Additional test asserts for edge cases in proselint tool plugin.

[tdenewiler]

No description provided.

[codecov-commenter]

Codecov Report

Merging #39 (619fe26) into main (1b50b27) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #39   +/-   ##
=======================================
  Coverage   95.86%   95.86%           
=======================================
  Files           6        6           
  Lines         242      242           
=======================================
  Hits          232      232           
  Misses         10       10           

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