test: cover last purchase rate and valuation rate in Item Prices report

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

erpnext/stock/report/item_prices/test_item_prices.py

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+# Copyright (c) 2026, Frappe Technologies Pvt. Ltd. and Contributors
+# See license.txt
+
+import frappe
+
+from erpnext.stock.doctype.purchase_receipt.test_purchase_receipt import make_purchase_receipt
+from erpnext.stock.doctype.stock_entry.stock_entry_utils import make_stock_entry
+from erpnext.stock.report.item_prices.item_prices import execute
+from erpnext.tests.utils import ERPNextTestSuite
+
+# Positional columns returned by the report (it returns string-format columns,
+# not dicts, so rows are plain lists indexed by position).
+ITEM_CODE = 0
+LAST_PURCHASE_RATE = 6
+VALUATION_RATE = 7
+SALES_PRICE_LIST = 8
+PURCHASE_PRICE_LIST = 9
+
+
+class TestItemPrices(ERPNextTestSuite):
+	"""Correctness tests for the Item Prices report."""
+
+	def run_report(self, **extra):
+		filters = frappe._dict({"items": "Enabled Items only", **extra})
+		return execute(filters)[1]
+
+	def row_for(self, data, item_code):
+		for row in data:
+			if row[ITEM_CODE] == item_code:
+				return row
+		self.fail(f"No report row found for item {item_code}")
+
+	def test_item_selling_price_listed(self):
+		"""A Standard Selling Item Price shows up in the Sales Price List column."""
+		item = "_Test Item"
+		frappe.get_doc(
+			{
+				"doctype": "Item Price",
+				"item_code": item,
+				"price_list": "Standard Selling",
+				"price_list_rate": 250,
+			}
+		).insert()
+
+		row = self.row_for(self.run_report(), item)
+		self.assertIn("250.0", row[SALES_PRICE_LIST])
+		self.assertIn("Standard Selling", row[SALES_PRICE_LIST])
+		# A selling price must not leak into the buying column.
+		self.assertNotIn("250.0", row[PURCHASE_PRICE_LIST] or "")
+		self.assertNotIn("Standard Selling", row[PURCHASE_PRICE_LIST] or "")
+
+	def test_item_buying_price_listed(self):
+		"""A Standard Buying Item Price shows up in the Purchase Price List column."""
+		item = "_Test Item 2"
+		frappe.get_doc(
+			{
+				"doctype": "Item Price",
+				"item_code": item,
+				"price_list": "Standard Buying",
+				"price_list_rate": 175,
+			}
+		).insert()
+
+		row = self.row_for(self.run_report(), item)
+		self.assertIn("175.0", row[PURCHASE_PRICE_LIST])
+		self.assertIn("Standard Buying", row[PURCHASE_PRICE_LIST])
+		# A buying price must not leak into the selling column.
+		self.assertNotIn("175.0", row[SALES_PRICE_LIST] or "")
+		self.assertNotIn("Standard Buying", row[SALES_PRICE_LIST] or "")
+
+	def test_last_purchase_rate_from_receipt(self):
+		"""The latest purchase rate (from a Purchase Receipt) shows in the Last Purchase Rate column."""
+		item = "_Test Item"
+		make_purchase_receipt(
+			item_code=item, qty=5, rate=500, company="_Test Company", posting_date="2026-06-01"
+		)
+
+		row = self.row_for(self.run_report(), item)
+		self.assertEqual(row[LAST_PURCHASE_RATE], 500)
+
+	def test_valuation_rate_from_stock(self):
+		"""The Bin valuation rate shows in the Valuation Rate column."""
+		# _Test FG Item has no opening-stock baseline, so its valuation reflects only this receipt
+		item = "_Test FG Item"
+		make_stock_entry(
+			item_code=item, to_warehouse="Stores - _TC", qty=10, rate=250, posting_date="2026-06-01"
+		)
+
+		row = self.row_for(self.run_report(), item)
+		self.assertEqual(row[VALUATION_RATE], 250)