kaxil commented on code in PR #64054:
URL: https://github.com/apache/airflow/pull/64054#discussion_r3126579621
##########
airflow-core/tests/unit/api_fastapi/execution_api/versions/head/test_xcoms.py:
##########
@@ -323,6 +324,41 @@ def test_xcom_get_slice_accepts_include_prior_dates(
assert set(response.json()) == set(expected_xcoms)
+ @pytest.mark.parametrize(
+ ("start", "stop", "expected_count_calls"),
+ [
+ pytest.param(None, None, 0, id="no_slice"),
+ pytest.param(5, None, 0, id="positive_start_only"),
+ pytest.param(None, -5, 0, id="negative_stop_only"),
+ pytest.param(-5, None, 0, id="negative_start_only"),
+ pytest.param(5, -3, 1, id="positive_start_negative_stop"),
+ pytest.param(-5, 10, 1, id="negative_start_positive_stop"),
+ pytest.param(-5, -10, 0, id="both_negative_same_sign"),
+ ],
+ )
+ def test_xcom_slice_count_query_called_at_most_once(
+ self, client, dag_maker, session, start, stop, expected_count_calls
+ ):
+ """Test that get_query_count is called at most once (and only when
necessary)
+ for slice requests with negative indices.
+
+ This validates the performance optimization in
get_mapped_xcom_by_slice().
+ """
+ with dag_maker(dag_id="dag"):
+ EmptyOperator(task_id="task")
+ dag_maker.create_dagrun(run_id="runid")
+
+ with
patch("airflow.api_fastapi.execution_api.routes.xcoms.get_query_count") as
mock_count:
+ qs = {}
+ if start is not None:
+ qs["start"] = start
+ if stop is not None:
+ qs["stop"] = stop
+
+
client.get(f"/execution/xcoms/dag/runid/task/test_key/slice?{urllib.parse.urlencode(qs)}")
+
+ assert mock_count.call_count == expected_count_calls
Review Comment:
Two gaps that weaken this test:
1. `mock_count` has no `return_value` configured, so it returns a
`MagicMock`. For the `positive_start_negative_stop` and
`negative_start_positive_stop` cases, that propagates through `stop =
total_count + stop` (or `stop - total_count`) and into `query.slice(...)`,
where SQLAlchemy may raise depending on version.
2. `client.get(...)` is never inspected, so a 500 from the slice path still
passes the assertion -- the test only protects the count-call optimization, not
the code that actually uses `total_count`.
Suggest `mock_count.return_value = 0` to keep the arithmetic coherent, plus
`assert response.status_code == 200` so this test catches regressions in the
slice branch too.
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