Tests: improve SYNC coverage

[erlend-aasland]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.10%. Comparing base (5004363) to head (b2f05e7).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #531      +/-   ##
==========================================
+ Coverage   70.94%   71.10%   +0.16%     
==========================================
  Files          26       26              
  Lines        3111     3111              
  Branches      526      526              
==========================================
+ Hits         2207     2212       +5     
+ Misses        776      769       -7     
- Partials      128      130       +2     

see 1 file with indirect coverage changes