update pytest for plot_gif

[chenyangkang]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.55%. Comparing base (f5da089) to head (dc0d31a).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
- Coverage   90.57%   90.55%   -0.03%     
==========================================
  Files          40       40              
  Lines        3587     3589       +2     
==========================================
+ Hits         3249     3250       +1     
- Misses        338      339       +1     

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