test: payments against so/po will show up as outstanding amount

1. Class will use FrappeTestCase fixture
2. setup and teardown methods are introduced
3. test for payments against SO

(cherry picked from commit 36f5883dda)

erpnext/accounts/report/accounts_receivable/test_accounts_receivable.py

@@ -1,19 +1,27 @@
 import unittest
 
 import frappe
+from frappe.tests.utils import FrappeTestCase
 from frappe.utils import add_days, getdate, today
 
 from erpnext.accounts.doctype.payment_entry.payment_entry import get_payment_entry
 from erpnext.accounts.doctype.sales_invoice.test_sales_invoice import create_sales_invoice
 from erpnext.accounts.report.accounts_receivable.accounts_receivable import execute
+from erpnext.selling.doctype.sales_order.test_sales_order import make_sales_order
 
 
-class TestAccountsReceivable(unittest.TestCase):
-	def test_accounts_receivable(self):
+class TestAccountsReceivable(FrappeTestCase):
+	def setUp(self):
 		frappe.db.sql("delete from `tabSales Invoice` where company='_Test Company 2'")
+		frappe.db.sql("delete from `tabSales Order` where company='_Test Company 2'")
+		frappe.db.sql("delete from `tabPayment Entry` where company='_Test Company 2'")
 		frappe.db.sql("delete from `tabGL Entry` where company='_Test Company 2'")
 		frappe.db.sql("delete from `tabPayment Ledger Entry` where company='_Test Company 2'")
 
+	def tearDown(self):
+		frappe.db.rollback()
+
+	def test_accounts_receivable(self):
 		filters = {
 			"company": "_Test Company 2",
 			"based_on_payment_terms": 1,
@@ -66,6 +74,50 @@ class TestAccountsReceivable(unittest.TestCase):
 			],
 		)
 
+	def test_payment_againt_po_in_receivable_report(self):
+		"""
+		Payments made against Purchase Order will show up as outstanding amount
+		"""
+
+		so = make_sales_order(
+			company="_Test Company 2",
+			customer="_Test Customer 2",
+			warehouse="Finished Goods - _TC2",
+			currency="EUR",
+			debit_to="Debtors - _TC2",
+			income_account="Sales - _TC2",
+			expense_account="Cost of Goods Sold - _TC2",
+			cost_center="Main - _TC2",
+		)
+
+		pe = get_payment_entry(so.doctype, so.name)
+		pe = pe.save().submit()
+
+		filters = {
+			"company": "_Test Company 2",
+			"based_on_payment_terms": 0,
+			"report_date": today(),
+			"range1": 30,
+			"range2": 60,
+			"range3": 90,
+			"range4": 120,
+		}
+
+		report = execute(filters)
+
+		expected_data_after_payment = [0, 1000, 0, -1000]
+
+		row = report[1][0]
+		self.assertEqual(
+			expected_data_after_payment,
+			[
+				row.invoiced,
+				row.paid,
+				row.credit_note,
+				row.outstanding,
+			],
+		)
+
 
 def make_sales_invoice():
 	frappe.set_user("Administrator")