test: add unit test for deletion of gain loss jv while deleting payment entry

erpnext/accounts/doctype/payment_entry/test_payment_entry.py

@@ -1791,6 +1791,79 @@ class TestPaymentEntry(FrappeTestCase):
 		# 'Is Opening' should always be 'No' for normal advance payments
 		self.assertEqual(gl_with_opening_set, [])
 
+	@change_settings("Accounts Settings", {"delete_linked_ledger_entries": 1})
+	def test_delete_linked_exchange_gain_loss_journal(self):
+		from erpnext.accounts.doctype.account.test_account import create_account
+		from erpnext.accounts.doctype.opening_invoice_creation_tool.test_opening_invoice_creation_tool import (
+			make_customer,
+		)
+
+		debtors = create_account(
+			account_name="Debtors USD",
+			parent_account="Accounts Receivable - _TC",
+			company="_Test Company",
+			account_currency="USD",
+			account_type="Receivable",
+		)
+
+		# create a customer
+		customer = make_customer(customer="_Test Party USD")
+		cust_doc = frappe.get_doc("Customer", customer)
+		cust_doc.default_currency = "USD"
+		test_account_details = {
+			"company": "_Test Company",
+			"account": debtors,
+		}
+		cust_doc.append("accounts", test_account_details)
+		cust_doc.save()
+
+		# create a sales invoice
+		si = create_sales_invoice(
+			customer=customer,
+			currency="USD",
+			conversion_rate=83.970000000,
+			debit_to=debtors,
+			do_not_save=1,
+		)
+		si.party_account_currency = "USD"
+		si.save()
+		si.submit()
+
+		# create a payment entry for the invoice
+		pe = get_payment_entry("Sales Invoice", si.name)
+		pe.reference_no = "1"
+		pe.reference_date = frappe.utils.nowdate()
+		pe.paid_amount = 100
+		pe.source_exchange_rate = 90
+		pe.append(
+			"deductions",
+			{
+				"account": "_Test Exchange Gain/Loss - _TC",
+				"cost_center": "_Test Cost Center - _TC",
+				"amount": 2710,
+			},
+		)
+		pe.save()
+		pe.submit()
+
+		# check creation of journal entry
+		jv = frappe.get_all(
+			"Journal Entry Account",
+			{"reference_type": pe.doctype, "reference_name": pe.name, "docstatus": 1},
+			pluck="parent",
+		)
+		self.assertTrue(jv)
+
+		# check cancellation of payment entry and journal entry
+		pe.cancel()
+		self.assertTrue(pe.docstatus == 2)
+		self.assertTrue(frappe.db.get_value("Journal Entry", {"name": jv[0]}, "docstatus") == 2)
+
+		# check deletion of payment entry and journal entry
+		pe.delete()
+		self.assertRaises(frappe.DoesNotExistError, frappe.get_doc, pe.doctype, pe.name)
+		self.assertRaises(frappe.DoesNotExistError, frappe.get_doc, "Journal Entry", jv[0])
+
 
 def create_payment_entry(**args):
 	payment_entry = frappe.new_doc("Payment Entry")