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docs: Avoid third-party with Network API (#21629)

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docs: Avoid third-party with Network API

On the [Avoid testing third-party
dependencies](https://playwright.dev/docs/best-practices#avoid-testing-third-party-dependencies).
Instead of only inform about third-party, this sesison is a good place
to share about Network API. Guiding them in not only inform about
avoiding third-party, but also explaining how to deal with this use
case.

Signed-off-by: Jonatas Emidio <jonatasemidio@gmail.com>
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Jonatas Emidio 2023-03-14 18:40:03 +00:00 committed by GitHub
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10
docs/src/best-practices-js.md
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@ -58,6 +58,16 @@ await page.getByRole('link', { name: 'next page' }).click();
Only test what you control. Don't try to test links to external sites or third party servers that you do not control. Not only is it time consuming and can slow down your tests but also you can not control the content of the page you are linking to, or if there are cookie banners or overlay pages or anything else that might cause your test to fail.
Instead, use the [Playwright Network API](/network.md#handle-requests) and guarantee the response needed.
```js
await page.route('**/api/fetch_data_third_party_dependency', route => route.fulfill({
status: 200,
body: testData,
}));
await page.goto('https://example.com');
```
### Testing with a database
If working with a database then make sure you control the data. Test against a staging environment and make sure it doesn't change. For visual regression tests make sure the operating system and browser versions are the same.