Refactor and add test coverage

[mcpherrinm]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 25.92593% with 120 lines in your changes missing coverage. Please review.

Project coverage is 21.87%. Comparing base (5e9c7ff) to head (bac94b2).
Report is 4 commits behind head on main.

Files with missing lines	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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