Issue to generate correctly html repport while using xdist options

[ClementLaplace]

Hello I'm using the mpl packages to enable the comparison for hundread of images. This process takes a while in sequential mode
so I have decided to use the xdist plugin in pytest. When I'm combining mpl and xdist plugins it works well and I have my tests that are really speed up. However I wanted to generate this html report and unfortunately it does not work, I get empty pages (see image bellow) with no files shown, even if in the result directory I get the directories containing images of basefile and results.

I have done this command line

pytest -n 6 --mpl --mpl-baseline-path=baseline --mpl-results-path=results --mpl-generate-summary=html,json --mpl-use-full-test-name

Here is my informations about my packages bellow

platform linux -- Python 3.12.9, pytest-8.3.4, pluggy-1.5.0
Matplotlib: 3.10.0
Freetype: 2.12.1
rootdir:  /home/claplace/project/pysat
plugins: mpl-0.17.0, xdist-3.6.1, mock-3.14.0

If I remove the -n 6 option which is from xdist to enable to parralelise test on 6 cores the html repport is working well.
So I wanted to know if there is a way to handle the html repport generation correctly while using xdist ?

[ConorMacBride]

Hi @ClementLaplace, unfortunately reports cannot be generated correctly when using pytest-xdist. I looked into this before but couldn't find an obvious simple fix, but I'm sure a fix exists! #136

[ClementLaplace]

@ConorMacBride thanks for your awnser and your work on this plugin.