fix(handlers): unknownHandler typo

[hparra]

Description

Fix typo for unknownHandler and add some tests where that code was use.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[auniverseaway]

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.16%. Comparing base (e407d91) to head (720e55f).
Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #87       +/-   ##
===========================================
+ Coverage   53.64%   75.16%   +21.51%     
===========================================
  Files          38       38               
  Lines        1795     1796        +1     
===========================================
+ Hits          963     1350      +387     
+ Misses        832      446      -386     

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