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pobsync/src/pobsync_backend/tests/test_retention.py

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from __future__ import annotations
from datetime import datetime, timezone
from django.test import SimpleTestCase
from pobsync.retention import Snapshot, build_retention_plan
class RetentionTests(SimpleTestCase):
def test_always_keeps_newest_snapshot(self) -> None:
snapshots = [
Snapshot("scheduled", "old", "/x/old", datetime(2026, 5, 18, tzinfo=timezone.utc), "success", None),
Snapshot("scheduled", "new", "/x/new", datetime(2026, 5, 19, tzinfo=timezone.utc), "failed", None),
]
plan = build_retention_plan(
snapshots,
retention={"daily": 0, "weekly": 0, "monthly": 0, "yearly": 0},
now=datetime(2026, 5, 19, tzinfo=timezone.utc),
)
self.assertEqual(plan.keep, {"new"})
self.assertEqual(plan.reasons["new"], ["newest"])