CMCL-0000: Add a simple test to ensure spline cart is working correctly

[AntoineCharton]

Purpose of this PR

Make sure we have minimal coverage on spline Cart component

Testing status

• Added an automated test
• Passed all automated tests
• Manually tested

Documentation status

None unit test

Technical risk

None

Comments to reviewers

Had a non intrusive tests that checks Spline Cart is minimally working.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.05%. Comparing base (cedfb6c) to head (8c84cdd).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1002      +/-   ##
==========================================
+ Coverage   26.80%   27.05%   +0.25%     
==========================================
  Files         249      250       +1     
  Lines       28215    28235      +20     
==========================================
+ Hits         7562     7639      +77     
+ Misses      20653    20596      -57     

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