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Prerequisites
To make use of Behat, we first have to install it on our system. Read more about Behat installation in official documentation.
Installing Behat via Composer
A Composer package for Behat is available. A dependency can be added to composer.json using Composer Support in PhpStorm (recommended) or manually.
Use the Composer | Add dependency... context menu on your project and install behat/behat package:
Installing Behat with Phar package
You can either download behat.phar package from Behat GitHub repository, or install it in Settings | PHP | Behat | Download behat.phar from...