prevent abuse of mock

[JacksonTian]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.26%. Comparing base (9b3cc8d) to head (4126b80). Report is 3 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #951      +/-   ##
============================================
+ Coverage     90.16%   90.26%   +0.09%     
- Complexity     1649     1677      +28     
============================================
  Files           123      124       +1     
  Lines          4737     4826      +89     
  Branches        536      552      +16     
============================================
+ Hits           4271     4356      +85     
  Misses          342      342              
- Partials        124      128       +4     

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