Add more test for custom fakers

[snuyanzin]

Currently pass however it might be a guard before PR like #1819
is ready to be merged

[snuyanzin]

edge case for different fakers with same methods

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.48%. Comparing base (a179fdd) to head (2306483).
⚠️ Report is 8 commits behind head on main.
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Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1859      +/-   ##
============================================
+ Coverage     92.37%   92.48%   +0.10%     
- Complexity     3515     3560      +45     
============================================
  Files           344      345       +1     
  Lines          6968     7037      +69     
  Branches        684      686       +2     
============================================
+ Hits           6437     6508      +71     
  Misses          366      366              
+ Partials        165      163       -2     

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[kingthorin]

Thanks