yunhobb commented on code in PR #64297:
URL: https://github.com/apache/airflow/pull/64297#discussion_r3016425169


##########
task-sdk/tests/task_sdk/execution_time/test_task_runner.py:
##########
@@ -2058,6 +2027,42 @@ def mock_get_all_side_effect(task_id, **kwargs):
                 assert mock_get_one.called
                 assert not mock_get_all.called
 
+    @pytest.mark.parametrize(
+        ("task_ids", "default", "expected_value"),
+        [
+            pytest.param("task_a", "fallback", "fallback", 
id="single_task_str_default"),
+            pytest.param("task_a", NOTSET, NOTSET, 
id="single_task_NOTSET_default"),
+            pytest.param(["task_a"], "fallback", ["fallback"], 
id="list_task_str_default"),
+            pytest.param(
+                ["task_a", "task_b"],
+                "fallback",
+                ["fallback", "fallback"],
+                id="multiple_tasks_str_default",
+            ),
+        ],
+    )
+    def test_xcom_pull_default_with_notset_map_indexes(

Review Comment:
   @amoghrajesh Thank for feedback!
   
   > 2. XCom.get_all() returns an empty list instead of None?
   
   Do you mean I should add a test case where XCom.get_all() returns [] and 
verify that it falls through to `xcoms.extend(values)` without applying the 
default?



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