Refactored the purchase test

[rofrano]

Refactored the test case for purchasing a pet to specifically create a pet where available = True to ensure that the purchase actions sets it to False

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.63%. Comparing base (2218e2c) to head (22e5116).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #48   +/-   ##
=======================================
  Coverage   96.63%   96.63%           
=======================================
  Files           8        8           
  Lines         327      327           
=======================================
  Hits          316      316           
  Misses         11       11           

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