fix minor inconsistency in sampler test

[SylvainJuge]

The value is not stored nor tested in the AttributePredicate, even if this works with the test below having it hardcoded is probably a refactor leftover.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.12%. Comparing base (23799f2) to head (23ecd1c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7932   +/-   ##
=========================================
  Coverage     90.12%   90.12%           
  Complexity     7411     7411           
=========================================
  Files           833      833           
  Lines         22396    22396           
  Branches       2200     2200           
=========================================
  Hits          20185    20185           
  Misses         1518     1518           
  Partials        693      693           

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