feat(xos): adding unit tests to XOS model

[RayaneB75]

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

Following #3125, unit tests are added for XOS switches

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.93%. Comparing base (c8d6123) to head (c19d550).
Report is 2 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3355      +/-   ##
==========================================
+ Coverage   70.63%   70.93%   +0.29%     
==========================================
  Files          80       82       +2     
  Lines        3266     3327      +61     
==========================================
+ Hits         2307     2360      +53     
- Misses        959      967       +8     

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[robertcheramy]

The last commit c19d550 introduces exec mode, which does not match to xos.rb (post_login and probably pre_logout commands) and to the YAML Simulation fine (use the option -e in device2yaml.rb)