Write failing test images to file.

[Niil Öhlin]

Or at least output the offending test image somewhere.

[Oscar Antonio Duran Grillo]

Hey @niilohlin, actually the library is showing the diff image and the errored one, you can see it in the Xcode report

I avoided the writing to the file cause it's not a necessary file if you have Xcode, do you need the output file in any case?

thanks!

[Niil Öhlin]

I intended to use the offending file in our CI environment.

[Oscar Antonio Duran Grillo]

mmm yeah, for CI make sense, I'll add that image to the output files then