So, I put together this little test track, which has skidpads, steep mountain roads, angled banks, brake areas and a lot more.
This is the layout:

This is what the main test area looks like:

And here's a video that should pretty much cover everything.
(Sorry about the jerky footage, but that's the best I could do with the in-game camera...)
It's available here: http://www.kronzky.info/ets2/testtrack