[2.x] Fix bug in tests.

[r-kujawa]

What does this PR do? 🤖

Fixes issue where tests are assuming the database driver is being used.

How should this be tested? 🔬

phpunit

Does this relate to any issue? 🔗

Closes #57

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 61.20%. Comparing base (469a8d7) to head (caba4b2).

Files	Patch %	Lines
src/Models/Payment.php	0.00%	3 Missing ⚠️
src/Models/PaymentInstrument.php	0.00%	3 Missing ⚠️
src/Models/Wallet.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #61      +/-   ##
============================================
- Coverage     61.69%   61.20%   -0.49%     
+ Complexity       87       79       -8     
============================================
  Files            18       17       -1     
  Lines           201      183      -18     
============================================
- Hits            124      112      -12     
+ Misses           77       71       -6     

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