Increase test coverage

[sashabaranov]

Summary

• add success case to form builder tests
• ensure request builder handles invalid URLs

Testing

• go test ./... -coverprofile=coverage.out

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https://chatgpt.com/codex/tasks/task_e_6870f366accc832585223d9f49b216bf

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.57%. Comparing base (a0c185f) to head (e999f1f).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1036      +/-   ##
==========================================
+ Coverage   87.41%   87.57%   +0.16%     
==========================================
  Files          43       43              
  Lines        2415     2415              
==========================================
+ Hits         2111     2115       +4     
+ Misses        284      281       -3     
+ Partials       20       19       -1     

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