Refactor and add test coverage

[mcpherrinm]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 120 lines in your changes are missing coverage. Please review.

Comparison is base (5e9c7ff) 5.23% compared to head (bac94b2) 21.87%.

Files	Patch %	Lines
internal/exporter/exporter.go	26.08%	113 Missing and 6 partials ⚠️
unbound_exporter.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##            main      #68       +/-   ##
==========================================
+ Coverage   5.23%   21.87%   +16.63%     
==========================================
  Files          1        2        +1     
  Lines        191      192        +1     
==========================================
+ Hits          10       42       +32     
+ Misses       181      144       -37     
- Partials       0        6        +6     

Flag	Coverage Δ
unbound_exporter_tests	21.87% <25.92%> (+16.63%)	⬆️

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