showuon commented on a change in pull request #11124:
URL: https://github.com/apache/kafka/pull/11124#discussion_r679682334



##########
File path: 
streams/src/test/java/org/apache/kafka/streams/kstream/internals/KStreamSlidingWindowAggregateTest.java
##########
@@ -100,17 +99,78 @@
 
     private final Properties props = 
StreamsTestUtils.getStreamsConfig(Serdes.String(), Serdes.String());
     private final String threadId = Thread.currentThread().getName();
+    private final String topic = "topic";
+    private final String defaultInOrderName = "InOrder";
+    private final String defaultReverseName = "Reverse";
+    private final long defaultWindowSize = 10L;
+    private final long defaultRetentionPeriod = 5000L;
+
+    private WindowBytesStoreSupplier getStoreSupplier(final boolean 
inOrderIterator,
+                                                      final String inOrderName,
+                                                      final String reverseName,
+                                                      final long windowSize) {
+        return inOrderIterator
+            ? new InOrderMemoryWindowStoreSupplier(inOrderName, 
defaultRetentionPeriod, windowSize, false)
+            : Stores.inMemoryWindowStore(reverseName, 
ofMillis(defaultRetentionPeriod), ofMillis(windowSize), false);
+    }
+
+    @SuppressWarnings("unchecked")
+    @Test
+    public void testAggregateSmallInputWithZeroTimeDifference() {
+        final StreamsBuilder builder = new StreamsBuilder();
+
+        // create a window store supplier with window size of 0
+        final WindowBytesStoreSupplier storeSupplier = 
getStoreSupplier(inOrderIterator, defaultInOrderName, defaultReverseName, 0L);

Review comment:
       We can create window store with window size of 0 now.




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