damccorm commented on code in PR #35569:
URL: https://github.com/apache/beam/pull/35569#discussion_r2208365995


##########
sdks/python/apache_beam/transforms/periodicsequence_test.py:
##########
@@ -350,10 +351,20 @@ def process(self, elem):
               start_timestamp=Timestamp.of(1),
               stop_timestamp=Timestamp.of(5),
               fire_interval=1,
-              rebase_timestamp=True)
+              rebase=RebaseMode.REBASE_ALL)
           | beam.ParDo(CheckTimeStamp()))
       assert_that(ret, is_empty())
 
+  def test_rebase_timestamp_with_wrong_setting(self):
+    with self.assertRaises(Exception):
+      with TestPipeline() as p:
+        _ = (
+            p | PeriodicImpulse(
+                start_timestamp=Timestamp.of(1),
+                stop_timestamp=Timestamp.of(5),
+                fire_interval=1,
+                rebase=RebaseMode.REBASE_START))

Review Comment:
   Why does this throw? Is the assumption that there will be a large enough gap 
between start and the pipeline kicking off? If so, lets make the gap as narrow 
as possible since this could be runner dependent.



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