Improve start/stop test coverage

[uuf6429]

Relates to #10.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.44%. Comparing base (ea2ee82) to head (33f9f07).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #37      +/-   ##
============================================
+ Coverage     81.76%   82.44%   +0.68%     
- Complexity      191      192       +1     
============================================
  Files             1        1              
  Lines           488      490       +2     
============================================
+ Hits            399      404       +5     
+ Misses           89       86       -3     

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