test: add mock exception

[zhiheng123]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.37%. Comparing base (a2e3633) to head (2b38d84).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #27      +/-   ##
============================================
+ Coverage     76.55%   81.37%   +4.82%     
  Complexity       54       54              
============================================
  Files            33       33              
  Lines           145      145              
  Branches          3        3              
============================================
+ Hits            111      118       +7     
+ Misses           30       23       -7     
  Partials          4        4              

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