"Christopher M. Miles" <numbch...@gmail.com> writes:

>> I think that the best we can do in this situation is mocking
>> `create-image' in batch mode to return non-nil using `cl-letf'.
> I checked the `create-image' in image.el source code, don't know how to
> mocking this. I have no experience and idea about this. I also searched
> org testing. Have not found similar situations.
> If you have idea how to write this test, I suggest pass this word to
> you. What do you think?

I imagine something like

;; Mock `create-image' to work noninteractively.
(cl-letf (((symbol-function 'create-image)
           (lambda (&rest _)
             `(image :type "dummy" :data "dummy"))))
  <your test code here>)

Ihor Radchenko // yantar92,
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