fix: 修正归属工时舍入残差

tests/test_report_allocations.py

@@ -154,6 +154,27 @@ def test_no_device_shared_full_report_splits_effective_minutes_between_items():
     ]
 
 
+def test_short_shared_report_rounding_residual_keeps_aggregate_night_total():
+    start_at = datetime(2026, 5, 3, 1, 4, 50)
+    end_at = datetime(2026, 5, 3, 1, 4, 53)
+    first_item = _item(id=1, good_qty=1)
+    second_item = _item(id=2, good_qty=1)
+    report = _report(start_at, end_at, [first_item, second_item])
+
+    metrics = calculate_report_metrics(start_at, end_at, [first_item, second_item])
+    rows = build_report_allocation_drafts(report)
+
+    assert metrics["effective_minutes"] == 0.05
+    assert metrics["shift_night_minutes"] == 0.05
+    assert [row.allocation_date for row in rows] == [date(2026, 5, 2), date(2026, 5, 2)]
+    assert [row.effective_minutes for row in rows] == [0.03, 0.02]
+    assert round(sum(row.effective_minutes for row in rows), 2) == 0.05
+    assert round(sum(row.night_minutes for row in rows), 2) == 0.05
+    assert round(sum(row.day_minutes for row in rows), 2) == 0
+    assert round(sum(row.overtime_minutes for row in rows), 2) == 0
+    assert all(row.effective_minutes == round(row.day_minutes + row.overtime_minutes + row.night_minutes, 2) for row in rows)
+
+
 def test_items_sharing_same_started_at_split_the_segment_minutes():
     started_at = datetime(2026, 7, 25, 8, 0)
     first_item = _item(id=1, good_qty=10, started_at=started_at)