Is there a visual, concise test page for Bootstrap 4?

Created by: arechsteiner

I think I remember a test page for Bootstrap 2, where some of the core components were put on a single page in order to quickly assess whether they all look good. I can't find that page anymore though.

Is it still around and if not, how do Bootstrap developers test that their changes have not affected any of the components?

I'm thinking specifically in terms of rebuilding Bootstrap with a different set of variables in _variables.scss (or _custom.scss). Except for scrolling through the docs, I don't see how someone could quickly verify that everything works as it should.

If such a page or set of pages does not exist, would there be demand that I create them and submit a pull request?