dweiss commented on code in PR #12778:
URL: https://github.com/apache/lucene/pull/12778#discussion_r1384432877


##########
lucene/core/src/test/org/apache/lucene/util/TestByteBlockPool.java:
##########
@@ -25,7 +24,34 @@
 
 public class TestByteBlockPool extends LuceneTestCase {
 
-  public void testReadAndWrite() throws IOException {
+  public void testAppendFromOtherPool() {
+    ByteBlockPool pool = new ByteBlockPool(new 
ByteBlockPool.DirectAllocator());
+    final int numBytes = atLeast(2 << 16);
+    byte[] bytes = new byte[numBytes];
+    for (int i = 0; i < numBytes; i++) {
+      bytes[i] = (byte) random().nextInt(256);

Review Comment:
   The test will be faster if you pull random() outside of the loop or - even 
better - create a local new Random(random().nextLong()) and use that in the 
loop. 
   
   Alternatively, take a look at RandomBytes.randomBytesOfLength()...



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