Increase test coverage

[dominikschulz]

No description provided.

[codecov]

Codecov Report

Merging #575 into master will increase coverage by 11.95%.
The diff coverage is 98.33%.

@@             Coverage Diff             @@
##           master     #575       +/-   ##
===========================================
+ Coverage    28.9%   40.86%   +11.95%     
===========================================
  Files         110      111        +1     
  Lines        6542     6544        +2     
===========================================
+ Hits         1891     2674      +783     
+ Misses       4287     3489      -798     
- Partials      364      381       +17

Impacted Files	Coverage Δ
utils/notify/notify_linux.go	27.27% <ø> (+26.82%)	⬆️
store/secret/secret.go	82.3% <50%> (+25.54%)	⬆️
utils/notify/icon.go	98.62% <98.62%> (ø)
store/sub/store.go	43.39% <0%> (+1.88%)	⬆️
store/sub/recipients.go	47.51% <0%> (+2.12%)	⬆️
utils/tree/simple/folder.go	84.67% <0%> (+3.22%)	⬆️
utils/ctxutil/ctxutil.go	100% <0%> (+15.58%)	⬆️
utils/fsutil/tempdir_linux.go	75% <0%> (+25%)	⬆️
... and 4 more

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