FrankChen021 commented on code in PR #19940:
URL: https://github.com/apache/druid/pull/19940#discussion_r3743844687


##########
processing/src/test/java/org/apache/druid/segment/CloserExtension.java:
##########
@@ -0,0 +1,108 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.druid.segment;
+
+import org.apache.druid.java.util.common.io.Closer;
+import org.apache.druid.java.util.common.logger.Logger;
+import org.junit.jupiter.api.extension.AfterEachCallback;
+import org.junit.jupiter.api.extension.BeforeEachCallback;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.api.extension.TestExecutionExceptionHandler;
+
+import java.io.Closeable;
+import java.io.IOException;
+
+/**
+ * JUnit 5 counterpart to {@link CloserRule}. The rule remains available for 
tests that have not
+ * migrated yet.
+ */
+public class CloserExtension implements BeforeEachCallback, AfterEachCallback, 
TestExecutionExceptionHandler
+{
+  private static final Logger LOG = new Logger(CloserExtension.class);
+
+  private final boolean throwException;
+  private Closer closer;
+
+  public CloserExtension()
+  {
+    this(false);
+  }
+
+  public CloserExtension(final boolean throwException)
+  {
+    this.throwException = throwException;
+  }
+
+  @Override
+  public void beforeEach(final ExtensionContext context)
+  {
+    closer = Closer.create();

Review Comment:
   [P2] beforeEach discards early registrations
   
   If closeLater() is called during test-instance construction, the extension 
registers the resource on one Closer, then unconditionally replaces it in 
beforeEach; the resource is never closed. Preserve an existing closer or 
initialize it without overwriting registrations.



##########
processing/src/test/java/org/apache/druid/collections/bitmap/BitmapIterationTest.java:
##########
@@ -19,135 +19,42 @@
 
 package org.apache.druid.collections.bitmap;
 
-import com.google.common.collect.UnmodifiableIterator;
-import com.google.common.collect.testing.CollectionTestSuiteBuilder;
-import com.google.common.collect.testing.SampleElements;
-import com.google.common.collect.testing.TestCollectionGenerator;
-import com.google.common.collect.testing.features.CollectionFeature;
-import com.google.common.collect.testing.features.CollectionSize;
-import junit.framework.Test;
-import junit.framework.TestCase;
-import junit.framework.TestSuite;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
 import org.roaringbitmap.IntIterator;
 
-import java.util.AbstractCollection;
-import java.util.Arrays;
-import java.util.Collections;
 import java.util.List;
 
-public class BitmapIterationTest extends TestCase
+public class BitmapIterationTest
 {
-  public static Test suite()
+  public static List<BitmapFactory> factories()
   {
-    List<BitmapFactory> factories = Arrays.asList(
-        new BitSetBitmapFactory(),
-        new ConciseBitmapFactory()
-        // Roaring iteration fails because it doesn't throw 
NoSuchElementException on next() call when there are no more
-        // elements. Instead, it either throws NullPointerException or returns 
some unspecified value. If bitmap
-        // iterators are always used correctly in shouldn't be a problem, but 
if next() is occasionally called after
-        // hasNext() returned false and it returns some unspecified value, and 
everything continues to work without
-        // indication that there was a error, it would be a bug that is very 
hard to catch.
-        //
-        // This line should be uncommented when Druid updates RoaringBitmap 
dependency to a version which includes a fix
-        // for https://github.com/RoaringBitmap/RoaringBitmap/issues/129, or 
when RoaringBitmap is included into Druid
-        // as a module and the issue is fixed there.
-
-        //new RoaringBitmapFactory()
-    );
-
-    TestSuite suite = new TestSuite();
-    for (BitmapFactory factory : factories) {
-      suite.addTest(suiteForFactory(factory));
-    }
-    return suite;
+    return List.of(new BitSetBitmapFactory(), new ConciseBitmapFactory());
   }
 
-  private static Test suiteForFactory(BitmapFactory factory)
+  @ParameterizedTest

Review Comment:
   [P2] Bitmap iterator contract coverage was removed
   
   The former Guava suite covered arbitrary sizes, ordering, duplicates, 
restricted elements, and iterator contract behavior. The replacement checks 
only [1, 3] and empty iteration, allowing regressions in boundary and 
exhaustion behavior to pass. Port the contract cases to Jupiter or retain 
equivalent generated coverage.



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