fix: add divide by 0 use case

[thomasrockhu-codecov]

[codecov[bot]]

Codecov Report

Merging #81 (5d087cd) into main (0e76edc) will decrease coverage by 6.89%. The diff coverage is n/a.

Changes have been made to critical files, which contain lines commonly executed in production. Learn more

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
- Coverage   97.22%   90.32%   -6.90%     
==========================================
  Files           2        2              
  Lines          36       31       -5     
==========================================
- Hits           35       28       -7     
- Misses          1        3       +2     

Impacted Files	Coverage Δ
app/test_calculator.py	100.00% <ø> (ø)
app/calculator.py Critical	72.72% <0.00%> (-18.19%)	:arrow_down:

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.