Implements tests #54
Description
- Dependency injection (parameters and services drived by configuration)
- Helper (each shortcut method will correctly add what is expected in the correct FlashBag)
- SessionHandler (what is in session is handled as well to be transformed into some template)
- Listener (on kernel.response, we correctly inject the templates into the page to show alerts ex. https://github.com/symfony/web-profiler-bundle/blob/2.8/Tests/EventListener/WebDebugToolbarListenerTest.php)
- TwigExtension (we can render alerts directly in twig thanks to this extension)