Add coverage to rtf

[Melkiades]

Goal is > 80%, current is ~83.56%

[Melkiades]

Ready for your review @davidgohel. Update on coverage (missing cov > 80%):

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.29%. Comparing base (338ea33) to head (4513c62).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #553      +/-   ##
==========================================
+ Coverage   74.09%   83.29%   +9.19%     
==========================================
  Files          40       40              
  Lines        5609     5609              
==========================================
+ Hits         4156     4672     +516     
+ Misses       1453      937     -516     

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[davidgohel]

Thank you for the time you spent on this. Just as a small note, generally I don't bother with testing defunct functions, but it's nice to have!