test: adding test coverage for designer, sketch, misc

[syscordan]

Description

adding test coverage for designer, sketch, misc*

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate unit tests.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have added the minimum version decorator to any new backend method implemented.
• I have made sure that the title of my PR follows Conventional commits style (e.g. feat: extrude circle to cylinder)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.84%. Comparing base (12242ce) to head (ac63bf4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2070      +/-   ##
==========================================
+ Coverage   92.61%   92.84%   +0.23%     
==========================================
  Files         136      136              
  Lines        9812     9812              
==========================================
+ Hits         9087     9110      +23     
+ Misses        725      702      -23     

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[RobPasMue]

Few comments - thanks for the tests @syscordan!

[RobPasMue]

Some last comments @syscordan - just for separation of concerns. Thanks!

[RobPasMue]

LGTM!