refactor(test): flaky post invoice test

erpnext/accounts/doctype/pos_invoice/test_pos_invoice.py

@@ -1002,9 +1002,10 @@ class TestPOSInvoice(ERPNextTestSuite):
 		se.cancel()
 
 	def test_ignore_pricing_rule(self):
+		frappe.set_user("Administrator")
 		from erpnext.accounts.doctype.pricing_rule.test_pricing_rule import make_pricing_rule
 
-		item_price = frappe.get_doc(
+		item_price = self.truncate_make_item_price(
 			{
 				"doctype": "Item Price",
 				"item_code": "_Test Item",
@@ -1012,7 +1013,7 @@ class TestPOSInvoice(ERPNextTestSuite):
 				"price_list_rate": "450",
 			}
 		)
-		item_price.insert()
+
 		pr = make_pricing_rule(selling=1, priority=5, discount_percentage=10)
 		pr.save()
 

erpnext/tests/utils.py

@@ -145,6 +145,13 @@ class ERPNextTestSuite(unittest.TestCase):
 			records = load_test_records_for(doctype)
 			cls.globalTestRecords[doctype] = records[doctype]
 
+	@classmethod
+	def truncate_make_item_price(cls, record):
+		frappe.db.truncate("Item Price")
+		item_price = frappe.get_doc(record)
+		item_price.insert()
+		return item_price
+
 	@classmethod
 	def make_presets(cls):
 		from frappe.desk.page.setup_wizard.install_fixtures import update_genders, update_salutations