Many years ago, I was using typing trainer website that had a handful of public domain books available to train on as part of the end-of-course materials. I thought this was really neat, but I ran out of content pretty quickly and lamented the fact that there was nothing else available. Why couldn’t you just choose any of the books that were in the public domain? The framework was already there, surely it wouldn’t be difficult to implement? I was perplexed by such an obvious oversight and missed opportunity.
Well, today I stumbled upon the exact thing I had wanted to have back then and just wanted to share.
As far as typing tests/training goes, I tend to be much more of a fan of something like monkeytype, which offers a much nicer and more customizable interface, real time feedback on speed and accuracy, and has a quotes mode that essentially is what you are looking for. Though you can copy/paste a large chunk of text in custom mode if you prefer to actually type an entire chapter of a book.
Just thought I would provide another tool as an alternative