fix(test): Follow up test fix to target correct extension method.

[EvilKot]

Related to PR #271

[EvilKot]

Noticed issue with the test, since TestUtils also provides ToQueryString extension method, however the one in the InternalExtensions class should be actually tested.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.38%. Comparing base (f45d418) to head (b304c20).
Report is 113 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #273       +/-   ##
===========================================
+ Coverage   50.38%   63.38%   +13.00%     
===========================================
  Files         277      399      +122     
  Lines        3688     6084     +2396     
  Branches        0      501      +501     
===========================================
+ Hits         1858     3856     +1998     
- Misses       1830     2189      +359     
- Partials        0       39       +39     

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[EvilKot]

cc: @andrii-bodnar

[andrii-bodnar]

@EvilKot thank you!