during my work with context I wrote a bunch of fewliners mainly to test
how to do things. When there change from mkii to mkiv occured many of
my mini-tests failed and later with the growing of mkiv restartet to
work - some just without adaption.. some with some adjustment to a new
syntax.

I realize that they have the same functionality like unit-tests -
just instead of comparing classes and variables - a pdf-output is
visually compared.

So I like to suggest to introduce unit tests for context. It would

       a) increase the quality of context as it makes the
       testing easier for the developer

       b) it also would be a great source of minihowtos for learning
       context.

Before I write my technical ideas about this I would like to know what
are you thinking about this idea?