test: add coverage for Delivery Note Trends report

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

erpnext/stock/report/delivery_note_trends/test_delivery_note_trends.py

@@ -0,0 +1,59 @@
+# Copyright (c) 2026, Frappe Technologies Pvt. Ltd. and Contributors
+# See license.txt
+
+import frappe
+
+from erpnext.tests.utils import ERPNextTestSuite
+
+
+class TestDeliveryNoteTrends(ERPNextTestSuite):
+	def run_report(self, **extra):
+		from erpnext.stock.report.delivery_note_trends.delivery_note_trends import execute
+
+		filters = frappe._dict(
+			{
+				"company": "_Test Company",
+				"fiscal_year": "_Test Fiscal Year 2026",
+				"period": "Yearly",
+				"based_on": "Item",
+			}
+		)
+		filters.update(extra)
+		return execute(filters)[1]
+
+	def test_delivery_qty_in_trend(self):
+		# based_on="Item" + period="Yearly": each row is
+		# [item_code, item_name, currency, yearly_qty, yearly_amt, total_qty, total_amt].
+		# A submitted Delivery Note of qty 5 @ rate 200 should sum to qty 5 / amount 1000
+		# (base_net_amount) in both the yearly bucket and the Total columns.
+		from erpnext.stock.doctype.delivery_note.test_delivery_note import create_delivery_note
+		from erpnext.stock.doctype.item.test_item import make_item
+		from erpnext.stock.doctype.stock_entry.stock_entry_utils import make_stock_entry
+
+		item = make_item(properties={"is_stock_item": 1, "is_sales_item": 1}).name
+
+		make_stock_entry(
+			item_code=item,
+			to_warehouse="_Test Warehouse - _TC",
+			qty=20,
+			rate=100,
+			posting_date="2026-06-01",
+		)
+		create_delivery_note(
+			item_code=item,
+			qty=5,
+			rate=200,
+			company="_Test Company",
+			posting_date="2026-06-01",
+		)
+
+		data = self.run_report()
+
+		item_rows = [row for row in data if row[0] == item]
+		self.assertEqual(len(item_rows), 1)
+
+		row = item_rows[0]
+		self.assertEqual(row[3], 5)  # yearly qty bucket
+		self.assertEqual(row[4], 1000)  # yearly amount bucket (base_net_amount)
+		self.assertEqual(row[5], 5)  # Total(Qty)
+		self.assertEqual(row[6], 1000)  # Total(Amt)