improve test coverage

[owenrumney]

No description provided.

[codecov-io]

Codecov Report

Merging #9 (5e75153) into main (e6cd826) will increase coverage by 5.29%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   60.00%   65.29%   +5.29%     
==========================================
  Files          11       11              
  Lines         340      340              
==========================================
+ Hits          204      222      +18     
+ Misses        107       88      -19     
- Partials       29       30       +1     

Impacted Files	Coverage Δ
cmd/squealer/main.go	29.82% <50.00%> (+29.82%)	⬆️
internal/app/squealer/mertics/metrics.go	81.81% <0.00%> (+9.09%)	⬆️

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