Where is the source code used in the examples, please?

### What I found/tried:
I am new to AssertJ. I'm reading https://joel-costigliola.github.io/assertj/assertj-swing-input.html

There's a few lines of code pointing me in a good direction. They assume I already know how to import everything needed. The one minute quick-start doesn't have a runable demo.

I looked in various sub-folders for examples with no luck.

### What I expect:
A working example I can run locally to see these things in action for myself? Same way a "how to use [swing feature x]" would have run-able source code. Example, [JButton](https://docs.oracle.com/javase/tutorial/uiswing/components/button.html) links to [this demo](https://docs.oracle.com/javase/tutorial/displayCode.html?code=https://docs.oracle.com/javase/tutorial/uiswing/examples/components/ButtonDemoProject/src/components/ButtonDemo.java).

### separately:
the quick-start code assumes I know the title of my frame. As my app is multilingual I can't be sure what translation is running or the name of the frame around the panel I want to test. Can application.start() return the root frame?

Commencez par le guide de prise en main d’AssertJ Swing et son démarrage rapide d’une minute, puis examinez comment le flux documenté de application.start() est utilisé. Déterminez si un exemple exécutable peut être ajouté et évaluez séparément la demande de retourner la fenêtre racine ; le travail sera considéré comme terminé lorsqu’il inclura un exemple exécutable et un comportement d’API clairement documenté.

Rédigé par le modèle d'indexation à partir du texte de l'issue.