vsop-479 commented on code in PR #15823:
URL: https://github.com/apache/lucene/pull/15823#discussion_r3013257318


##########
lucene/core/src/test/org/apache/lucene/util/TestPriorityQueue.java:
##########
@@ -159,6 +160,57 @@ public void testInsertWithOverflow() {
     assertThat(pq.top(), equalTo(2));
   }
 
+  public void testAddAllWithStream() {
+    PriorityQueue<Integer> pq = new IntegerQueue(6);
+    List<String> elements = new ArrayList<>();
+    for (String s : Arrays.asList("a", "b", "c", "d", "e", "f")) {
+      if (random().nextBoolean()) {
+        elements.addFirst(s);
+      } else {
+        elements.addLast(s);
+      }
+    }
+
+    pq.addAll(elements.stream().map(String::hashCode));
+    assertEquals("a".hashCode(), pq.top().intValue());
+  }
+
+  public void testAddAllWithStreamNotFitIntoQueue() {
+    PriorityQueue<Integer> pq = new IntegerQueue(10);
+    List<String> elements = new ArrayList<>();
+    for (String s : Arrays.asList("a", "b", "c", "d", "e", "f", "g", "h", "i", 
"j", "k")) {
+      if (random().nextBoolean()) {
+        elements.addFirst(s);
+      } else {
+        elements.addLast(s);
+      }
+    }
+
+    assertThrows(
+        "Cannot add 11 elements to a queue with remaining capacity: 10",
+        ArrayIndexOutOfBoundsException.class,
+        () -> pq.addAll(elements.stream().map(String::hashCode)));
+    // Partly added.
+    assertEquals(10, pq.size());
+    assertHeap(pq);

Review Comment:
   > but you could also pop elements off the heap in a loop and assert the 
ordered nature of what comes out. It's nice that you avoid mutating the heap 
here with your check
   
   Yes, pop and assert the order came to my mind firstly. And in order to avoid 
mutate the heap, I picked  this apporach.
   
   > but since it's the last thing we're doing in a unit test, it might be 
simpler to just pop stuff off the heap and check rather than writing custom 
heap traversal logic?
   
   But, you are right.



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