test(core): fix unstable unit test coverage

[EYHN]

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[codecov]

Codecov Report

Merging #16 (3b1b2eb) into develop (0725851) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop      #16      +/-   ##
===========================================
- Coverage    80.21%   80.13%   -0.08%     
===========================================
  Files          113      113              
  Lines         5084     5084              
  Branches       479      479              
===========================================
- Hits          4078     4074       -4     
- Misses         868      871       +3     
- Partials       138      139       +1     

Impacted Files	Coverage Δ
...System/Tracker/Database/DatabaseHintFileTracker.cs	94.26% <0.00%> (-0.75%)	⬇️
core/Anything.Search/Indexers/LuceneIndexer.cs	80.90% <0.00%> (-0.51%)	⬇️

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