with-webstorm.md)
 - [Precompiling source files with webpack](docs/recipes/precompiling-with-webpack.md)
 - [Isolated MongoDB integration tests](docs/recipes/isolated-mongodb-integration-tests.md)
+- [Testing web apps using Puppeteer](docs/recipes/puppeteer.md)
 
 ## Support