Fix tests

[talonchandler]

The tests on #297 are failing, and the issue seems to be related to DISPLAY XAUTHORITY, which is a tox setting I picked up from the napari plugin cookiecutter.

This PR removes this line and the tests seem to pass (with this change alone, and in the #297 branch).

These docs make me think this setting is for testing GUI elements, which we currently aren't doing in GH actions.

@ziw-liu, do you think this is safe to merge?

Run GabrielBB/xvfb-action@v[1](https://github.com/mehta-lab/recOrder/pull/297/checks#step:7:1)
  with:
    run: python -m tox
  env:
    pythonLocation: /Users/runner/hostedtoolcache/Python/[3](https://github.com/mehta-lab/recOrder/pull/297/checks#step:7:3).8.15/x6[4](https://github.com/mehta-lab/recOrder/pull/297/checks#step:7:4)
    PLATFORM: macos-latest
/Users/runner/hostedtoolcache/Python/3.8.1[5](https://github.com/mehta-lab/recOrder/pull/297/checks#step:7:5)/x[6](https://github.com/mehta-lab/recOrder/pull/297/checks#step:7:6)4/bin/python -m tox
py3[8](https://github.com/mehta-lab/recOrder/pull/297/checks#step:7:9)-macos: failed with pass_env values cannot contain whitespace, use comma to have multiple values in a single line, invalid values found 'DISPLAY XAUTHORITY'
  py38-macos: FAIL code 1 (0.01 seconds)
  evaluation failed :( (0.43 seconds)
Error: The process '/Users/runner/hostedtoolcache/Python/3.8.15/x64/bin/python' failed with exit code 1

[deprecated-napari-hub-preview-bot]

Preview page for your plugin is ready here:
https://preview.napari-hub.org/mehta-lab/recOrder/302
Updated: 2023-01-05T04:37:46.993127

[ziw-liu]

These docs make me think this setting is for testing GUI elements, which we currently aren't doing in GH actions.

You are right: the environment variables DISPLAY and XAUTHORITY are related to having a X-session running on the Linux workers.

Actually napari had the same issue recently: napari/napari#5441

[ziw-liu]

Seems like copying the fix in napari/napari@7fee6f4 works. Functionally the same since we're not using the feature yet.

[talonchandler]

Great find @ziw-liu!

Ready to merge from my perspective.

[codecov-commenter]

Codecov Report

Merging #302 (37cadc7) into main (655a764) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main    #302   +/-   ##
=====================================
  Coverage   4.27%   4.27%           
=====================================
  Files         23      23           
  Lines       5102    5102           
=====================================
  Hits         218     218           
  Misses      4884    4884           

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