test(integration): explicit null budget_duration on /team/new is not replaced by default_team_params (Pylon #7536)

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

tests/integration/contracts.json

@@ -30,6 +30,9 @@
     ]
   },
   "tests": {
+    "tests/integration/management/test_team_budget_duration_defaults.py::test_team_new_explicit_null_budget_duration_is_not_replaced_by_default": [
+      "mgmt.team.new.explicit_null_budget_duration_overrides_default"
+    ],
     "tests/integration/management/test_key_updates.py::test_update_preserves_independent_fields_and_serving": [
       "mgmt.key.update.preserves_independent_fields"
     ],

tests/integration/management/test_team_budget_duration_defaults.py

@@ -0,0 +1,64 @@
+import uuid
+from collections.abc import Iterator
+from contextlib import contextmanager
+from typing import Final
+
+import pytest
+from pydantic import JsonValue
+
+from tests.integration._support.client import Gateway, string_value
+from tests.integration._support.database import read_rows
+
+
+@contextmanager
+def _default_team_budget_duration(gateway: Gateway, duration: str) -> Iterator[None]:
+    configured: Final = gateway.request("PATCH", "/update/default_team_settings", {"budget_duration": duration})
+    assert configured.status_code == 200, configured.text
+    try:
+        yield
+    finally:
+        cleared: Final = gateway.request("PATCH", "/update/default_team_settings", {})
+        assert cleared.status_code == 200, cleared.text
+
+
+def _budget_row(team_id: str) -> dict[str, JsonValue]:
+    rows: Final = read_rows(
+        'SELECT max_budget, budget_duration, budget_reset_at::text FROM "LiteLLM_TeamTable" WHERE team_id = %s',
+        (team_id,),
+    )
+    assert len(rows) == 1, rows
+    return rows[0]
+
+
+@pytest.mark.covers("mgmt.team.new.explicit_null_budget_duration_overrides_default")
+def test_team_new_explicit_null_budget_duration_is_not_replaced_by_default(gateway: Gateway) -> None:
+    with gateway.scenario() as scenario, _default_team_budget_duration(gateway, "30d"):
+        never_resetting: Final = gateway.request(
+            "POST",
+            "/team/new",
+            {"team_alias": f"integration-{uuid.uuid4().hex}", "max_budget": 500, "budget_duration": None},
+        )
+        assert never_resetting.status_code == 200, never_resetting.text
+        never_resetting_id: Final = string_value(never_resetting.json()["team_id"])
+        scenario.cleanups.callback(scenario.delete_team, never_resetting_id)
+        assert never_resetting.json()["max_budget"] == 500.0, never_resetting.text
+        assert never_resetting.json()["budget_duration"] is None, never_resetting.text
+        assert never_resetting.json()["budget_reset_at"] is None, never_resetting.text
+        assert _budget_row(never_resetting_id) == {
+            "max_budget": 500.0,
+            "budget_duration": None,
+            "budget_reset_at": None,
+        }
+
+        inheriting: Final = gateway.request(
+            "POST", "/team/new", {"team_alias": f"integration-{uuid.uuid4().hex}", "max_budget": 500}
+        )
+        assert inheriting.status_code == 200, inheriting.text
+        inheriting_id: Final = string_value(inheriting.json()["team_id"])
+        scenario.cleanups.callback(scenario.delete_team, inheriting_id)
+        assert inheriting.json()["budget_duration"] == "30d", inheriting.text
+        assert inheriting.json()["budget_reset_at"] is not None, inheriting.text
+        inheriting_row: Final = _budget_row(inheriting_id)
+        assert inheriting_row["max_budget"] == 500.0, inheriting_row
+        assert inheriting_row["budget_duration"] == "30d", inheriting_row
+        assert inheriting_row["budget_reset_at"] is not None, inheriting_row