Fix randomly failing tests

[Zales0123]

The reason was, as we're using fixtures in tests, from time to time the product was configured with not-included in price taxes, which were also changing after the discount was added 🖖

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.89%. Comparing base (5cf3658) to head (5e3063c).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master       #9   +/-   ##
=========================================
  Coverage     76.89%   76.89%           
  Complexity       49       49           
=========================================
  Files            22       22           
  Lines           238      238           
=========================================
  Hits            183      183           
  Misses           55       55           

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