Test ArrayableTrait separately

[Tigrov]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	#308

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.32%. Comparing base (9bbef58) to head (89db248).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #382      +/-   ##
============================================
- Coverage     87.36%   85.32%   -2.05%     
  Complexity      595      595              
============================================
  Files            17       17              
  Lines          1417     1417              
============================================
- Hits           1238     1209      -29     
- Misses          179      208      +29     

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