tests/test error handler

[onerandomusername]

tests 99% of the error handler to ensure that all errors are handled properly and don't raise more errors.

[codecov]

Codecov Report

Merging #94 (6935988) into main (4b07917) will increase coverage by 6.60%.
The diff coverage is 97.95%.

❗ Current head 6935988 differs from pull request most recent head 09472f3. Consider uploading reports for the commit 09472f3 to get more accurate results

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
+ Coverage   70.90%   77.51%   +6.60%     
==========================================
  Files          33       33              
  Lines        1619     1739     +120     
  Branches      199      222      +23     
==========================================
+ Hits         1148     1348     +200     
+ Misses        439      357      -82     
- Partials       32       34       +2     

Impacted Files	Coverage Δ
modmail/extensions/utils/error_handler.py	96.87% <95.00%> (+66.22%)	⬆️
...sts/modmail/extensions/utils/test_error_handler.py	98.74% <98.42%> (-1.26%)	⬇️

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[coveralls]

Coverage increased (+3.4%) to 73.349% when pulling 09472f3 on tests/test-error-handler into 0c4e1c2 on main.