lukecwik commented on code in PR #22953:
URL: https://github.com/apache/beam/pull/22953#discussion_r1036500319


##########
sdks/java/core/src/test/java/org/apache/beam/sdk/transforms/GroupIntoBatchesTest.java:
##########
@@ -709,4 +645,136 @@ public void processElement(ProcessContext c, 
BoundedWindow window) {
 
     pipeline.run().waitUntilFinish();
   }
+
+  @Test
+  @Category({
+    ValidatesRunner.class,
+    NeedsRunner.class,
+    UsesTimersInParDo.class,
+    UsesTestStream.class,
+    UsesStatefulParDo.class,
+    UsesOnWindowExpiration.class
+  })
+  public void 
testMultipleLimitsAtOnceInGlobalWindowBatchSizeCountAndBatchSizeByteSize() {
+    // with using only one of the limits the result would be only 2 batches,
+    // if we have 3 both limit works
+    List<KV<String, String>> dataToUse =
+        Lists.newArrayList(
+                "a-1",
+                "a-2",
+                "a-3" + Strings.repeat("-", 100),
+                // byte size limit reached (BATCH_SIZE_BYTES = 25)
+                "b-4",
+                "b-5",
+                "b-6",
+                "b-7",
+                "b-8",
+                // count limit reached (BATCH_SIZE = 5)
+                "c-9")
+            .stream()
+            .map(s -> KV.of("key", s))
+            .collect(Collectors.toList());
+
+    // to ensure ordered firing
+    TestStream.Builder<KV<String, String>> streamBuilder =
+        TestStream.create(KvCoder.of(StringUtf8Coder.of(), 
StringUtf8Coder.of()))
+            .advanceWatermarkTo(Instant.EPOCH);
+
+    long offset = 0L;
+    for (KV<String, String> kv : dataToUse) {

Review Comment:
   Your right, each addElements call is its own batch that need to be processed.



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