create model unit test and device2yaml for pfsense

[TheMonkeyBrain]

Pre-Request Checklist

• Passes rubocop code analysis (try rubocop --auto-correct)
• Tests added or adapted (try rake test)
• Changes are reflected in the documentation
• User-visible changes appended to CHANGELOG.md

Description

Create model unit test and device2yaml for pfsense

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.63%. Comparing base (9942d81) to head (f31be9e).
Report is 8 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3348      +/-   ##
==========================================
+ Coverage   70.42%   70.63%   +0.21%     
==========================================
  Files          77       80       +3     
  Lines        3202     3266      +64     
==========================================
+ Hits         2255     2307      +52     
- Misses        947      959      +12     

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