Fig test slice

[ruaridhg]

Towards #8

• Added baseline folder with test images to gitignore
• test_slice used 3D brain data from ski image
• needed to change backend_qt5agg to backend_qtagg (not sure if this is something we want in the base.py since the change was just for testing)

[dstansby]

The test is now skipped during testing, and it shouldn't be skipped. (e.g. see https://github.com/matplotlib/napari-matplotlib/actions/runs/4981454254/jobs/8915726820?pr=113#step:7:42)

I suspect this is because there aren't any baseline images? Instead of gitignoring the test image folder, I think we decided to upload the test images to the repo, so the gitignore needs changing, and the baseline test images adding.

[ruaridhg]

The test is now skipped during testing, and it shouldn't be skipped. (e.g. see https://github.com/matplotlib/napari-matplotlib/actions/runs/4981454254/jobs/8915726820?pr=113#step:7:42)

I suspect this is because there aren't any baseline images? Instead of gitignoring the test image folder, I think we decided to upload the test images to the repo, so the gitignore needs changing, and the baseline test images adding.

Locally it seems to skip the first time when creating the baseline image and then it works as expected the 2nd time, but clearly is not the case for tox so will investigate further. Yes, I remember now and I've found a 3D image that works then makes sense to remove from gitignore.

[dstansby]

👍 - I think the two things that need doing then are:

• Commit the test images to the git repository
• Make sure the test images are available to tox. It might be you need to copy them from the root of the repostiory to the tox environment with a command in the tox file that looks like:
  cp {toxinidir}/path/to/figures/in/repo {envdir}/path/to/figures/in/repo
  (I got the tox variables in curly brackets from https://tox.wiki/en/latest/config.html)

[dstansby]

The test is still being skipped, I'm guessing because it still isn't finding the test image?

[ruaridhg]

The test is still being skipped, I'm guessing because it still isn't finding the test image?

Yes, I've not got it quite working yet as using tox locally, the test_slice is being skipped due to Unable to download data/brain.tiff so I need to locate that and copy it over to tox

[ruaridhg]

@dstansby Turns out python -c 'from skimage import data; data.brain()' was the command needed to make the data available to tox. Should be fine to merge now, however Read the Docs build failed