Make TestTrait::getDriverName() static

[Tigrov]

Related PR

• Add CaseExpression db#988

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.56%. Comparing base (a19a6e2) to head (ef810ee).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #367   +/-   ##
=========================================
  Coverage     98.56%   98.56%           
  Complexity      229      229           
=========================================
  Files            19       19           
  Lines           768      768           
=========================================
  Hits            757      757           
  Misses           11       11           

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