Test more WebAPI examples

[Saibamen]

Test NSwagClientExample in SwaggerIntegrationTests. Test Basic, CustomDocumentSerializer and NSwagClientExample in Verify tests.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.16%. Comparing base (c4a132e) to head (ecac972).
Report is 2 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3149      +/-   ##
==========================================
+ Coverage   82.11%   83.16%   +1.05%     
==========================================
  Files          76       76              
  Lines        3125     3125              
  Branches      526      526              
==========================================
+ Hits         2566     2599      +33     
+ Misses        559      526      -33     

Flag	Coverage Δ
Linux	83.16% <ø> (+1.05%)	⬆️
Windows	83.16% <ø> (+1.05%)	⬆️
macOS	83.16% <ø> (+1.05%)	⬆️

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