Add form builder tests

[sashabaranov]

No description provided.

[codecov]

Codecov Report

Merging #241 (1191078) into master (334ee6d) will increase coverage by 2.19%.
The diff coverage is n/a.

❗ Current head 1191078 differs from pull request most recent head d56a8b2. Consider uploading reports for the commit d56a8b2 to get more accurate results

@@            Coverage Diff             @@
##           master     #241      +/-   ##
==========================================
+ Coverage   87.81%   90.01%   +2.19%     
==========================================
  Files          22       22              
  Lines         591      591              
==========================================
+ Hits          519      532      +13     
+ Misses         54       43      -11     
+ Partials       18       16       -2     

see 2 files with indirect coverage changes

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