# Automated Performance Tests

[Requires Production Plan](https://www.blackfire.io/pricing)

[Writing scenarios](https://www.youtube-nocookie.com/embed/ywxzuaj6nxQ?rel=0&showinfo=0&modestbranding=1&autoplay=0)

Your application's critical user journeys can be protected by assessing their performance regularly.

Blackfire provides an easy way to describe custom scenarios and when evaluated, Blackfire will trigger a profile for every URL described in all the steps and scenarios.

As for all profiles, the matching assertions will be evaluated, and all the results will be grouped in a convenient report.

Scenarios are written in `.bkf` files using the Blackfire Player DSL:

```blackfire
name "Website Pages Check"

scenario
    visit url('/pricing')
        name 'Pricing page'
        expect status_code() == 200
        assert metrics.sql.queries.count < 10

    visit url('/docs/introduction')
        name 'Documentation'
        expect status_code() == 200
```

An [online validator](https://blackfire.io/validator) can help you validate the syntax of your `.bkf` files.

> **Note**
>
> [Explore the full Player DSL](../../builds-cookbooks/player), including reusable blocks, variables, form submission, and more.