msfroh commented on code in PR #12383:
URL: https://github.com/apache/lucene/pull/12383#discussion_r1240365451


##########
lucene/queries/src/test/org/apache/lucene/queries/function/TestFunctionScoreQuery.java:
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@@ -322,6 +329,19 @@ private void assertInnerScoreMode(
       ScoreMode expectedScoreMode, ScoreMode inputScoreMode, 
DoubleValuesSource valueSource)
       throws IOException {
     final AtomicReference<ScoreMode> scoreModeInWeight = new 
AtomicReference<ScoreMode>();
+    final AtomicBoolean scorerCalled = new AtomicBoolean();
+    searcher.setSimilarity(new Similarity() { // Wrapping existing similarity 
for testing
+      @Override
+      public long computeNorm(FieldInvertState state) {
+        return getDefaultSimilarity().computeNorm(state);
+      }
+
+      @Override
+      public SimScorer scorer(float boost, CollectionStatistics 
collectionStats, TermStatistics... termStats) {
+        scorerCalled.set(true);
+        return getDefaultSimilarity().scorer(boost, collectionStats, 
termStats);
+      }
+    });

Review Comment:
   Instead of explicitly using `getDefaultSimilarity()` here, maybe you should 
get the `IndexSearcher`'s existing `Similarity`?
   
   Of course, it looks like this method gets called multiple times, so you 
could end up wrapping the `Similarity` again and again.



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