How to Write a Test Using Haskell

The editor was built with Haskell, all this is written in Haskell. It definitely doesn't compile anymore. I tried, but I like it's a mess. We can maybe talk about that later. But anyway, so this editor, I started exploring property-based testing. That's where we started. One of the things which I like about QuickCheck is that it was actually originated as something to help mark students' homework assignments.