On 2017-02-13, at 20:00, John Wiegley <jwiegley@gmail.com> wrote:

>>>>>> Dmitry Gutov <dgutov@yandex.ru> writes:
>
>> I'd rather interpret John as being entirely serious. :) Tests are good.
>
> Dmitry is quite right; any patch that comes with a battery of new tests is
> already a huge plus in my book.

Thanks - as I said, I was a bit unsure;-).

Here's my proposed contribution, formatted as two patches.  The first
one introduces the testing machinery; the second one introduces
mark-defun and its tests.

WDYT?

-- 
Marcin Borkowski