msokolov commented on PR #15120:
URL: https://github.com/apache/lucene/pull/15120#issuecomment-3220901546

   Lucene doesn't really separate unit tests from integration tests, because it 
doesn't ship a service. But you can write unit tests at different levels of 
abstraction. I think what you've done here (create an index, add some docs, 
trigger merges, check the output) is about what we'd expect. But if you want to 
also test the size estimation of merges kicked off by "internal" policies, 
maybe the best way is to use RandomIndexWriter, which will sometimes randomly 
kick off some merges of its own?  TBH this isn't an area of the code I know 
super well, and I commented mostly to understand what was going on!


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