lukecwik commented on a change in pull request #12637:
URL: https://github.com/apache/beam/pull/12637#discussion_r492828079



##########
File path: sdks/python/apache_beam/runners/worker/data_plane_test.py
##########
@@ -108,16 +106,28 @@ def send(instruction_id, transform_id, data):
         ])
 
     # Multiple interleaved writes to multiple instructions.
-    send('1', transform_1, b'abc')
-    send('2', transform_1, b'def')
+    stream11 = from_channel.output_stream('1', transform_1)
+    stream11.write(b'abc')
+    stream21 = from_channel.output_stream('2', transform_1)
+    stream21.write(b'def')
+    if not time_based_flush:
+      stream11.close()
     self.assertEqual(
         list(
             itertools.islice(to_channel.input_elements('1', [transform_1]), 
1)),
         [
             beam_fn_api_pb2.Elements.Data(
                 instruction_id='1', transform_id=transform_1, data=b'abc')
         ])
-    send('2', transform_2, b'ghi')
+    if time_based_flush:

Review comment:
       Please add details as comment.




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