test firstOrCreate method for the model

[abolfazl-rasoli]

Hi ✋

I think there was a need to test the firstOrCreate method in this class.

[codecov-commenter]

Codecov Report

Merging #2399 (6a09858) into master (f4c448f) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2399   +/-   ##
=========================================
  Coverage     87.62%   87.62%           
  Complexity      676      676           
=========================================
  Files            31       31           
  Lines          1551     1551           
=========================================
  Hits           1359     1359           
  Misses          192      192           

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