dstandish commented on code in PR #60216:
URL: https://github.com/apache/airflow/pull/60216#discussion_r2759573329


##########
airflow-core/tests/unit/models/test_backfill.py:
##########
@@ -363,18 +368,54 @@ def test_active_dag_run(dag_maker, session):
         dag_run_conf={"this": "param"},
     )
     assert b1 is not None
-    with pytest.raises(AlreadyRunningBackfill, match="Another backfill is 
running for dag"):
+
+    # Try to create overlapping backfill - should fail
+    with pytest.raises(AlreadyRunningBackfill, match="Another backfill is 
running for Dag"):

Review Comment:
   So when the backfill is actually being created, then for each run in the 
range, it will check "is this part of an active backfill?"  If it is, it will 
just skip that date.



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