tests: more coverage

[jkroepke]

Signed-off-by: Jan-Otto Kröpke mail@jkroepke.deWhat this PR does / why we need it:

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

Particularly user-facing changes:

PR Readiness Checklist:

Complete these before marking the PR as ready to review:

• The PR title has a summary of the changes
• The PR body has a summary to reflect any significant (and particularly user-facing) changes introduced by this PR

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (034cc29) 72.99% compared to head (e61801b) 74.32%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
+ Coverage   72.99%   74.32%   +1.32%     
==========================================
  Files          19       20       +1     
  Lines        1248     1293      +45     
==========================================
+ Hits          911      961      +50     
+ Misses        294      288       -6     
- Partials       43       44       +1     

Files	Coverage Δ
cmd/root.go	80.76% <100.00%> (+5.04%)	⬆️
internal/http/main.go	79.54% <100.00%> (ø)
internal/config/config.go	96.09% <66.66%> (ø)

... and 2 files with indirect coverage changes

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