test: More tests for uniqueItems

[Stranger6667]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.59%. Comparing base (d133bdc) to head (84f4ab9).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #519      +/-   ##
==========================================
+ Coverage   85.48%   85.59%   +0.10%     
==========================================
  Files          69       69              
  Lines       10568    10583      +15     
==========================================
+ Hits         9034     9058      +24     
+ Misses       1534     1525       -9     

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[codspeed-hq]

CodSpeed Performance Report

Merging #519 will degrade performances by 10.21%

_{Comparing dd/more-tests (84f4ab9) with master (d133bdc)}

Summary

❌ 1 (👁 1) regressions
✅ 16 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	dd/more-tests	Change
👁	Fast/Invalid[is_valid]	769.4 ns	856.9 ns	-10.21%