Add missing test in FunctionNaming

[BraisGabin]

No description provided.

[codecov]

Codecov Report

Merging #3976 (25fec9b) into main (ce7bb32) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #3976      +/-   ##
============================================
+ Coverage     83.48%   83.49%   +0.01%     
- Complexity     3159     3160       +1     
============================================
  Files           458      458              
  Lines          9047     9047              
  Branches       1759     1759              
============================================
+ Hits           7553     7554       +1     
  Misses          567      567              
+ Partials        927      926       -1     

Impacted Files	Coverage Δ
...b/arturbosch/detekt/rules/naming/FunctionNaming.kt	100.00% <0.00%> (+3.84%)	⬆️

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