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 links to this demo.

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?

Start with the AssertJ Swing input guide and its one-minute quick-start, then inspect how the documented application.start() flow is used. Determine whether a runnable example can be added and separately assess the request for returning the root frame; done should include an executable example and clearly documented API behavior.