fix: Add tearDownClass()

(cherry picked from commit 4918e9533b)

erpnext/assets/doctype/asset/test_asset.py

@@ -25,6 +25,10 @@ class AssetSetup(unittest.TestCase):
 		create_asset_data()
 		frappe.db.sql("delete from `tabTax Rule`")
 
+	@classmethod
+	def tearDownClass(cls):
+		frappe.db.rollback()
+
 class TestAsset(AssetSetup):
 	def test_purchase_asset(self):
 		pr = make_purchase_receipt(item_code="Macbook Pro",