test: add custom TestCase class and use in stock

(cherry picked from commit 06fa35a9c1)

erpnext/tests/utils.py

@@ -2,6 +2,7 @@
 # License: GNU General Public License v3. See license.txt
 
 import copy
+import unittest
 from contextlib import contextmanager
 from typing import Any, Dict, NewType, Optional
 
@@ -12,6 +13,20 @@ ReportFilters = Dict[str, Any]
 ReportName = NewType("ReportName", str)
 
 
+class ERPNextTestCase(unittest.TestCase):
+	"""A sane default test class for ERPNext tests."""
+
+	def setUp(self) -> None:
+		frappe.db.commit()
+		return super().setUp()
+
+
+	def tearDown(self) -> None:
+		frappe.db.rollback()
+		return super().tearDown()
+
+
+
 def create_test_contact_and_address():
 	frappe.db.sql('delete from tabContact')
 	frappe.db.sql('delete from `tabContact Email`')