test(cli/unstable): rewrite Spinner tests using stub

[timreichen]

closes #6157
closes #6211

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.51%. Comparing base (7480f35) to head (b5ef858).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6254      +/-   ##
==========================================
- Coverage   96.52%   96.51%   -0.02%     
==========================================
  Files         535      536       +1     
  Lines       41030    41101      +71     
  Branches     6141     6155      +14     
==========================================
+ Hits        39606    39667      +61     
- Misses       1382     1392      +10     
  Partials       42       42              

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[kt3k]

LGTM. Nice work! Thanks

I also updated the test case. Now they are surrounded by try block and restore is called in finally block (By this change, restore is always called even when there's assertion errors in the middle)