Symfony test bundle

This repository contains an ultra slim bundle. It serves as a basis for practicing certain Symfony bundle development skills.

By completing the tasks below

Tasks

1. Add service configuration for MessageBuilder: the MessageBuilder does not autowire out-of-the-box.

   1. Why?
   2. Can you solve it?

2. Some variables need to be different on each environment (think of database credentials for example). This is most commonly done by using environment variables.

   1. Now that MessageBuilder autowires, can you make it so that it accepts configuration from an environment variable when implemented in an app?

3. Every bundle should have unit tests, ensuring the functionality provided is proper and works. This is especially important for libraries or projects that are under constant development by multiple people.

   1. Where do you put a unit test in a bundle?
   2. What test would you write for this bundle?