test: Add test for api.ietf_utils

[kesara]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.80%. Comparing base (7c1479b) to head (4e80ea1).
Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8965   +/-   ##
=======================================
  Coverage   88.79%   88.80%           
=======================================
  Files         314      314           
  Lines       41402    41421   +19     
=======================================
+ Hits        36764    36783   +19     
  Misses       4638     4638           

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[jennifer-richards]

Thank you for doing this! There are a couple other cases that would be good to exercise, plus an import to adjust.

[jennifer-richards]

One further change request and then I'm happy :-)