satishd commented on code in PR #14034:
URL: https://github.com/apache/kafka/pull/14034#discussion_r1451284647


##########
core/src/test/scala/unit/kafka/log/UnifiedLogTest.scala:
##########
@@ -3951,18 +3953,18 @@ class UnifiedLogTest {
     assertEquals(10, log.logSegments.size())
 
     {
-      val deletable = log.deletableSegments(
-        (segment: LogSegment, _: Option[LogSegment]) => segment.baseOffset <= 
5)
-      val expected = log.nonActiveLogSegmentsFrom(0L).asScala.filter(segment 
=> segment.baseOffset <= 5).toList
-      assertEquals(6, expected.length)
-      assertEquals(expected, deletable.toList)
+      val deletable = new util.ArrayList(

Review Comment:
   This is strictly not needed as it returns `ArrayList` in this test's 
successful case scenario but the same method can return `EmptyList` instance 
also in other case. I wanted the test to fail with details about the elements 
instead of type mismatch.



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