Re: Arranging for windows of particular dimensions in xdisp-tests

[Jim Porter]

On 1/30/2024 10:26 PM, Po Lu wrote:
> I've just fixed several hangs in redisplay arising from `display'
> objects' being denied sufficient space by a line or wrap prefix, and
> consequently continuation lines being produced in an endless cycle
> inside move_it_to and display_line.  Needless to say, tests for such
> bugs require that the windows where they execute be set to a particular
> size, which, considering that ERT tests are expected to run in both
> interactive sessions and in the initial frame, appears to be impossible.
>
> Ideas?  Thanks in advance.

The easiest might be to skip the test when it can't be run (or fail the 
test if you want to be noisier about it).

I suppose you could also spawn a second, entirely-separate Emacs 
instance to test this part, although I'm not sure I'd *recommend* doing 
that. In theory though, you could start up that second Emacs and pass it 
a script to run, exiting with zero if the test succeeded.