test: add coverage for Stock Qty vs Serial No Count report

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

erpnext/stock/report/stock_qty_vs_serial_no_count/test_stock_qty_vs_serial_no_count.py

@@ -0,0 +1,54 @@
+# Copyright (c) 2026, Frappe Technologies Pvt. Ltd. and Contributors
+# See license.txt
+
+import frappe
+
+from erpnext.stock.doctype.item.test_item import make_item
+from erpnext.stock.doctype.stock_entry.stock_entry_utils import make_stock_entry
+from erpnext.stock.report.stock_qty_vs_serial_no_count.stock_qty_vs_serial_no_count import execute
+from erpnext.tests.utils import ERPNextTestSuite
+
+
+class TestStockQtyVsSerialNoCount(ERPNextTestSuite):
+	def run_report(self, **extra):
+		filters = {
+			"company": "_Test Company",
+			"warehouse": "_Test Warehouse - _TC",
+		}
+		filters.update(extra)
+		return execute(frappe._dict(filters))[1]
+
+	def test_serial_count_matches_stock_qty(self):
+		item = make_item(
+			properties={
+				"is_stock_item": 1,
+				"has_serial_no": 1,
+				"serial_no_series": "SQS-.#####",
+			}
+		).name
+		make_stock_entry(
+			item_code=item,
+			to_warehouse="_Test Warehouse - _TC",
+			qty=3,
+			rate=100,
+			posting_date="2026-06-01",
+		)
+
+		data = self.run_report()
+		row = next((entry for entry in data if entry["item_code"] == item), None)
+
+		self.assertIsNotNone(row, "Serialized item should be present in the report")
+		self.assertEqual(row["total"], 3)
+		self.assertEqual(row["stock_qty"], 3)
+		self.assertEqual(row["difference"], 0)
+
+	def test_warehouse_is_validated(self):
+		with self.assertRaises(frappe.ValidationError):
+			execute(
+				frappe._dict(
+					{
+						"company": "_Test Company",
+						"warehouse": "Non Existent Warehouse - XYZ",
+					}
+				)
+			)