Conditionally skip test on MacOS.

[tobiasraabe]

Related to #377.

[codecov]

Codecov Report

Merging #378 (8dbeb8b) into main (802ccd2) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 8dbeb8b differs from pull request most recent head d3ad3c7. Consider uploading reports for the commit d3ad3c7 to get more accurate results

@@           Coverage Diff           @@
##             main     #378   +/-   ##
=======================================
  Coverage   96.08%   96.08%           
=======================================
  Files          93       93           
  Lines        7643     7645    +2     
=======================================
+ Hits         7344     7346    +2     
  Misses        299      299           

Flag	Coverage Δ
end_to_end	83.25% <100.00%> (+<0.01%)	⬆️
integration	41.34% <100.00%> (+0.01%)	⬆️
unit	66.29% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
tests/test_live.py	100.00% <100.00%> (ø)