Allows to declare own services inside Behat container without writing an extension.
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Install it: $ composer require friends-of-behat/service-container-extension --dev 
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Enable this extension and configure Behat to use it: # behat.yml default: # ... extensions: FriendsOfBehat\ServiceContainerExtension: imports: - "features/bootstrap/config/services.xml" - "features/bootstrap/config/services.yml" - "features/bootstrap/config/services.php" 
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Write services files definitions: <!-- features/bootstrap/config/services.xml --> <?xml version="1.0" encoding="UTF-8" ?> <container xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://symfony.com/schema/dic/services"> <services> <service id="acme.my_service" class="Acme\MyService" /> </services> </container> # features/bootstrap/config/services.yml services: acme.my_service: class: Acme\MyService // features/bootstrap/config/services.php use Symfony\Component\DependencyInjection\Definition; $container->setDefinition('acme.my_service', new Definition(\Acme\MyService::class));