Improve test coverage

[dominikschulz]

No description provided.

[codecov]

Codecov Report

Merging #570 into master will increase coverage by 2.48%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #570      +/-   ##
==========================================
+ Coverage   24.03%   26.52%   +2.48%     
==========================================
  Files         110      110              
  Lines        6515     6515              
==========================================
+ Hits         1566     1728     +162     
+ Misses       4638     4464     -174     
- Partials      311      323      +12

Impacted Files	Coverage Δ
config/store_config.go	79.59% <100%> (+79.59%)	⬆️
utils/fsutil/fsutil.go	58.33% <0%> (+3.33%)	⬆️
config/io.go	67.14% <0%> (+32.85%)	⬆️
utils/ctxutil/ctxutil.go	84.41% <0%> (+35.71%)	⬆️
config/location.go	81.25% <0%> (+59.37%)	⬆️
config/config.go	93.54% <0%> (+77.41%)	⬆️

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