raphaelauv commented on code in PR #37267:
URL: https://github.com/apache/airflow/pull/37267#discussion_r1484518966


##########
tests/models/test_taskmixin.py:
##########
@@ -244,3 +270,67 @@ def test_set_downstream_list(self, dag_maker):
         assert [] == op_b.upstream_list
         assert [op_a] == op_d.upstream_list
         assert {op_a, op_b} == set(op_c.upstream_list)
+
+    def test_set_upstream_inner_list(self, dag_maker):
+        with dag_maker("test_set_upstream_inner_list"):
+            op_a = EmptyOperator(task_id="a")
+            op_b = EmptyOperator(task_id="b")
+            op_c = EmptyOperator(task_id="c")
+            op_d = EmptyOperator(task_id="d")
+        with pytest.raises(AttributeError) as e_info:
+            [op_d << [op_c, op_b]] << op_a
+
+        assert str(e_info.value) == "'list' object has no attribute 
'update_relative'"
+
+        assert [] == op_b.upstream_list
+        assert [] == op_c.upstream_list
+        assert {op_b, op_c} == set(op_d.upstream_list)

Review Comment:
   these are the assert that we want fix ,it explicit the current "problem"
   
   and the PR fixing it will just have to change the assert



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