test: nurbs length test

[jacobrkerstetter]

Description

added test for NURBSCurve lengths that was missing before

Issue linked

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 94.87%. Comparing base (ca8fc7c) to head (647fb13).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2142      +/-   ##
==========================================
+ Coverage   94.77%   94.87%   +0.10%     
==========================================
  Files         141      141              
  Lines       10307    10307              
==========================================
+ Hits         9768     9779      +11     
+ Misses        539      528      -11     

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